420 

 CYRTOCERAS 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. 



Remarks. 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 2J 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. 186.) 



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. 



