210 



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



Fig. 417. 



95. G. Clarkii, Lea. 



Melania Clnrkii, Lea, Philos. Trans., x, p. 297, t. 30. f. 4. Obs., v, p. 53. BixxEY, 

 Check List, No. 50. Brot, List, p. 34. Reeve, Monog. Melauia, sp. 356. 



Description. — Shell folded, club-shaped, rathei' thin, dark brown; 

 spire elevated, drawn out; sutures somewhat impressed; whorls 

 flattened ; aperture small, rather elliptical, at the base angu- 

 lar, within dark ; columella twisted. 

 Habitat. — Duck Creek, Tennessee. 

 Diameter, -23 ; length, -73 of an inch. 



Observations. — The form of this species is more attenuate 

 than usual, with the clavate forms. It has about ten whorls ; 

 those above the body- whorl being disposed to be both plicate 

 and striate. Towards the apex they are all thickly striate. On all 

 the specimens before me, on the lower whorls, there are irregular, 

 oblique strire, somewhat similar to those on the M. Ocoeensis (nobis), 

 wiiich give them a mallcate character. On the upper margin of the 

 whorls, along the sutures, there is usually an indistinct, light line. 

 The outer lip is broken. — Lea. 



Figured from Mr. Lea's plate. Specimens before me differ 

 somewiiat in tlie closeness of the plicas. Some are even more 

 attenuately lengthened than Mr. Lea's figure. This is the 

 narrowest species inhabiting North America. In collection 

 of Mr. Gould are specimens from Lee Count}*, Georgia. 



96. G. De Campii, Lea. 



Goniobasis De Campii, Lea, Proc. Acad. Nat. Sci., p. 154, May, 1863. 



Description. — Shell plicate, striate below, greatly attenuated, thin, 

 corneous, without bauds ; spire subulate ; sutures linear, Fig. 418. 

 impressed ; whorls fully ten, subcouvex, above with slightly 

 bent plioaj ; aperture very small, subrhomboidal, whitish 

 within ; lip acMte, somewhat sinuous ; columella whitish, in- 

 curved and twisted. 



Habitat. — Huntsville, Alabama; Wm. H. De Camp, M.D., surgeon, 

 United States army.—iea. 



