256 

 PiLOCERAs Canadense. (Billings.) 



p. Canadense. (Billings.) Can. Nat. and Geol., vol. t, p. 171. 



Hemarks. — Several specimens of the siphuncle of this species were 

 collected at Cape Norman and Port aux Choix, in divisions F and G. 

 In Canada it has been found only in the Calciferous formation. 



PiLOCERAS WORTHENI. (N. Sp.) 



Fig. 240. 



Pig. 240. — Piloceras Worlheni. The central figure is a longitudinal section, a, the 

 cavity, and 6, the solid part of the siphuncle ; c, side, and d, rentral view of a detached 

 siphuncle. 



Description. — Siphuncle nearly straight, from two to four inches in 

 length ; tapering at the rate of two and two-thirds lines to the inch, for 

 two inches from the larger extremity in a specimen two and a half inches 

 in length, then more rapidly to the apex ; septa from eight to twelve in 

 one inch ; section broadly elliptical, the dorso-ventral diameter about one- 

 fifth greater than the lateral. The septa cross the sides obliquely, sloping 

 towards the aperture, in proceeding from the dorsal to the ventral side. 

 Surface unknown. 



One of the specimens shews that on the ventral side, the siphuncle is in 

 contact with the shell. Another specimen, a longitudinal polished section 

 of which is represented by fig. 240, shews that at two inches from the 



