1XX AMPHIBL'I.IMA. 



cusp, the two outer denticles larger, as in Gaeotis. Genital system 

 similar to that of Amphibulima. 



A. rubescens Dh. xii, 240. Martinique. 



Subgenus PELLICULA Fischer, 1856. 



Shell oval, Succmea-\\ke, smooth, with extremely large aperture 

 and small spire, composed of less than two whorls ; columella with a 

 thin, blade-like appendage. Animal externally almost slug-like, the 

 mantle reflexed over the shell (pi. G2, fig. 33, A. appendicidata, after 

 Fischer). 



The jaw resembles that of Amphibulima but has fewer plaits, 40 

 in appendiculata, 23 in depressa. The raduhi of appendicidata has 

 32.12.1.12.32 teeth. These centrals are tricuspids, the mesocone 

 long and pointed ; laterals with broader, shorter, but still conic cusps 

 (pi. 62, fig. 31, after Binney). The genital system (pi. 62, fig. 35, 

 A. appendiculata, after Fischer) is almost exactly like that of Amphi- 

 bidimn patithi. Both species are from Guadalupe. 



A. appendiculata Pfr., xii, 241. A. depressa Rang, xii, 242. 



Genus G^EOTIS Shuttleworth, 1854. 



Manual xii, p. 227. 



The jaw is extremely thin and delicate, with over 40 narrow 

 plaits, as in Drymceits and Urocopiis, but with no triangular area in 

 the middle (pi. 61, fig. 24, after Binney). 



The ladula is composed of V-shaped rows of teeth (pi. 61, fig. 24). 

 " Centrals with base of attachment very long, narrow, obtuse above, 

 incurved at the sides, obtusely rounded and expanded at base [pos- 

 terior end], near which is a short, gouge-shaped expanded cusp, 

 whose lower edge has three bluntly rounded cutting points. Laterals 

 same as centrals in shape, but a little longer, and asymmetrical from 

 the disproportionate expansion of the cutting-point. Marginals same 

 as laterals, but more slender, with more developed and graceful 

 cutting-points, of which the median is pointed, often bifid. There is 

 much variety in shape and denticulation of the cusps. The middle 

 denticle is always the smallest" (Binney}. 



The form of teeth shows a relationship to Amphibulima. All the 

 species known are from Porto Rico. 



G. nigrolineata Shuttl.,xii, 229. G. malleata Pits., xii, 230. 

 G. flavolineata Shuttl., xii, 229. G. albopunctulata Shuttl., xii, 230. 



