142 ECHINODERMATA—PELMATOZOA SUB-KINGDOM TIT 
highly elevated. Arms heavy; branching in the free state. Anus borne at 



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Fic. 243. 
A, Actinocrinus proboscidialis, Hall. Sub-Carboniferous; Burlington, Iowa. Calyx with fractured tegimen, 
showing the subtegminal ambulacral skeleton, and the convoluted digestive organ. 4, Diagram of Doryerinus. 
C, Natural cast of tegmen of Physetocrinus, with impressions of food-grooves (a), conducting from the arms to 
the mouth (0); an, Anus. D, Enlarged portion of the ambulacral skeleton (after Meek and Worthen). 
the end of a short, stout, spinous tube. Lower Sub-Carboniferous ; North 
America and Europe. 
Teleiocrinus, W. and Sp. Arms closely crowded, and forming a broad con- 
: tinuous flanging rim around the calyx. Anus at the 
upper end of a long tube. Upper Burlington Limestone. 
Stequnocrinus, Meek and Worth. Burlington Lime- 
stone. 
Physetocrinus, M. and W. Arms crowded ; the arm- 
bases projecting in a rim, which is interrupted along the 
interrays. Anus in the form of a circular opening 
through the tegmen. Lower Sub-Carboniferous ; North 
America, England, and Belgium. 
Strotocrinus, M. and W. Arms crowded ; the upper 
part of the dorsal cup produced in an immense rim, 
which is horizontally directed, and is composed of higher 
orders of brachials. 'Tegmen flat ; composed of innumer- 
able minute pieces. Anus in the form of an opening 
through the tegmen. Restricted to the Upper Burlington 
Limestone. 
(SECTION B.) BATOCRINIDAE. 
Batocrinus, Cassed. (Fig. 244). Similar in form to 
Actinocrinus, but calyx plates without  sculpturing. 
FR hexagonal or heptagonal. First costals quadrangular, 
ae eee always shorter than the /’, and transversely arranged. 
Batocrinus pyriformis, Db “ St eben > Phe oP ee nia 
Shumard sp. Sub-Carbonifer- RA of the same size as the /. Interradials rarely more 
ous ; Burlington, Iowa. Nat. than three, and arched over by the palmars and higher 
size (after Meek and Worthen). 3 ¥ ‘ 
brachials, when these are present in the calyx, so as to 
he completely shut off from the plates of the tegmen. Tegmen elevated ; its 

