1 6 The Ottawa Naturalist. [April 



says that "Salmon River" is an early term applied to the local 

 development of the Lorraine beds in New York. So that both in 

 Canada and the United States this species seems to occur at a 

 geological horizon immediately above the Utica shale. 



Trocholites Canadensis. Hyatt. 



Lituites {Trocholites) ammoneus, Salter. 1853. Quart. Journ. Geol. Soc. Lon- 

 don, vol. IX, p. 86; but not Trocholites amnioiiius^ 

 Conrad, 1838. 



Trocholites planorbiformis, Foord. 1891. Cat. Foss. Cephal. Brit. Mus. , pt. Ii; 



but not of Conrad (1842) nor of Hall (1847). 



Trocholites Canadensis, Hyatt. 1894. Ph3iog"eny of an Acquired Characteristic, 



in Proc. Amer. Philos. Soc,, vol. xxxii, p. 486, pi. 

 . IV, figs. 23 and 24; and pi. vi, fig^s. 39 and 40. 



" Loc, Falls of Montmorency, near Quebec. 



"The four specimens representing this species" {T. Cana- 

 densis) " came from the Bronn collection. They are similar to 

 T. amnionius in form, but differ in being broader proportionately 

 in the transverse diameters of the whorls and have deeper um- 

 bilici. The whorls are rounded, there being no tendency to angu- 

 larity, either of the sides or abdomen, and in these specimens the 

 size is small. There are fold-like costaefrom an early neanic state, 

 and the living chamber may be considerably over one-half of a 

 volution in length. The exterior is marked by longitudinal lines 

 along the venter and often on the sides, but these have none of 

 the regularity and prominence observable in Conrad's figure, and 

 that figure shows no costations which are more prominent and 

 fold-like in this than in T. ammonius or any other described 

 species of Trocholites'''' (Hyatt). These specimens, it may be added, 

 belong to the Museum of Comparative Zoology at Cambridge, 

 Mass. 



In 1901 Dr. H. M. Ami collected some interesting fossils 

 from the Trenton limestone at the Natural Steps, a little above 

 the Falls of Montmorency, and among them there are five good 

 specimens of a species of Trocholites, which have recently been 

 studied by the writer. They prove to be well preserved and very 

 characteristic examples of T. Canadensis, and are in all respects 

 essentially similar to the types of that species, which have been 

 kindly lent to the writer, for comparison, by Dr. W. Y. M. Wood- 



