313 



ORTHOCERAS CATULUS. (N. sp.) 



Description. Shell of medium size, slender, very gradually taper- 

 ing, slightly curved, somewhat strongly annulated; section apparently 

 circular ; septa rather strongly concave, from 12 to 15 to the inch ; 

 siphuncle cylindrical, in contact with the shell, or nearly so. Surface 

 unknown. 



A specimen 7 inches in length is 10 lines in diameter at the larger 

 extremity, and 4 lines at the smaller. The siphuncle at the mid-length is 

 2 lines in diameter, but appears to become smaller towards the apex. 

 The annulations are about 3 lines distant from each other, but scarcely f 

 of a line in height ; the intervening spaces broadly concave. 



Closely allied to 0. repens, but has more distant septa. 



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

 p. 844 ; Quebec group. 



Collectors. P. J. Farnsworth, E. Billings. 



ORTHOCERAS PERSEUS. (N. sp.) 



Description. Shell of the medium size, elongate, very gradually taper- 

 ing ; septa about nine to the inch ; siphuncle small, cylindrical, in contact 

 with the shell. 



It is possible that the section of this species may be circular, but all the 



icimens, belonging to at least four or five individuals, are compressed 

 laterally, giving an elliptical section, of which the diameters are in the 

 proportion of about three to two. In all of them the siphuncle is situ- 

 ated, not on one of the broad sides, but on one of the narrow, rounded 

 edges. 



The species appears to have attained a length of about 18 inches, with 

 a diameter of about 1 J inches at the aperture. Diameter of the siphuncle 

 from 1| to 3 lines. 



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

 p. 844 ; Quebec group. 



Collectors. Dr. P. J. Farnsworth, E. Billings. 



