118 



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



Fig. 223. 



Observations. — There were eight specimens of this species submit- 

 ted to my examination by Mr. Clark, of Cincinnati. In general out- 

 line and size, it very closely resembles M. Warderiana (nobis), but 

 differs from the specimens of that species which have come 

 under my notice in not being cariuate, and in having a more 

 twisted columella. The apices of the individuals now before 

 me are slightly eroded, and the number of the Avhorls may be 

 seven or eight. One of the specimens has small folds near 

 the apex, decussating striae. The inside is bluish-white, one 

 of the specimens having a brown mark at the columella. 

 The aperture is nearly one-half the length of the shell. Over the 

 whole surface there are small, irregular ridges. The body-whorl is 

 very long. — Lea. 



This species differs from all the others of this group in the 

 great acumination of the upper part of its spire. In young 

 shells (in which state only, the spire is perfect) the spire is 

 narrowly subulate for the first few whorls, then suddenly 

 expands into a bulbous form. 



58. P. strigosum, Lea. 



Melania strigosa, Lea, Philos. Proc, ii, p. 13, Feb., 1841. Philos. Trans?., viii, p. 

 175, t. 5, f. 24. Obs.iii, p.131. DeKay, Moll.,N. Y., p. 95. Troost, Cat. EiN- 

 NEV, Check Li.st, No. 250. Wheatley, Cat. Shells U. S., p. 27. Catlow, 

 Conch. Nomeuc, p. 188. Brot, List, p. 38. Keeve, Mouog. Melania, sp. 320. 



Description. — Shell smooth, acutely turreted, thin, pale 

 yellow, striate above : spire drawn out ; sutures im- 

 pressed ; Avhorls uiue, flattened ; aperture small, ellipti- 

 cal, angular at the base, within bluish. 



Habitat. — Ilolston Eiver, Tennessee. 



Diameter, -27 ; length, -85 of an inch. 



Observations. — This species is somewhat like the teres 

 herein described. It may be distinguished, however, at 

 once, by its flattened whorls aud darker color. — Lea. 



Fig. 224. 



The figure is a copy of Mr. Lea's. 



