624 STUART WELLER 
aside from the specimens here described under the generic name 
Cibolocrinus, the only related crinoid with underbasals reduced to 
three in number is 7ibrachiocrinus from the same Australian beds. 
Cibolocrinus differs from the Australian Tribrachiocrinus only in the 
absence of the radianal plate from the calyx. 
The species recognized by Waagen in the Salt Range of India are 
somewhat similar to the Texas forms. ‘Two species described under 
the names Cyathocrinus indicus and C. kattaensis are clearly not 
members of that genus and should be referred to some genus, per- 
haps as yet undescribed, in the family Encrinidae. ‘They are very 
similar in general form to the turbinate species of Czbolocrinus from 
Texas, and are to be distinguished from them only in having the 
full quota of five underbasal plates. The plates from the same fauna 
described as Cyathocrinus goliathus are very like the similar plates 
of Phialocrinus americanus from Texas and those of P. princeps 
from Australia. 
DESCRIPTION OF SPECIES 
HYDREIONOCRINUS UDDENI Na. sp. 
(Plate I, Figs. 1-5) 
Description—Dorsal cup saucer-shaped, 42™™ in maximum 
diameter and 12™™ in depth. The base deeply excavated for the 
attachment of the column, all sutures of the calyx, except those 
between the underbasal plates, situated in groovelike depressions, 
the surfaces of the plates convex. The underbasal plates form a 
pentagonal disk 15™™ in diameter with a deep, central, circular 
depression with sides slightly converging toward the bottom, the width 
of the stem facet is 9.6™™, the width of the depression at its im is 
12.5™™, and the depth of the depression 3"™; the distal extremities 
of the underbasals, beyond the rim of the columnar depression, are 
short and convex or nodelike. The basal plates large, wider than 
high, the two anterior ones and the left posterior one uniform in 
size and shape, being pentagonal with the basal and two distal 
margins of nearly equal length, the lateral margins not more than 
one-third the length of the other margins; the outlines of the pos- 
terior and right-posterior basals are modified by the introduction of 
the large -adianal, these plates being in the main pentagonal, but 
