AMPHIBULIMA. 237 



between the fossil form of the main island -and these Marie-Gahmte 

 shells. 



In Dominica the species is not uncommon (figs. 16, 17, 18). The 

 shell is more strongly sculptured with spiral decurrent wrinkles or 

 malleation than in Guadelupe, and the color is somewhat deeper. 

 Mr. Binney has also found some small differences in the dentition ; 

 and it will probably be best to distinguish the local' variety by the 

 name var. dominicensis. 



In St. Kitts the shells are weakly sculptured, as in those from 

 Guadelupe; there is much less red in the coloring than in the Do- 

 minican form. I do not see that they have any varietal features. 



In the island of Saba, Ober collected a small form, not differing, 

 except in size, from those of St. Kitts. 



A. TIGRIXA (Lesueur). PI. 61, figs. 24, 25. 



Shell oval, pellucid, very thin, somewhat greenish, with small 

 scattered reddish spots. Aperture very large, ovate ; spire very 

 short. 



The shell is very much depressed and somewhat patelliform, the 

 spire consisting of 1^ whorls. The last whorl is almost open, the 

 enclosed portion being very small. The shell is exceedingly thin, 

 finely striated with growth-lines; it is amber-yellow, and bestrewn 

 with little rounded russet spots. Length 18, width 11 mill. 



Island of St. Vincent. 



Helix (CocJdohydra) tigrina Lesueur, FERUSSAC, Prodr., p. 26; 

 Histoire, pi. 11 A, f. 4. Sucdnea tigrina GRAY, Ann. of Philos., 

 ix, 1825, p. 415 DESK, in Encycl. Mth., ii, p. 19 ; in Fer. Hist., 

 ii, p. 140; in An. s. Vert, viii, p. 320 PFR., Monogr. ii, p. 530; 

 iii, p. 21 ; v, p. 26. Amphibulima tigrina BECK, Index Moll., p. 98. 

 E. A. SMITH, Proc. Malac. Soc. Lond. i, p. 307. 



The above description is from Deshayes, the figures from Ferussac. 

 Other authors have added nothing to this characterization of the 

 species. 



My reason for retaining tigrina as distinct from pardalina is that 

 the number of whorls is less 1^ instead of 2^ and there is no men- 

 tion of spiral sculpture by Deshayes. No Amphibidima has been 

 found on St. Vincent by later collectors. 



A. PARDALIXA Guppy. PI. 61, figs. 20, 21, 22, 23. 



Shell long-ovate, *SWcme-shaped, with very short, obtuse spire; 



