124 



LAXD AND FRESH-AVATER SHELLS OF N. A. [PART IV. 



Fig. 231. 



Mr. Reeve's figure decidedly does not represent this sjje- 

 cies. The identity of Ocoeensis with tenebro cinctum, Antli., is 

 scarce]}- doubtful. 



66. P. hastatum, Anthony. 



Melania hastata, Axthon'Y, Ann. X. Y. Ljc, vi, p. 85, t. 2, f. 3, March, 1851. BiN- 

 NEY, Check List, No. 136. Brot, List, p. 31. Reeve, Monog. MeL, sp. 391. 



Description. — Shell conical, smooth, rather solid, dark chestnut, 

 spire rather obtusely elevated ; whorls 8-9 iu number, slightly convex, 

 with occasional delicate spiral striae, the upper ones sub- 

 cariuate ; body-whorl subcarinate, with a narrow j-ellovvish 

 band beneath the angle ; sutures moderately impressed, 

 yellowish; aperture small, pyriform, purple within; colu- 

 mella and outer lip much twisted together, forming a 

 broad, rather deep, reflexed sinus at base. 



Diameter, -30 inch (7^ millim.) ; length, -90 inch (23 

 millim.). Length of aperture -30 inch (Jh millim.). 

 Breadth of aperture -IG inch (4 millim.). 

 Habitat. — Alabama. 



Observations. — A fme symmetrical species, which seems to have no 

 affinities so close as to be easily confounded with any other. Its most 

 prominent characters, perhaps, are the nearly uniform diameter of the 

 two or three lower whorls, while above these the spire curves more 

 rapidly to the rather acute apex, and the dark purple aperture. 

 These two points will readily serve to distinguish it. — Anthony. 



Figured from Mr. Anthony's type. 



The habitat given above is probably erroneous as Mr. Antho- 

 ny's tablet is marked "Tennessee" and I have a number of 

 specimens collected by Prof. Haldeman in Holston River, S. 

 W. Virginia. I doubt if it be distinct from aratum, Lea, also 

 an inhabitant of the Holston. 



67. P. Lyonii, Lea. 

 Trypanostoma Lyonii, Lea, Proc. Acad. Nat. Sci., p. 155, May, 1863. 



Description. — Shell smooth, conical, greenish horn-color, without 

 bands ; spire somewhat raised ; sutures impressed ; whorls about six, 

 convex; aperture rather small, rhomboidal, whitish within; outer lip 

 acute, very sinuous; columella white, thickened below t.ud twisted. 



