Raymond : Bkachioi'oda an'd r)siRAC0UA of the Chazv. 253 



few have four on the fold, three in the sinus, and two on the sides; an 

 occasional specimen has two on the fold and one in the sinus; and one 

 indi\i(lual shows a siniph' fold and sinus as in Camarella longirostris. 

 Locality. — This species is common at Crown Point, Valcour Island, 

 Plattshurgh. X'alcour, Chazy, and Cooperville, New York, and the 

 Mingan Islands. 



rill". OSTRACODA. 



In a pre\ious jiaiHT the writer described two new species of ostracods 

 from the Chaz>-, but did not figure them. The present brief note is 

 presented j^rincipally to give figures of three of the more common 

 species. The ostracod fauna of the Chaz>- is not a very large one, and 

 the specimens are not well preserved. Beside the four species enu- 

 merated in this paper, the collection contains representatives of a small 

 form with a long horn in the center of the \entral margin, and single 

 valves of three or four species of small, smooth shells. 



Genus Leperoitia Rouault. 



I. Leperditia limatula Raymond. 



Leperditia Ihnalida Raymond, 1905. American Journal of Science, Series 4, 

 Vol. XX, p. 380. 



Fig. 25. Leperditia UmaLula Raymond. Two photographs of the holotype^ 

 both larger than natural size. The second photograph and the one of Eiirychilina 

 below, are by Prof. George H. Hudson of Plattsburgh, N. Y. 



Description. 



"Shell of medium size, a little smaller than Leperditia fabiilites, 

 oblong in outline, higher bthind than in front. Hinge short, straight. 

 Anterior end regularly rounded. The posterior end slopes back almost 

 straight for a short distance, but is broadly rounded on the lower 

 posterior margin. The e\e tubercle is small, on some specimens sharp^ 



