﻿2IO SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



rounded by a ring of marginal pieces. Pectinirhombs witb the 

 grooved recesses separated. Thecal plates generally sculptured with 

 pits " (p. 266). 



The family is subdivided by Jaekel into the following subfamilies : 



Glyptocystince, the oldest and most primitive forms, with a single 

 genus. Glyptocystitcs Billings. 



Apiocystincc, in which the ambulacra remain undivided, with 

 widely separated brachioles. It includes Meekocystis Jaekel (only 

 species Lcpocrinites moorei Meek), Apiocystites Forbes, Lepocrinites 

 Conrad, Jackelocystis Schuchert, Tetracystis Schuchert, and Halli- 

 cystis Jaekel. The last genus is referred by Jaekel to Callocystinse ; 

 the ambulacra, however, have not been seen, and in all the other 

 characters Hallicystis agrees with Apiocystites. 



Staurocystince, in which the ambulacra remain undivided, with the 

 brachials closely crowded. It includes Pseudocrinites Pearce, Tri- 

 mcrocystis Schuchert, and Staurocystis Haeckel. 



Callocystince has branching ambulacra, widely separated brachioles, 

 and partial telescoping of the second and third rings of plates. It 

 includes Callocystitcs Hall, Ccclocystis Schuchert, and Sphcerocys- 

 tites Hall. 



Subfamily Apiocystin^e Jaekel 



Callocystidse with the 4 or 5 ambulacra, simple, and relatively with 

 widely separated brachioles. 



Apiocystites Forbes 



Apiocystites Forbes, Mem. Geol. Surv. Great Britain, 11, pt. 11, 1848, pp. 



501, 503. — Hall, Nat. Hist. N. Y., Pal., 11, 1852, p. 242. — Jaekel 



(partim), Stammesgeschichte der Pelmatozoen, Berlin, 1, 1899, p. 279. 

 Apiocystis Haeckel, Die Amphorideen und Cystoideen, Beitr. Morph. u. 



Phyl. d. Echinodermen, Leipzig, 1896, p. 132. 

 Lepadocrinus Bather (partim), Treatise on Zoology, pt. in, Echino- 



derma, London, 1900, p. 61. 



Definition. — Apiocystinse with the theca regularly oval, elongate, 

 or slightly compressed (in the last case not strongly 4-sided), and 

 composed of 19 plates arranged as* follows : 



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



Second row has plates 5, 6, 7, 8, 9. 



Third row has plates 10, 11, 12, 13, 14. 



Fourth row has plates 16, 17, 18, 19, 15. 



Fifth vow lias deltoid 23. 



Deltoid 23 is very small, placed above plate 18, with the madre- 

 poritc and hydropore present. Anal area small, placed between 



