88 LAXD AND FRESH-WATER SHELLS OF N. A. [pART IV. 



the Cumiiigian collection — and in the present instance, the 

 locality may be questioned, as the species is rather of the 

 Tennessee type. 



29. P. subulare, Lea. 



Melania subtilaris. LEA, Pliilos. Trans., iv, p. 100, 1. 15, f. 30. Obs., 1, p. 110, 1. 15 

 f. 30. Kavenel, Cat., p. 11. DeKay, Moll. N. Y.. p. 92, t. 7, f. 138. Wheatley, 

 Cit. Shells U. S., p. 27. Jay, Cat., 4th edit., p. 27.5. BiNXEY, Chock List, 

 No. 2.'J7. BiiOT, List, p. 3."). Reeve. Monog. Melania, sp. 428. Whiteaves, 

 Can.iil. Naturalist, viii, p 102, April, 18(>3. 



Ccriphasia sxibularis, Lea, Adams, Genera, i, p. 287. 



Description. — Shell elevated and acutely turreted, horn-color ; apex 

 acute ; whorls about twelve, flat, carinate on the middle of the body- 

 whorl : base augulated ; aperture white and one-fourth the 



Fig. 10/ . 



length of the shell. 



Habitat. — Niagara River. 



Diameter, -4; length, 1-3 inches. 



Obsei'vations. — I took this species at the Falls of Niagara, 



and being unable to refer it to any described species, have 



given it a place here. It resembles the Virginica (Say), but 



differs greatly in elevation, the Virginica having about seven 



whorls only. The carina causes the whoi'ls to be flatter in the subii- 



laris. In some specimens the columella is purple. — Lea. 



This is one of our most beautiful species ; the clear, polished 

 surface is quite translucent, banded below the sutures by yellow 

 and light blue. It appears to be a common species in the 

 great lakes and their tributaries. 



Fig. 167 is a copy of Mr. Lea's. 



The species is reported from St. Lawrence River, by Mr. 

 Whiteaves. 



29 a. P. intensum, Anthony. 



Melania interna, Anthony, Reeve, Monog. sp. 371. Brot, List, p. 30. 



Description. — Acuminated, purple-black, whorls ten, flatly convex, 

 encircled with a keel above the sutures, last Avhorl slightly angled 

 and ridged at the base ; aperture rather small, purple-black. 



Anthony. MSS. in I\Ius. Cuming. 



Habitat. — United States. 



A very characteristic purple-black shell, encircled by a keel so near 

 to the suture as to give them an appearance of being more than 

 usually excavated. — lieeve. 



