﻿242 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



In the Treatise on Zoology, Bather makes Staurocystis a synonym 

 of Lepocrinites (Lcpadocriniis), without, as the writer believes, 

 sufficient reason. In the latter genus the ambulacra are more de- 

 pressed and excavated into the thecal plates, are only half the length 

 of the theca, and have relatively fewer brachioles. In Pseudocrinites, 

 Staurocystis, and Trimerocystis the ambulacra are very conspicuous, 

 highly arched, as long as the theca (with one exception), and have 

 numerous brachioles. Added to these differences, the anal area in 

 Lepocrinites is bounded only by plates 7, 8, and 13, yet in the other 

 two genera these and plate 14 delimit this area. In Lepocrinites, fur- 

 thermore, plates 7 and 8 are shorter than in the other genera, allow- 

 ing plate 14 to enter the third circle, while in the others this plate 

 is a member of the fourth circle. 



Of Staurocystis but a single species is known, 5. qiiadrifasciatiis 

 (Pearce). This occurs in the Wenlock limestone and Lower Ludlow 

 of England. 



Subfamily Callocystin^e Jaekel 



Callocystidae in which the ambulacra bifurcate. Brachioles widely 

 separated. Thecal plates variously arranged, owing to the plates of 

 the higher rings shoving into the lower ones. 



Callocystitcs Hall 



Callocystites Hall, Nat. Hist. New York, Pal., 11, 1852, pp. 238, 248 — 

 Hall, ibidem, in, 1859, p. 151. — Jaekel, Stammesgeschichte der Pel- 

 matozoen, 1, Thecoidea und Cystoidea, 1899, p. 289. — Grabau, Bull. 

 N. Y. State Mus., ix, 1901, p. 151. — Grabau, Bull. Buffalo Soc. Nat. 

 Sci., vii, 1901, p. 151. 

 Callocystis Bather, Treatise 011 Zoology, in, Echinoderma, London, 1900, 



p. 62, text-fig. 31. 

 Antlwcystis Haeckel, Amphorideen und Cystoideen, Festschrift Carl 

 Gegenbaur, Leipzig, 1896, p. 132, pi. 3, figs. 23, 24. 

 Emended definition. — Callocystinse with the theca olive-shaped, the 

 oral end being more attenuated and bluntly pointed, while the base 

 is flat or truncated. Theca with 25 plates arranged as follows : 

 Basal row has plates 4, 1, 2, 3. 

 Second row has plates 5, (11), 6, 12, 8, 14, 9, 10. 

 Third row has plates 16, (11), 17, 18, 13, 19, 15. 

 Fourth row has deltoids 20, 21, 22, 23 double, and 24. Hydropore 

 and madreporite on the 2 parts of plate 23. The former is closed by 

 a pyramid. (See text-figure 35.) 



Anal area bounded by thecal plates 7, 8, and 13. Anal pyramid 

 composed of 5 or 6 plates and surrounded by a ring of many minute 

 pieces. 



