27 



a. Oentralkarret. b. Dets koagulerede 



Indhold. 

 Fig. 2. Tversnit af det femkamrede Organ, forstørret. 

 a. De vifteformige Skillevægge. b. Cen- 



tralkanalen. 



organet. 



c. ' Muskelfibre. d. Dorsal- 



3, Tversnit af to Tarmslynger, hvorimellem 

 Dorsalorganet ligger, forstørret. 

 a. Epitliel paa Dorsalorganets ydre Binde- 

 vævsvæg. h. Dorsalorganets Kjertelstruk- 

 tur. c. Epithelet i Blindsækken. d. Tar- 

 mens indre Epithelbeklædning. 



— 4. Tversnit af to Tarmslynger hoiere oppe, 



imellem hvilke Dorsalorganet ligger, for- 

 størret. 



a. Dorsalorganet. 6. En af de 5 Hoved- 

 stammer, som udgaa fra Dorsalorganet op 

 imod Mundskiven. c. En af de 5 Hoved- 

 stammer, der deler sig i to Grene, gaaende 

 hver til sin Arm. 



— 5. Tversnit af en Æggestok af Antedon peta- 



sus, forstørret. 



— 6. Det samme, stærkt forstørret. 



— 7. Længdesnit af en Testikel af Antedon pe- 



tasus, forstørret. 



a. Bindevævsforlængelser. 



— 8. Det samme, stærkt forstørret. 



a. Bindevævsforlængelser. b. Spermatogene 

 Celler, hvori Kjernen har delt sig i flere 

 sroaa, runde Legemer, c. Spermatozoer. 



— 9. Tversnit af det dorsale Nervesystems Cen- 



traldel. 



a. Dettes femkantede Ring. b. De 5 Hoved- 

 stammer, der bidrage til at danne Ringen. 

 - 10. Tversnit af det ventrale Nervesystems Cen- 

 traldel, forstørret. 



u, Serveringen om Svælget. b. Indre 

 Svælgvæg med sit Epitliel. 



— 11. Et Stykke af Nerveringen, omgivende Svæl- 



get, stærkt forstørret. 



fl.. Svælgvæggen med sit ydre og indre 

 Epitliel. b. Nervefibriller og Ganglier i 

 Nerveringen. c. En Gren, udgaaende fra 

 Nerveringen. 

 Tab. Y, Fig. 1. Tversnit af en Æggestok af Bathycrinus 

 Carpenteri, forstørret, 

 fl. Epithel. b, Follikeldannelse. 



— 2. Den samme, stærkere forstørret. 



a. Epithel. b. Follikeldannelse. c. Mu- 

 skelfibre. 



— 3. Længdesnit af en Testikel af Bathycrinus 



( 'arpenteri, forstørret. 



I 



a. The central vessel. 6. Its coagulated 

 contents. 

 Fig. 2. Transversal section of the five-chambered 

 organ, magnified. 



a. The flabelliform divisional walls. b. The 

 central canal. c. Muscle fibres. d. The 

 dorsal organ. 



— 3. Transversal section of two intestinal twist- 



ings, between which the dorsal organ is 

 situated, magnified. 



n. Epithelium on the outer connective-tissue 

 wall of the dorsal organ. b. Glandular 

 structure ol the dorsal organ. c. The epi- 

 thelium of the cæca. d. The internal epi- 

 thelial covering of the intestine. 



— 4. Transversal section of two intestinal twist- 



ings higher up. between which the dorsal 

 organ lies, magnified. 



«. The dorsal organ. b. One of the 5 

 chief steins that issue from the dorsal organ 

 up towards the oral disc. c. One of the 

 5 chief stems that divide themselves into 

 two branches, each passing to an arm. 



— 5. Transversal section of an ovary of Antedon 



petasus, magnified. 



— 6. The same, greatly magnified. 



— 7. Longitudinal section of a testicle of Ante- 



don petasus, magnified. 



a. Connective-tissue prolongations. 



— 8. The same. greatly magnified. 



fl. Connective-tissue prolongations. b. Sper- 

 matogenous cells in which the nucleus has 

 divided itself into several small round 

 corpuscles. c. Spermatozoa. 



— 9. Transversal section of the central portion 



of the dorsal nervous system. 



a. Its five-sided ring. b. The 5 chief stems 

 that contribute to form the ring. 



— 10. Transversal section of the central portion 



of the ventral nervoue system, magnified. 

 «. The nervous ring round the æsophagus. 



b. The inner æsophageal wall with its 

 epithelium. 



— 11. A portion of the nervous ring surrounding 



the æsophagus. greatly magnified. 

 a. The æsophageal wall with its outer and 

 inner epithelium. b. Nerve-fibrils and 

 ganglia in the nervous ring. c. A branch. 

 issuing from the nervous ring. 

 Pl. Y. Fig. 1. Transversal section of an ovary of Bathy- 

 crinus Carpenteri, magnified. 

 a. Epithelium. b. Follicular formation. 



— 2. The same, more powerfully magnified. 



«, Epithelium. b. Follicular formation. 



c. Muscle fibres. 



— 3. Longitudinal section of a testicle of Bathy- 



crinus Carpenteri, magnified. 



4 * 



