A. Hyatt on the Beatricee. 261 
_ Arr, XXXT.—Remarks on the Beatricee, a new Division of 
Mollusca; by AtpHEus Hyatt, Jr. 
chain of small hollow chambers ; (2) a succession of concentric 
‘oniform layers ; (3) an external or sub-epidermal layer. 
(L) The central chambers are imperforate, generally deeply 
“Oheave, and set one upon another like a pile of Chinese tea- 
he t 
d toward the larger end of the fossil, and completely closed 
ty the bottoms of the succeeding cavities. They invariably 
_ Mtupy the axis of the encircling coniform layers, and have thin 
apy ning reversed, convex instead of concave, or broken 
a several minor chambers. Such irregularities, however, 
merely local, arising from mutilation or other disturbing 
i 1 
& ie any adequate acknowledgment of the kindness shown to the mem- 
p the expedition by Prof. 
