GILLIA. 75 



Melania altilis, Lea, Proc. Am. Phil. Soo, II, 13 (1841) ; II, 150 (1,^42) ; 



Trans. VIII, 174, pi. v, f. 23 ; Obs. Ill, 12 (1843).— DeKay, N. Y. 



Moll. 95 (1843). 

 Paludina altilis, Ravenel, Cat. (no descr.). 

 Leptoxis altilis, Haldeman, Mon. Lept. 6, pi. v, f. 152 (1847?). 



Mr. Lea also gives the river Schuylkill, at Philadelphia, as the 

 habitat of this species (Pr. Am. Phil. Soc. II, 150). I have 

 myself found it in great plenty in the Delaware, at Burlington, 

 crawling on the mud exposed by the fall of the tide, together 

 with Amnicola limosa and other species. 



Mr. Lea's figure is copied in my Fig. 146. 



Judging from the description and figure given by Haldeman 

 of Leptoxis crenata, I should be inclined to refer it to this 

 species, especially as its habitat is the same (Santee Canal). I 

 have, however, followed the system of giving all the described 

 species of this genus, without regard to synonymy — it being very 

 difficult to decide doubtful cases. See the remarks under that 

 species. 



Cat. No.lNo.ofSp. 



9217 



Locality. 



From M'hom received. 



Delaware River, N. J. W. G. Bianey. 



Fig. 148. 



Gillia crenata, Haldeman. — Shell obliquely transverse, subglo- 

 bose, polished, rather solid, with four 

 convex whirls, and impressed suture ; 

 aperture oblique, very large, angular 

 posteriorly. Peritreme continuous on 

 the same plane. Color yellowish- 

 green, aperture white. 



Paludina crenata, Say in cabinet. 

 Paludina altilis, Rav. in cab. 

 Santee Canal, S. C. 



Distinguished from altilis by its obliquity, greater 

 thickness, straighter and thicker labium, comparatively shorter spire. 

 In other respects the species are much alike. This seems to belong to the 

 same genus as the European shells which Dr. Jay gave me as Paludina 

 naticoides and Lithoglyptus fuscus. (^Haldeman.) 



Leptoxis crenata, Haldeman, Mon. 6, 67, pi. v, f. 153 (1847 ?). 



The above is a copy of the original description and figure of 

 this species. I am inclined to believe it to be identical with the 



Leptoxis crenata. 



