316 



Orthoceras Xerxes. (N. sp.) 



Description. — Shell rather large, annulated, gradually tapering ; section 

 apparently circular ; septa about six to the inch ; siphuncle cylindrical 

 about one-third the whole diameter of the shell, and either in contact with 

 the shell or nearly so. 



The specimen is distorted and, therefore, neither the section nor the 

 rate of tapering (apparently between one and two lines to the inch) can 

 be precisely ascertained. The annulations are broadly rounded, and the 

 intervening spaces broadly concave. The surface of the shell, as well on 

 the annulations as in the interspaces, is ornamented with sharp sub-imbri- 

 cating engirdling striae, about four in one line. 



Length of the specimen 8 inches ; diameter about 2 inches ; diameter 

 of the siphuncle 8 lines. 



Locality and Formation. — Phillipsburg, B 5, section Geol. of Can., 

 p. 8-1:4 ; Quebec group. 



Cdllector. — Dr. P. J. Farnsworth. 



Orthoceras Tittrus. (N. sp.) ? 



Remarks. — In B 2 were found some fragments of a large Orthoceras, 

 resembling 0. Xerxes in every respect, except that the shell is not annu- 

 lated. I propose the above name for it provisionally. It is closely allied 

 to 0. veloz {ante., p. 173). 



Cyrtoceras Aristides. (N. sp.) 



Description. — Shell small, slightly curved, greatest diameter at the last 

 septum, then slightly contracted towards the aperture, and tapering at the 

 rate of about four lines to the inch towards the apex ; septa thin closely 

 crowded, from six to eight in two lines ; surface and siphuncle unknown. 



Length of a specimen which is entire but imbedded 21 lines ; diameter 

 at last septum 7 lines ; depth of chamber of habitation 6 lines ; diameter 

 at the aperture a little less. 



Localiti/ and Formation. — Phillipsburg, B 2, section Geol. Can,, 

 p. 8-44. Quebec group. 



Collector. — E. Billings. 



