255 



Tlie only difference between this species and 0. Biysbyi is, thatrin 

 the latter the siplmncle is in general a little more than half the whole 

 diameter, whereas in this species it is less than one-half. 



Locality and Formation. I, Point Rich, M, Table Head, Newfound- 

 land ; Quebec group. 



Collector. J. Richardson. 



ORTHOCERAS LAMARCKI. (Billings.) 



LAMARCKI. (Billiugs.) Can. Nat. and Gcol., yol. iv, p. 362, Oct. 1859. Geol. Can., 



p. 121, fig. 38. 



Remarks. This species, or a very closely allied variety of it, occurs 

 abundantly, in silicified fragments at Cape Norman, in Division G, at 

 Pistolet Bay, on Schooner Island, in Division H, and at the River of 

 Ponds, in Gr, Newfoundland. It resembles 0. Priamus, but is more 

 nearly cylindrical, the rate of tapering being on an average about one line 

 to the inch. The siphuncle is stated in the original description, to be full 

 one-third of the whole diameter, but in the majority of the specimens from 

 Newfoundland it is about one-fourth. I would classify these, from this 

 locality, as a distinct species, were it not that among them there is one 

 with the siphuncle full one-third the whole diameter, and several with it 

 between one-fourth and one-third. 



ORTHOCERAS FLAVIUS. (N. sp.) 



Description. Shell of medium size ; section apparently circular ; 

 siphuncle cylindrical, in contact with the shell ; septa from nine to 

 thirteen to the inch. Surface and rate of tapering unknown. 



The best preserved specimen is 3 inches in length, about 9 lines in 

 diameter at the smaller extremity, and 10J lines at the mid-length, 

 shewing a rate of tapering of about 1J lines to the inch. The specimen, 

 however, is distorted by pressure. The siphuncle is 3 lines in diameter 

 in the lateral direction, and 2i in the dorso-ventral. It is nearly of the 

 same size throughout. There are 10 septa to the inch. Another 

 siphuncle of the same length, is 4 lines in diameter at the larger, and 3 

 lines at the smaller extremity. It has 13 septal rings to the inch. 



0. explorator has the siphuncle not in contact with the shell, and one- 

 third smaller, but in other respects resembles this species. 



Locality and Formation. I, Point Rich, Newfoundland : Quebec 

 group. 



Collector. J. Ri chardson . 



