English: Title: Bulletin of the British Museum (Natural History)

Identifier: bulletinofbritis24muse Year: 1972 - 1973 (1970s) Authors: British Museum (Natural History) Subjects: Publisher: London : BM(NH) Contributing Library: Natural History Museum Library, London Digitizing Sponsor: Natural History Museum Library, London

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Text Appearing Before Image: FOSSIL AND RECENT COMATULID CRINOIDS WITH COELOMIC EXTENSIONS PENETRATING THE CENTRODORSAL Bv AILSA M. CLARK In 1877 Ludwig published an anatomical study of the dorsal or chambered organ and associated structures of Antedon rosacea (i.e. A. meditenanea (Lamarck)) made on sections of decalciiied material. He showed that there are five bhnd radial coelomic sacs extending from the coelom a short distance downwards (aboraUy) outside the chambered organ (see fig. 3j). On the oral (upper or ventral) face of intact centro- dorsals of Antedon there are five radial depressions to house the ends of these sacs, which depressions are lacking in the majority of recent comatulids.

Text Appearing After Image: Fig. I. a, b. ^Glenotremites paradoxus Goldfuss. B.M. Palaeontological Department reg. no. E.297, Upper Chalk, Gravesend, Kent, centrodorsal after ultrasonic cleaning in ventral (a) and dorsal (b) views, c, d. The same of Pterometra pulcJierrhna (A. H. Clark). B.M. Zoological Department reg. no. 1972. 8.21.100, 'Anton Bruun' st. 18A, 07°34'N: gS^oo'E (between Malaya and the Nicobar Islands), 77 metres The scale measures 5 mm. Bull. Br. Mtis. nai. Hist. (Zool.) 24, 9

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