288 NEW YORK STATE MUSEUM 



Dimensions. One brachial valve, virtually uncompressed, has a 

 diameter of 57 mm and its original hight was about 35 mm. 

 Another which has undergone compression apparently had a di- 

 ameter of about 65 mm. A pedicle valve has a diameter of 45 mm.. 



Lower Devonic. Grande Greve and Perce rock, P. Q. 



Lingula elliptica nov. 



Shell of moderately large size, outline elongate and regularly 

 elliptical, there being for the dorsal valve very little difference in 

 the curvature of the umbonal and distal extremities, the latter being 

 very slightly transverse, the former quite regularly curved. Sides 

 direct, for a very short distance only partaking of the curvature of 



Lingula elliptica 



the rest of the outline. Surface low and evenly curved, margin 

 bordered all the way round by a narrow flattened area ; exterior 

 marked by concentric lines of the usual style. On the interior of 

 the dorsal valve is a long and low median ridge or septum, but in 

 the ventral valve there is no such feature. Length 19 mm, width 

 10 mm. 



Lower Devonic. Grande Greve and Perce rock, P. Q. 



Glossina acer nov. 



Shell of relatively large size, subtriangular, with acute and prom- 

 inent beak from which the margins diverge rapidly for more than 



Glossina acer 



two thirds the length of the shell, the distance across the pallia! 

 surface being four fifths the length of the shell. Anterior margin 

 broad and nearly transverse. Surface covered by sharply elevated 



