808 STUART WELLER 
Ind., C. acanthus from Lockport, N. Y., C. cornutus from Racine, 
Wis., and Chicago, Ill., and C. vamifer from Tennessee. From 
the St. Paul beds in which C. deachlert occurs, Miller* has figured 
a specimen of Crypfodiscus. From the Racine beds, associated 
with C. cornutus the specimens illustrated in this paper were 
obtained. From Lockport, N. Y., and from Tennessee there is 
as yet no record of Cryptodiscus, but specimens may yet be found 
in these localities. The known localities for Cryptodiscus are 
Racine; Wis., Joliet, lily est. Raul ind: and jones; county,elas 
and in all these, with the exception of the last, the dorsal cups 
of Callicrinus are found associated with it. 
The correlation of Cryptodiscus as a genus with Callicrinus 
seems complete, but material has not yet been found by means 
of which the species of Cryptodiscus may be correlated with the 
species of Callicrinus described from the dorsal cup. 
The genus Cryptodiscus, founded by Hall, was never properly 
described, nor were the relationships of the fossils to which the 
name was applied, properly understood. D’Orbigny’s name, 
Callicrinus, also has priority over Hall’s, so it becomes necessary 
to drop Cryptodiscus entirely, and to refer all the specimens to 
Callicrinus. The different forms of disks doubtless represent 
distinct species of the genus, but there may be a difference of 
opinion as to whether species should be established upon the disk 
alone without a knowledge of the dorsal cup, and no names will 
be given to the Racine specimens for the present. 
STUART WELLER. 
THE UNIVERSITY OF CHICAGO. 
*Eighteenth Rep. Dep. Geol. and Nat. Rec., Indiana, p. 260, Pl. I, Fig. 7. 
