334 Mr. F. A. Bather on British Fossil Crinoids. 



12. Ottaicacrinus. The view of Mr. Walter Billings may be correct, but 



mine is far simpler and equally probable. 



13. Carabocrinus. Suppl—a supplementary radianal or basal. 



14. Thenarocrinus caUipyge. Both genusand species are as yetundescribed, 



so that no opinions have been expressed ; the genus can be 

 recognized from the figure but not the species. I have, how- 

 ever, given the proposed specific name of the type for reasons 

 indicated under (1). 

 17. Euspirocrinus. Ciosterocrinus, Hall, is very doubtful but probably 

 allied to this. 



20. Cyathocrinus. Spharocrinus, if it be an independent genus at all, 



Streptocrhitis (W. &,S. = Ophiocriuus, Angelin), and Arachno- 

 crinus have the same structure in the anal area. 



21. Gissocrinus. Lecythocrinus, Miiller em. Zittel, appears to resemble 



this in dorsal cup. 



22. Achradocrinus. Hypocrinus Schneideri, Beyrich (" Ueber eine 



Kohlenkalk-Fauna von Timor," Phys. Abb. d. k. Ak. d. Wiss. 

 Berlin, 1864, pp. 83-84, pi. ii. figs. 10 «, b,c), appears to differ 

 from this only in having 3 IB instead of 5. 



23. Codiacrinus. The * marks the posterior interradius, and position of 



X . LeeythiocriuKs, White, is of the same structure, and is pro- 

 bably a synonym. 



24. Belemnocrinus, Holocriwus resembles this, but no anal plate has been 



described. It was probably present in youth and atrophied in 

 adult. 

 20. Poteriocrinus. The genera Scaphiocrinus, Scytalecrinus, Decado- 

 crintis, Woodoerinus, Codiacrinus, and Hydreionocrinus, while 

 differing in arm-structure and general form, have all a similar 

 structure in the anal area. PhUocrinus, de Kon., is probably a 

 Woodoerinus. 



27. Zeacrinus only differs slightly from Woodoerinus ; the depression of 



the dorsal cup produces a more curved outline of the anal plates. 



28. Mycocrinus. The grooves at the top are where the arms articulate. 

 iiO. Botryocrinus. Barycrinus, Vasocrinus, and Sicyocrinus have a similar 



structure in the anal area. In a few species the Radianal is 

 very small and may even become obsolete. 



31. Oncocrinus bucephalus. See remarks on (14). Cyrtidocrinus, Ange- 

 lin, is very doubtful, but seems like this. 



34. Cromyoerinus. The unstalked Ayassizocrinus has a similar arrange- 

 ment of anal plates. In Edriocrinus there are no IB ; B are 

 anchylosed ; X in line with R but narrower, supports a small 

 plate ; ventral sac unknown. 



30. Graphiocrinus. In Bursacrinus the Brachianal extends as in Phialo- 

 crimis, Trautschold non Eichwald (37), to the lower portion of 

 the costals. Synyphocrinus } Trautschold, is in AV. & S.'s opinion 

 a synonym of Bursacrinus. 



39. Eriso rinus. Stemmatocrinus only differs in that its IB are anchy- 

 losed into a single plate. Encrinus and Dadocrinus have as yet 

 shown no trace of any anal plate ; in other respects their dorsal 

 cup resembles that of Erisoerimts. 



