315 



pressure ; diameter at larger extremity about 10 lines, and at the smaller 

 about 5 lines ; the rate of tapering being thus about If lines to the inch ; 

 siphuncle f of a line in diameter ; depth of the chamber of habitation, so 

 far as preserved, 2 inches. 



Locality and Formation. — Phillipsburg, B 2, section Geol. of Can., p. 

 844 ; Quebec group. 



Collector. — Dr. P. J. Farnsworth. 



0. Catahne. (N. sp.) 



Description. — Shell short, annulated, curved ; chamber of habitation 

 slightly narrowed towards the aperture, greatest diameter at the last 

 chamber ; section apparently somewhat ovate ; septa from twelve to four- 

 teen to the inch ; siphuncle very slender, in contact with the shell on the 

 side of the convex curve ; annulations broadly rounded, slightly elevated, 

 about two lines distant from each other ; surface with fine thread-hke 

 engirdling striss. 



The length appears to be on an average from 4 to 6 inches ; greatest 

 diameter, at last septum, 9 lines ; depth of chamber of habitation about 

 18 lines. 



Resembles 0. Oato, but is distinctly annulated, and has more numerous 

 septa. 



Locality and Formation. — Phillipsburg, B 2, section Geol. of Can., 

 p. 844. 



Collector. — E. Billings. 



Orthoceras Sayi. (N. sp.) 



Description. — Shell short, rapidly tapering ; section elhptical, the' 

 diameters being in the proportions of nine to twelve ; tapering at the rate 

 of three lines to the inch in the lateral diameter, and about one and a half 

 lines in the dorsal ventral ; siphuncle cyhndrical, in contact with the shell ; 

 septa twelve to the inch. 



Surface with fine engirdling stride. The specimen is a little curved 

 towards the ventral side, in which respect only it differs from 0. servile, 

 which shows a tendency to curve in the opposite direction. 



Length of the specimen 3i inches. In 2 inches of the length it tapers 

 in the lateral diameter from 14 lines to 8 lines. 



Locality and Formation. — Phillipsburg, B 2, section Geol. of Can., 

 p. 844. 



Collector. — Dr, P. J. Farnsworth. ' 



