85 



0. Remus, n. sp. — The following are the characters and dimensions of 

 the only specimen of this species that has been collected : length 4 inches ; 

 tapering from 12 to 5 lines ; section circular ; siphuncle small not quite 

 central ; septa about 12 to the inch at the smaller extremity. Grimsby, 

 Niagara formation. J. Pettit. 



Genus Cyrtoceras. Goldfuss. 



Fig- 23. 



Fig. 2'^.— Cyrtoceras Corydon. 



Fig. 24.— " Clitus. 



C. Corydon, n. sp. — Shell rather strongly curved ; slightly constrict- 

 ed at the aperture ; gently inflated from the aperture for a little more 

 than one-third the length ; thence tapering and becoming gradually 

 slender towards the apex. Section transversely ovate in the anterior half, 

 and circular in the apical half. Siphuncle very small and close to the 

 shell in the median line of the ventral aspect. Length following the curve 

 on the ventral side about 35 lines ; in a straight line from the dorsal side 

 of the aperture to the apex 18 hues ; dorso-ventral diameter of the aper- 

 ture about 7 lines ; lateral diameter about 8 lines ; dorso-ventral diameter 

 at the first septum 9 lines ; lateral diameter 10 lines ; depth of chamber of 

 habitation 9 lines. Surface with obscure engirdling stride, and small irre- 

 gular constrictions of growth. Septa unknown. Grimsby ; Niagara for- 

 mation. J. Pettit. 



C. Clitus. — Shell gently curved, slightly constricted towards the aper- 

 ture ; section nearly circular. The siphuncle appears to be small, and very 

 near the shell in the median line of the ventral aspect. Septa unknown. 

 Surface with obscure engirdling stri^ and folds of growth. Length of the 

 specimen following the outer curve 26 lines ; dorso-ventral diameter at the 

 aperture 7 lines. The transverse diameter is a little greater in the anterior 



G 



