PLEUROCERA. 



91 



Fig. 170. 



Observations. — I have three specimeus before me. all of which differ 

 slightly. Two are dark browa and they are purple within. The third 

 is light horn-color, with light browu bauds covering the 

 greater part of the whorls. The upper whorls of all three 

 are carinate. It is allied to Melania {Trypanostomd) annu- 

 lifera, Con., but it is a smaller shell, more attenuate, and 

 the aperture is more rounded at the base. The aperture 

 is about one-fourth the length of the shell. I have great 

 pleasure in calling this after my friend Dr. Lewis, of 

 Mohawk, New York, who has aided me greatly by sending 

 me very many new shells from our fresh waters. — Lea. 



This species may be only a striate form of devatmn. Say. 



33. P. annuliferum, Conrad. 



Melanin arinuUfera, CoyRXV,'Sev>- Fiesh Water Shells, p. 51, t. 8, f. 2, 1834. .Tat, 



Cat., 4th edit., p. Hi. Bixnev, Check List, No. 17. DeE:ay, Moll. N. Y., p. 



94. WiiEATLEY, Cat. Shells U. S., p. 24. Bkot, List, p. 30. Catlow, Conch. 



Xomeuc, p. 185. Reeve, Monog. Melania, sp. 308. MUllek, Synops. 44. 

 Melania annutata, Conrad, JAV, Cat., 2nd edit., p. 455. 

 Melania Ordiana, LEA, Philos. Proc, ii, p.-242, Dec, 1842. Philos. Trans, ix, p. 26. 



Obs.,iv, p.26. 'Wheatlev, Cat. Shells U. S., p. 26. Binney, Check List, 



No. 191. Bkot. List, p. 30. 

 Cerlphasia annuUfera. Conr.. Adams, Genera, i, p. 297. 

 Cjriphasia Ordiana, Lea, ibid. , p. 297. 



Description.— Shell elevated, subconical, with flattened whorls and 

 elevated, distant ribs, alternately smaller; about five on the body- 



Fig. 171. 



Fig. m. 



Fig. 173. Fig. 174. whorl and three on 

 the adjoining one; su- 

 ture obsolete ; color 

 generally blackish ex- 

 teriorly and dark pur- 

 ple within. 



Observations. — In- 

 habits with the pre- 

 ceding species, from 

 which it differs in be- 

 in g less ventricose, 

 and having the ribs plain; the aperture is shorter than in the pre- 

 ceding The three specimens figured are from Alabama; it will be 

 noticed that in one of them, the central stride arc tuborculate, thus 

 forming a connection with Foremanii, Lea. — Conrad. 

 The following is regarded as a sj-nonyme : 



