216 Annals of the Carnegie Museum. 



writer has been conservative in naming the species. Further work 

 with larger collections will probably add several more species. At 

 least two more than have been described are indicated by specimens 

 in Professor Hudson's collection. 



I wish to express my thanks to Professor George H. Hudson for 

 the loan of many fine specimens, and I must not fail to mention the 

 kindness of the late Dr. J. F. Whiteaves in sending me many of the 

 types preserved in the Museum of the Geological Survey of Canada. 

 Dr. E. O. Hovey was so kind as to loan the types of Orthis costalis, 

 and I have consulted freely with Professor Charles Schuchert on many 

 points. The drawings are by Mr. Sydney Prentice, and the photo- 

 graphs, with three exceptions, are by Mr. Louis Coggeshall. 



Sub-Kingdom MOLLUSCOIDEA. 



Class BRACHIOPODA. 



Order Atremata Beecher. 



Family LINGULID.'E Gray. 



Genus Glossina Phillips. 



I. Glossina belli (Billings). 



(Plate XXXIir, figure I.) 

 Lingida Belli Billings, 1859. Canadian Naturalist and Geologist, Vol. IV, p. 431, 



figs. 7, 8. 

 Ltngula Belli Billings, 1863. Geology Canada, p. 124, fig. 47. 



Shell of fair size, roughly triangular, and nearly as broad as long. 

 Both valves rather strongly convex, the greatest convexity a little 

 behind the center. The pedicle valve has a longitudinal ridge or 

 keel which extends from the beak to about the middle of the shell. 

 From this ridge the sides slope rather steeply and are flat or sometimes 

 concave. The front slope is more gradual, and is gently convex. 

 The front is regularly rounded, the sides nearly straight, for about 

 two-thirds their length, and meet at an angle of about 75°. The 

 surface of the shell is very smooth, and is marked only by faint and 

 distant concentric lines of growth. There are no radial striae to be 

 detected even on partially exfoliated shells. 



Locality. — This is a rare species, so far found only in the Upper 

 Chazy at Valcour Island, New York, and at a higher horizon in the 

 Ottawa valley. The plesiotype is in the Carnegie Museum. 



