which inhabit Jamaica. 167 



which C. Dunkeri is the type. The differences, although 

 very constant, are small, except in size. In this respect the 

 differences are both greater and less constant. Since however 

 the peculiarities extend to many characters, as size, general 

 form, form of the whorls and of the aperture, the sculpture, 

 and color, we regard them provisionally as species, although, 

 it must be acknowledged that the varieties of C. Maugeri 

 have nearly as good a claim to this rank. The same general 

 remarks on their distribution might be made, as in the case 

 of C. Maugeri. 



CvLiNDRELLA PRiNCEPS. Shell like C. Dunkeri, but differ- 

 ing ill the following characters : it is much larger ; is of a 

 reddish brown or horn color ; the striae are much finer, being 

 nearly microscopic ; the whorls are flat : aperture elliptical 

 and angulated at the lower extremity ; lip quite thick : it 

 loses about eigiit whorls by truncation and has twelve remain- 

 ing. Inhabits Swift R. head, St. George. Length .98 inch ; 

 breadth .15 inch. 



Cylindrella elatior. This is also a larger shell than C. 

 Dunkeri, thicker, and strongly striated, with the whorls more 

 planulate : it is much longer and more slender than C. rubra. 

 Inhabits Westmoreland. Length .93 inch ; breadth .13 inch. 



Achatina striosa is possibly only a variety of Bulimus 

 octonoides with the columella truncated. 



Achatina proxima. Shell conic but slender : very pale 

 brown or horn color ; with dark brown transverse stripes, about 

 three on each whorl, less distinct on the upper whorls : with 

 fine regular transverse small elevated lamellae : apex moder- 

 ately obtuse, smooth on the nuclear whorls : spire long, with 

 the outlines nearly rectilinear : whorls eight, planulate, ab- 

 ruptly shouldered above, with a rather deep suture : aperture 

 small, ovate : labrum thin and sharp : columella nearly 

 straight. This shell resembles A. Blandiana. Its divergence 



