258 



OlOTHOOERAS EXPLORATOR. (N. Sp.) 



Fig. 238. 



Pig. 238. — Orthoceras exploraior. a section shewing the siphuncle ; b side view of the 

 specimen. 



Description. — Section nearly circular, slightly flattened on the ventral 

 side ; tapering at the rate of about one line and a half to the inch ; septa 

 ahout twelve to one inch, where the diameter is from seven to eight lines, 

 gently undulated towards the apex on the ventral side ; siphuncle cylin- 

 drical, two lines in diameter where the diameter of the shell is eight lines, 

 situated at about one line or less from the shell on the ventral side. 

 ■Surface unknown. 



Locality and Formation. -^H, Pistolet Bay on Schooner Island, New- 

 foundland ; Quebec group. 



Colleetor. — J. Richardson. 



Grthocbras Priamus. (N. sp.) 

 a b 



Pig. 239. 



Fig. 239. — Orihoceras Priamus. a, section ; 6, side view of a fragment with the shell 

 preserved. 



Description. — Shell annulated, of medium size ; section circular ; 

 siphuncle cylindrical, very slightly, if at all, inflated between the septa, 

 its diameter between one-sixth and one-seventh the whole diameter of the 

 shell, near the centre ; septa from about five to eight to the inch ; an- 

 nulations narrowly rounded, with uniformly concave spaces between, 

 JSfteen in a length of two inches ; surface with fine thread-like, engirdling 

 strise, from eight to ten in one line, covering the annulations, as well as 

 the interspaces. 



