Ravmon'd : Brachiopooa and Ostracoda of the Chazv. 217 



Cli'iiiis l.iN(,ri,A l^rujiuiLTC. 

 2. Lingula brainerdi Ra>mond. 



(I'latc XXXIII. figure 2.) 



Lingula brainerdi Raymond, 1902. Bulletin American Paleontology, \'()I. III. 



p. 302. PI. 18, figs. 2, 3. April. 1902. 

 Lingula liinilaris Seely (nomen nudum), 1902. Report of Vermont State Geologist. 



new series, Vol. I, p. 145. December, 1902. 

 Lingula limitaris Seely, 1906. Report of Vermont State Geologist, new series, 



\'ol. y. p. 183, PL. XLI. Reprint of same, p. 30. PI. XLI. 



This Lingula is the commonest and often the only fossil found in 

 the sandstone at the base of the Chazy at Valcour Island, Isle La 

 Motte, South Hero, and Crown Point. The Lhigulce are very abun- 

 dant, but the sandstone is so hard that it is only rarely that good speci- 

 mens are obtained. At the time the original figures of this species 

 were made, only very fragmentary specimens were at hand, but before 

 the description was drawn up, better specimens were obtained, and a 

 figure of one of them is given here. 



Description. 



Shell moderately convex, sub-rectangular, with three flat slopes, 

 one to each of the sides, and to the front. The anterior margin is 

 nearly straight in the middle, but rounded at the angles. The pos- 

 terior margin is regularly rounded. The surface is marked b\' nu- 

 merous concentric lamella?, and, when partially exfoliated, the shell 

 shows numerous radiating lines on the middle of the valve. 



This species differs from Lingula hiironensis in that the front slope 

 begins in the middle of the valve instead of at the beak; in the more 

 rounded posterior margin, and in the absence of the longitudinal 

 undulations. It is, however, a related species. From Lingula 

 lyelli it differs in being much broader in proportion to the length, 

 and more rounded at the apex. 



An average specimen is 16 mm. long, and 11. 5 mm. wide. A small 

 one is 8.5 mm. long and 6 mm. wide. 



Locality. — This species is common in the sandstone at the base of 

 the Chazy at Valcour Island and Crown Point, New York, and at 

 South Hero and Isle La Motte, Vermont. The cotypes are in the 

 collections at Cornell University. 



