@article {107, title = {The development of Golfingia elongata Keferstein (Sipunculidea) with some remarks on the development of neurosecretory cells in sipunculids}, journal = {Arkiv F{\"o}r Zoologi}, volume = {13}, number = {23}, year = {1961}, note = {@ POORLY KNOWN; ONLY 6 SPP.; ONLY 3 / 13 GENERA. 5/6 DEVELOPMENT SIMILAR, DIFFERENCE IN AMOUNT OF YOLK; G. VULGARE \& G. GOULDI POOR IN YOLK. G.V. PROVIDED GOOD STUDY MATERIAL FOR FERT \& CLEAV (GEROULD 04 \& 07). P{\textquoteright}LION STROMBI DIFFERS BY HAVING A LECITOTROPHIC STAGE OF 30 DAYS, TWICE THAT OF G.V \& G.G. P.ST. MOST INTERESTING STRUCTURE IS SPECIEAL GLANDULAR EPIDERMAL ORGANS, SYMMET. ARRANGED IN 6 CIRCLETS W 4 ORGANS IN EACH CIRCLET (AKES, 58). IN G. MINUTA, ONLY KNOWN HERMAPH SIP, EGGS ENORMOUSLy rich YOLK \& LECITO. STAGE LASTS FOR 2 MONTHS. PRIMATIVE BROOD PROTECTION (AK 58). *THIS WAS INTRO - THOUGHT WAS ABST. SUMMARY 1. G. ELONGATA FOLLOWED FROM 1ST CLEAV. TO 21 DAYS. OLDER LARV \& JUVINILES COLLECTED FROM NORMAL BIOTOPE. 2. PRIMATIVE TYPE AS IN OTHER GOLFINGIA \& P.STROMBI. RICH IN YOLK BUT W ARCHENTERON. SWIM W METATROCH FOR 5 DAYS. 3. METAMORPH AT 48 HRS. EGG MEMB PERSISTS AS LARV. CUTICLE. THEN DEVELOP PROM. TERMINAL GLANDULAR ORGAN. CIRCLETS OF EPIDERMAL PAPIL FOUND IN LARV FROM SWEDISH WEST COAST BUT NOT FROM ROSCOFF. 4. *SEE F4 4. DEVEL OF APICAL ORGAN SPECIAL ATTENTION. THE LARV. CEREBRAL ORGAN COMES FROM DESCENDANTS OF THE ROSETTE CELLS. SURROUNDING MARGINAL CELLS FROM THE CEREBRAL GANGION. NO DEMARCATION BETW THESE 2 FOR A LONG TIME. 5. 2 INVERTED OCELLI FORMED FROM SUPERFICIAL CELLS OF APICAL PLATE. LATER EMBEDDED IN BRAIN. PERM. INVERTED EYES DEVELOPE INDEPENDENTLY IN JUVIN. 6. LARV. CER. ORG. SOON BECOME SECRETORY. WHEN BRAIN SEPARATES THESE SECRET. CELLS LIE WITHING BRAIN CAPSULE. RUNNIGN TO THE CENTRAL NEUROPILE. LATER THESE HAVE NO DEMONSTRATED SECRET. ACTIVI BUT IN S. NUDUS CELL GROUPS IN SAME POSITION FORM MOST PROMIN TYPE OF NEUROSEC. CELLS. *MAY WANT TO READ SOME OF THE DISCUSSION PART OF THIS* *MARG.L. ON TAPE; FROM INTERTIDAL ZOSTER AT ROSCOFF; SPAWN AT NITE; *SEE AKES.MON FOR REST OF THESE NOTES TAKEN OFF TAPE.}, pages = {511-531}, keywords = {cerebral organ, development, neurosecretion}, author = {{\r A}kesson, B.} } @article {108, title = {Some observations on Pelagosphaera larvae (Sipunculoidea)}, journal = {Galathea Report}, volume = {5}, year = {1961}, pages = {7-17}, keywords = {development, LARVAE}, author = {{\r A}kesson, B.} } @article {106, title = {A study of the nervous system of the sipunculoideae, with some remarks on the development of the two species Phascolion strombi Montagu and Golfingia minuta Keferstein}, journal = {Undersokningar over Oresund}, volume = {38}, year = {1958}, note = {@ SUMMARY: 1. WHERE WORK DONE 2. DEVEL OF P{\textquoteright}LION STROMBI \& G. MINUTA STUDIED. STROM VERY SIMIL TO G. VULG \& G. GOULDI - ALL PRIMITIVE; \& SIMILAR TO POLYCH. LONG BREEDING SEASON, GAMETES DEVEL IN COELOM, SPAWNING OF EPIDEMIC TYPE. EARLY CL. SPIRAL; EPIBOLIC GASTRUL.; EMBRY W 6 DAY PELAGIC STGE; DURING PELAG. STAGE THEY{\textquoteright}RE BOTTOM DWELLERS, NEVER FOUND IN PLANKTON; LECITOTROPHIC \& PELAG PH. FOR DISPERSAL ONLY. AT END OF PELAG, EGG MEMB > CUTICULA \& WITHIN THIS SHELTER THE PROTOTROCH DISOLVED \& YOLK FORCED INTO COELOM. AT SAME TIME FIRST CIRCLET OF EPIDERMAL ORGANS APPEAR. EVENTUALLY = 6 CIRCL; \& METAMERIC ARRANGEMENT (?) SAME AS IN G. ELONG.; HAVE DELECATE BRISTLES = CONDENSED SECRETION. DIR. DEV \& BROOD PROTECTIONS; LARV. EPI ORG. FORMED BUT NO BRIST \& RANDOM ARRANGM. 3. RETS \& CIRC. MUSCL DEVEL FROM ECTOMESOBLASTS. LONGI MUSCL FROM SOMATIC LAYER OF MESODERM SACS. VENT NRV CRD DELAMINATED FROM ECTODERM BEFORE CIRC. MUSC FORMED. CONNEC TISS \& PARANEURAL MUSC FROM MESOD SACS. V.N.C BEGINS AS UNPAIRED MEDIAN THICKENING. SECRE. FUNCT. THIS REDUCES LATER. 4. THESE 2 SPP COMPARED TO OTHERS 5. NERV. SYST OF 14 SPP IN 8 GENERA; SMALLER SPP W SIMPLER BRAINS, LARGER W MORE COMPLEX; IN SIPUNCULSU \& G. MINUTA BRAIN MOVED POST \& CONNECTED VIA CEREBRAL TUBE TO OUTSIDE; OTHERS W BRAIN IN CLOSE CONTACT WITH TENTAC.; CEREBR. ORG. WELL DEV IN SIP{\textquoteright}LUS ONLY. ?PERHAPS ONLY VESTIGE OF LARV. CER. ORG. EYES OF ADULT OF EVERSE TYPE - ECTODERMAL INFOLDINGS W SOLID CUTICULAR PLUGS IN S{\textquoteright}LUS, SMALL SPP (PRIM{\textquoteright}VE); IN MORE HIGHLY ORGANIZED EYES THE INNERMOST PART OF EYE IS DISTENDED \& FILLED W AMORPHOUS SECRETION. BEST DEV. EYES IS GOLF(GOLF) \& DENDROST. CYMOD.; THESE HAVE REFRACTIVE BODY IN INNER PART OF OCULAR TUBE. IN SIP{\textquoteright}LUS SECONDARY {\textquoteright}TENTACULAR{\textquoteright} EYES DEVEL; NUCHAL ORG. FOUND IN ALL; IN PHAS, ASP \& S{\textquoteright}SOMA ANT PRT OF V.N.C. CONNECTED TO SPEC. SENS ORG., POSSIBLY RUDIM STATOCYST. NEUROSECRET. IN ALL; PRODUCTS RELEASED INTO COELOM AND/OR POLIAN VESS; OTHERS INTO CENTRAL NEUROPILE. DIGITATE PROC. OF S{\textquoteright}LUS STORE NEUROSEC. PROD.; 6. V.N.C. MORPH {\textendash} NO METAM; LATERL. NRV.; PARAN MUSCL; SPEC. UNDIFFERENTIATED CELLS {\textquoteright}REGENERATION CELLS{\textquoteright} IN NRV. CRD.; WILL FORM ECTODERML PRT OF REGEN INTROV; IN S{\textquoteright}LUS TERM PRT OF VNC = TERM GANGL CONNECTS W SECRET. TERMINL ORG; SECRE EXTERNL (SEE AKES.MON)*}, pages = {1-249}, keywords = {development, histology, nervous, ORGAN SYST.}, author = {{\r A}kesson, B.} }