PLEUROCERA. 95 



Observations. — I owe to Dr. Gould the opportunitj' of describing this 

 beautiful little species. It differs from P. grossa, Anth. (young of 

 olvearc) in being more slender, different in color and in having bands ; 

 the aperture is not nearly so large proportionally and the plicas are flner. 

 — Tnjon. 



r. Smooth, Angulate Pleurocerce. 

 38. P. elevatum. Say. 



Melania elevata, Sat, Jour. Acad. Nat. Sci., ii, p. 176, Jan., 1821. Binney, Reprint- 

 p. 70. BiXNEV, Check List, No. 97. Jay, Cat., 4th edit., p. 273. Lapham, 

 Cat. Moll. Witfconsiu, p. 3G8. DeKay, JIoll. N. Y., p. 9G. Wheatley, Cat. 

 Sheila U. S., p. 2J. Catlow, Couch. Nomenc, p. 18G. Bkot, List, p. 30, 

 Reeve, Mouog. Melania, sp. 442. 



Ceriphasia elevata, Sr.j-, Cuenu, WauinJl, i, f. 1901. 



Mtlaniaelongatu, Lea, riiilos. Trans., iv, p. 121, 1. 15, f. 29. Obs., i, p. 130. Troost, 

 Cat. BiNXEY, Check List, No. 99. Wubatley, Cat. Shells U. S., p. 25. Bkot, 

 List. p. 30. 



Cerivhasia clonr/ata, Lea, CllEXU, Manudl, i, f. 1959. 



ElunUi elevata. Lea, Adams, Genera, i, p. SCO. 



Melania tracta, Anthony, Bost. Proc, iii, 3G1, 1850. Reeve, Monog. 429, 1861. 



Description. — Shell gradually attenuating to the apex, slightly and 



irregularly wrinkled, olivaceous; suture not deeply impressed; volu- 



tious nine or ten, with several more or less cle- „. „. 



' Fig. 180. Fig. 181. 



vated revolving lines, of which one being more 

 conspicuous gives the shell a carinated appear- 

 ance ; aperture oblique, equalling the length of 

 the second, third and fourth volutions conjunctly. 



Length, one inch ; breadth, two-fifths. 



Habitat. — Ohio Eiver. 



Observations. — Distinct from our other species, 

 by the elevated revolving lines. — Saij. 



It may be doubted whether elevatum and Leivisii will r.ot 

 eventually proYe to be the same speeies ; I am much inclined 

 to doubt their specific distinction. 



The present shell inhabits the waters of Ohio, Indiana and 

 Illinois, the Ohio River, Kentucky and West and Middle 

 Tennessee. 



Mr. Say and other conchologists have considered Mr. Lfa's 

 elongatum to be a synonyme of elevatum, in whicli opinion I 

 concur. The following is the description and copy of tho 

 fjcrurc of . 



