ORDER V CRINOIDEA—ARTICULATA 165 
Family 2. Marsupitidae. d’Orbigny. 
Base dicyclic. Dorsal cup large, composed of large, thin plates. Column absent ; 
represented by a thin pentagonal, (?) dorsocentral, or centrodorsal plate.’ Infrabasals 
five; basals five ; radials five ; interradials and anals wanting. Upper edges of 
radials furnished with a small crescent-shaped articular facet, having a perforated 
transverse ridge. Arms branching, uniserial, and traversed by dorsal canals. Struc- 
ture of tegmen and pinnules unknown. 
The only known genus is MJarsupites, Mantell, occurring in the Upper 
Cretaceous (White Chalk) of England and Northern Germany (Fig. 274). 

Fic. 274. 
‘ Fic. 275 
Marsupites testudinaris, Schlot. sp. Upper mee 
Cretaceous ; Liineburg, Prussia. «, Calyx, Uintacrinus Westphalicus, Schlit. Upper Cretaceous ; 
natural size; ), Radial, and a few of the arm- Recklingshausen, Westphalia. a, Calyx viewed from the 
plates ; c, Tips of the arms. side ; b, Inferior aspect. Natural size (after Schliiter). 
Family 3. Uintacrinidae. Zittel. 
Symmetry perfectly pentamerous, plates thin, column wanting. Base monocyclic ; 
basals five, enclosing a small, pentagonal, (?) dorsocentral, or centrodorsal plate. 
Costals two, the upper one axillary, and supporting two rows of distichals which are 
succeeded by palmars. Interbrachials numerous, the lowermost ring interposed 
between the costals. Arms long and pinnulate ; composed of very short, almost 
circular ossicles. Pinnules heavy and closely abutting; the lower ones united by 
sutures, and incorporated into the calyax. 
The solitary genus Uintacrinus, Grinnell (Fig. 275), occurs in the Upper 
Cretaceous of Kansas and Westphalia. 
Order 5. ARTICULATA. Johannes Miiller. 
(Neocrinoidea, Carpenter ; Pentacrinacea, Neumayr.) 
Tegmen coriaceous, studded with minute calcareous particles, or covered with well- 
defined small plates of irregular arrangement. Mouth and food-qrooves exposed ; orals 
1 [This plate is supposed by Carpenter to represent the distal plate of the stem, and not the 
proximal one.—TRANS. | 
