26 



NAUTILUS POMPONIUS. (N. sp.) 



Description The specimen on which this species is founded consists of 

 the first three whorls, the remainder to the aperture not preserved. These 

 are very compactly inrolled, and form a coil 3 inches across. The tube 

 rapidly expands in the transverse diameter, being at least 2 inches wide at 

 the completion of the third whorl while in the dorso-ventral diameter at 

 the same place it is only l\ inches. There are four septa to the inch on 

 the outside of the third whorl but the second whorl shows six or seven in 

 the same length. The siphuncle is 2 lines in thickness and with its centre 

 about three lines from the shell on the ventral or outer side of the 

 whorls. 



In this species the tube differs from that of any other known to me in 

 the lower limestones in its rate of expansion laterally; the transverse 

 section being oval and the lateral diameter being at least one fourth grea- 

 ter than the dorso-ventral. 



Locality and Formation. Phillipsburgh in the County of Missisquoi, 

 Canada East. In the upper part of the Calciferous formation. 



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



ORTHOCERAS MENELAUS. (N. sp.) 



Description. Shell of medium size, tapering at the rate of li lines to 

 the inch ; section transversely broad-oval or nearly circular ; septa from 

 10 to 12 to the inch where the diameter is from 10 to 15 lines ; siphuncle 

 cylindrical, excentric, between 2 and 3 lines in diameter where the shell 

 is from 10 to 15 lines, its centre distant from the margin about once and 

 a half its own thickness. Surface unknown. 



The transverse section appears to be broad-oval in all the specimens 

 that I have seen but I am not certain but that this feature is due to pres- 

 sure. The siphuncle is a cylindrical tube a little dilated where the septa 

 are attached to it and in most of the chambers (in the specimens observed) 

 slightly constricted between the septa. 



This species is allied to 0. Murrayi but differs therefrom in being more 

 nearly circular in the transverse section ; in having more numerous septa 

 and the siphuncle more distant from the margin. It seems to be rare. 



Locality and Formation. Wolfe Island near Kingston ; Pointe Claire 

 on the Island of Montreal, and the fifth and sixth lots in the ninth conces- 

 sion of the township of Tyendenaga. Black River limestone. 



Collectors. Mr. A. T. Drummond of Kingston, A. Murray and E 

 Billings. 



