276 PROCEEDINGS OF UAITED STATES NATIONAL MUSEUM. [IdS.". 



shell beiug trausported to the West Indies, iiud the two may probably 

 prove distinct with better material. The animal has an entire foot 

 with sliort tentacles, well developed eyes, and rather short muzzle. It 

 was found living by Hemphill and Calkins. In adolescent shells, it is 

 clearly seen that the anterior fold is coutinuous with the inner, and the 

 posterior fold with the outer edge of the columella, whi(;h edges are 

 strongly twisted and respectively continuous with the peiistome, the 

 space between them being broadly excavated. 



It is probable that this is identical with the species referred to as A^ 

 Dominicensis by Ferussac from Santo Domingo. As that species was not 

 described in such a way as to be ideutitiable, it is i^robably better to 

 retain the well-known name of Menke. 



Genus Tralia Gray. 



Trdlia Gray, Turt. Man. Brit. Sh., '2d ed., p. 21, 1840; P. Z. S., 1847, p. 179; 



Pfr. Zeitschr. fiir Mai., 1853, p. 7. 

 Tralia, sp., H. & A. Adams, P. Z. S., 1854, pp. 11-12; Geu. Rec. Moll., 11, p. 244, 



1855 ; W. G. Biiiuey, ]. c, li, p. 16, 1835. 

 Voluta, sp., Gmelin, Donovan, Tnrton. 

 Bitlinuis, sp., Brngiere. 



Jnricula, sp., Ferussac", Lamarck, D'Orbiguj'. 

 Mclampns, sp., Pfr. Mou. Aur. Viv. 1856, p. 46. 



Shell elongated, witli a plait on the column and two on the body 

 whorl ; out lip thickened, not lirate ; foot etitire, elongated, simple be- 

 hind. 



Several sections which were established by H. A. Adams, under this 

 genus {Pira, Signia, Persa)^ according to Dr. Paul Fischer, should be 

 united with Melampus. Neither that antlior nor Mr. Tryon seem to 

 liaN'e noticed that Tifata H. & A. Adams and Detracia Gray were 

 founded on the same tyiie. I have seen no reference to observations 

 by any one in this country on the living animal of the type of Tralia, 

 which is apparently not rare in Southern Florida. 



It is not known to what animal the figure of Tralia given by Binney in 

 the Land and Fresh Water-Shells of North America (part 2, p. 16) be- 

 longs. It is said to be drawn by Stimi)son from a species found in 

 Charleston Harbor, and may represent Alexia detiticnlata, especially as 

 the genuine Tralia pusill a, is not yet known from so far north. 



Subgenus Tralia s. s. 



Peristome thickened, slightly reflected ; anterior parietal lamina 

 largest; outer lip sinuous, concavely impressed at the middle with a 

 single strong ridge longitudinally revolving into the depths of the ap- 

 erture. Tyx)e Voluta piisilla Gmelin. 



Tralia pusilla Gmelin. Plate 18, fig. 5. 



Vohda ixusiUa Gmelin, Syst. Nat., p. 3436, 1789, fide Pfeifi"or; Dillwyu, Rec. Sh., 



1, p. 507, 1817. 

 Voluta iripUcata Donovan, Brltisli Shells, pi. 138, 1802. 



