I/O NEW YORK STATE MUSEUM 



angular. The weak teeth parallel to the 

 posterior end of the hinge are shown. 

 \'arices of growth more widely spaced 

 along the umbonal ridge than elsewhere ; 

 Liopteria dawsoni nov. x 2. the finer Hnes bcine about evenly spaced 



Cape le Trou, Grindstone I. ^ tr 



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 *' B a k e w e 1 1 i a 

 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- ■^t?qur;'''DawsJn. 

 son's collection, were seen to possess the vertical ^^^'^ "^^^' ^'- s- 

 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, avicuHform, 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, 

 Liopteria T^dica ^^^ frout slopiug downward. Cast shows the 

 Cap7ie''T;ou. Grind- ^^^^^ variccs and finer striae of growth 

 ^*°"^^' common to these shells from this locality. 



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

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

 hinge, 25°. 



Pteronites cf. latus McCoy 



Pteronites latus McCo3\ 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°, tlie lengtli of tlie hinge, n 



