﻿. *-. 



I70 NEW YORK STATE MUSEUM 



angular. The weak teeth parallel to the 



...•-^ w^, posterior end of the hinge are shown. 



■k l,: Varices of growth more widely spaced 



along the umbonal ridge than elsewhere ; 



Liopteria dawsoni nov. x 2. the finer lines being about evenly spaced 



Cape le Trou, Grindstone I. .. , 



except near the beak. 



Dimensions. Length of hinge (from back to posterior end, in 

 this case), 7.5 mm; length of umbonal ridge, 8+mm; height at 

 extremity of hinge, 6+mm; angle of umbonal ridge to hinge, 35 . 



Remarks. Though smaller, these specimens seem 

 to be the same species as the "Bakewellia 

 a n t i q u a " of the Dawson collection from Gay's 

 river, N. S. Neither our specimens nor the one 

 examined from the Peter Redpath Museum, Daw- ttqu&y Dawson, 

 son's collection, were seen to possess the vertical 

 cartilage pits of Bakewellia though they may possess them. Until 

 they are discovered I am inclined to refer the specimens to the 

 genus Liopteria. 



Liopteria acadica nov. 



Cast of left valve small, aviculiform, well inflated for this genus, 

 hinge shorter than the shell. Beak well elevated ; umbonal ridge 

 elevated and very oblique ; posterior margin obliquely sinuate, round- 

 ing regularly and rapidly into the convex pos- 

 terior ventral margin; ventral border sinuate 

 beneath the beak; anterior end of shell lobate, 

 the front sloping downward. Cast shows the 



Liopteria acadica r t> 



c a n °e V ie X Trou Grind- usua ^ varices and finer striae of growth 

 stone 1. common to these shells from this locality. 



Dimensions. Length of hinge, 7 mm; length of umbonal ridge, 



11 mm; greatest length of shell, 12 mm; angle of umbonal ridge to 



hinge, 25 . 



Pteronites cf. latus McCoy 



Pteronites latus McCoy. Carb. Foss. Ireland, p. 81, pi. 13, fig". 7, 



1844. 

 Pteronites latus Hind. Carb. Lam. p. 8, pi. 5, fig. 6, 7, 1901. 



Shell small, subtriangular, posterior end probably slightly sinuous. 

 Growth undulations are the only surface marks preserved on the 

 cast. Beak removed from anterior margin. The angle between the 

 hinge and ventral margin is about 35 , the length of the hinge, 11 



