253 



ORTHOCERAS EXPLORATOR. (N. sp.) 

 b 



Fig. 238. Orthoceras explorator. 

 specimen. 



Fig. 238. 

 a section shewing the siphuncle ; 6 side view of the 



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 

 about 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. 



Collector. J. Richardson. 



ORTHOCERAS PRIAMUS. (N. sp.) 

 a b 



Fig. 239. 



Fig. 239. Orthoceras Priamus. o, 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, 

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

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

 the interspaces. 



