Scalaria Albensis of d'Orbigny, Pictet and Campiche's monograph on the 

 Cretaceous fossils of the environs of Ste. Croix was not accessible to the 

 writer. Both it and the specimen collected by Mr. Richardson are prac- 

 tically indistinguishable from Pictet and Campiche's figures of /S. Clemen- 

 tina, and would now seem to be referable to that species rather than to 

 S. Albensis. 



Pleurotomaria Skidegatensis. 



Pleurotomaria Skidctjatensis, Whiteaves. 1876. This volume, pt. 1, p. 51, pi. 9, figs. 6 

 and 6 a. 



East end of Maud Island, a specimen with part of the test preserved ; 

 and south side of AUiford Bay, a large cast of the interior of a shell, 

 which is probably referable to this species ; both collected by Dr. New- 

 combe in 1895. 



Pelecypoda. 

 Anatina (Cercomya) semiradiata. (N. Sp.) 

 Plate 37, fig. 4. 



Shell strongly compressed, transversely elongated, more than twice as 

 long as high, straight, or at least not distinctly curved. Anterior side 

 shorter, a little broader (in the direction of its height) and more broadly 

 rounded at the end than the posterior ; beaks appressed and depressed, 

 placed in advance of the midlength. 



About one-third of the distance from the front margin to the posterior 

 exti'emity th?re is a faint transverse groove or narrow depression in the 

 cast of each valve. In front of this groove the surface is concentrically 

 and coarsely plicated. Behind it the concentric plications are more 

 feebly developed, and immediately next to it there is a broad submedian 

 triangular area, marked also with fine radiating ridges. But no vestige of 

 the test is preserved in either of the only two specimens that the writer 

 has seen, so that the hinge dentition is unknown. The muscular im- 

 pressions also are not preserved. 



East end of Maud Island, a tolerably well preserved and nearly perfect, 

 but slightly distorted cast of the interior of both ^ alves ; and south side 

 of Alliford Bay, a siiuilar, but rather larger, less perfect and worn cast ; 

 both collected by Dr. Newcombe in 1895. 



A very similar shell to the recently described Anatina (Cercomya) 

 punctata, Stanton,* of the Jurassic rocks of the Yellowstone National 

 Park. 



*Greology of the Yellowstone National Park. Monograph xxxn of the United States 

 Geological Survey (1899), p. 628, pi. 74, fig. 5. 



