420 



Cyrtocbras Juvenalis. (^Ante, p. 177.) 



Fig. 400. 



Fig. 400. — Cyrtoceras Juvenalis. — a, side view of a nearly perfect specimen; 

 b, ventral view of the original, showing the surface characters. 



Memarks.— -Since the description of this species was printed, Mr. J. F. 

 Whiteaves has discovered a nearly perfect individual, in the Trenton lime- 

 stone near Montreal, which is figured above. 



The specimen is 2i inches in length measured along the outside, and is 

 curved to a radius of about 11 lines. It tapers, in the lateral diameter, 

 from 8 lines to 3, and, in the dorso ventral, from 9 to 3 lines. Near the 

 mid-length a number of the septa are well preserved, — 6 in 4 lines mea- 

 sured on the side, and 7 in 6 lines on the median line of the ventral aspect. 

 There appears to be a constriction near the aperture. 



Clisospira curiosa. (^Ante, p. 1 86.) 



Fig. 401. 



Fig. 401. — A portion of the spire of C. curiosa, which retains the shell and 

 surface markings. 



Remarks. — Among the specimens of this species lately collected by 

 T. C. Weston is one which retains a part of the shell. The surface is 

 beautifully reticulated by ascending and revolving lines as above repre- 

 sented. 



