Fossils of the Calciferous SandrocTc. 363 



ORTHOCERAS MONTREALENSIS, (N. S.) 



Fig. 11. — c, d, e. 



Description. — Section circular, smooth, tapering at the rate of 

 about one line to the inch : septa very convex, eighteen or twenty to 

 the inch at a diameter of eight lines; siphuncle cylindrical mar- 

 ginal seven sixteenths the whole diameter of the shell surface 

 unknown. 



Locality and formation. — Near the village of St. Eustache, 

 Calciferous Sand rock. 



Collectors. — J. Richardson, A. Murray. 



ORTHOCERAS MULTICAMERATUM ? (Conrad.) 



Fig. 11.— 6. 



Several siphuncles have been collected in the Calciferous Sand- 

 rock at the Mingan Islands, which appear to be of this species. 

 Specimens with the shell and septa preserved, occur at the same 

 locality in Chazy limestone immediately overlying the rocks in 

 which these siphuncles were collected. 



ORTHOCERAS DEPARCUM, (N. S.) 

 Fig. 11.— I. 



Description. — Section circular smooth, tapering about half a 

 line, and with thirty-two septa to the inch at a diameter of five 

 lines. Siphuncle unknown. 



This species tapers more gradually thau 0. Montrealensis and 

 lias the septa more approximated. 0. primigeninm, Conrad, is 

 an allied species but with about forty septa to the inch according 

 to the figure in the Palaeontology of New York. 



Locality and formation. — Mingan Islands, White Limestone. 



Collectors. — Sir W. E. Logan, J. Richardson. 



ORTHOCERAS SORDIDUM, (N. S.) 

 Fig. 11. — i, k. 



Description. — Cylindrical, apparently a little curved ; septa 

 convex about twenty to the inch at a diameter of half an inch ; 

 siphuncle marginal a little less than one third the diameter of the 

 whole shell. 



Resembles 0. Montrealensis but is a more slender species and 

 has the siphuncle smaller. 



