no NEW YORK STATE MUSEUM 



Cyclonema montrealense Billings 



PL 7, fig. 7 



The gritty sandstone bed of the Snake Hill formation at Snake 

 hill has afiforded the impression of a small Cyclonema which has the 

 characters of C. montrealense from the Trenton lime- 

 stone of the island of Montreal. It agrees especially with that 

 species in having the whorls " moderately ventricose, most promi- 

 nent in the lower half," a rather deep suture, in the character of 

 the spiral lines, of which there are about ten in 4 mm with one or 

 two smaller ones between each pair of the larger lines. The spire 

 is somewhat higher than Billings's description (title 4, page 30) and 

 figure require, but since Ulrich (title 39, page 1059) after an ex- 

 haustive study of the western Cyclonemas states that the relative 

 height of the spire is a very unreliable character, and that the form 

 of the whorls is a better character, but that the surface markings 

 have served him best of all in separating the various species, we do 

 not feel warranted in attaching much importance to this difference 

 in the spires. 



Cyclonema cushingi nov. 



PL 7, fig. 8-10 ||, 



We had repeatedly observed fragments of a gigantic Cyclonema in 

 the Shake Hill beds at Snake hill, but owe the fairly perfect speci- 

 men here figured to the collecting spirit of Prof. H. P. Cushing to 

 whom we gladly dedicate this species in recognition of the fact that 

 he does not disdain to be interested in fossils. 



The specimens at hand are too badly crushed to allow a descrip- 

 tion of the species, but since the form is obviously closely allied to 

 C . h a g e r i Billings (1865, page 29), a Trenton form from Mon- 

 treal island, it seems best to define this new species with the latter 

 by determining its differences from the Canadian relative. The 

 Snake Hill type has in common with the latter the large size and 

 the number of whorls (about four). Also the form of the volutions 

 appears to agree, the upper ones being rather flat or somewhat de- 

 pressed in the middle, while it is not certain, whether the last volu- 

 tion was as ventricose as in C . h a g e r i , or became concave in 

 the type specimen through being crushed. We believe the latter on 

 account of the presence of the oblique folds and a protruding lower 

 rim in the specimen which indicate a former greater expansion of 

 that volution. The apical angle is apparently less than in the other 



