STERKIA. 53 



Bifidaria rhoadsi PILS., Proc. A. N. S. Phila., 1899, p. 404, 

 figs. 1, 2. 



The teeth are slightly larger in the specimen from Dismal 

 Key, of which an internal view is given (fig. 3). At present 

 it is one of the rarest American snails. Only two specimens 

 have been found in the great amount of woodland debris 

 which has been worked over in this laboratory. Dr. Clapp 

 found about a dozen in a bushel of rubbish from near Fort 

 Lauderdale, a place on the mainland above Miami. 



Very close to 8. eyriesi. The shell is a little larger and 

 more slender, with relatively smaller aperture. No actual 

 intergradation in these characters has been observed in the 

 very small number seen ; yet it seems unlikely that they will 

 prove of specific constancy when fuller series come to hand. 



It resembles B. Clementina in the relatively smooth surface 

 and moderately developed teeth, but differs by the obliquely 

 ascending columellar lamella and other details of structure. 



3. STERKIA ANTILLENSIS n. sp. PL 6, figs. 8, 9, 10, 11. 



The shell is shortly cylindric, cinnamon-colored, glossy, 

 under the microscope showing some weak, uneven striation 

 and rugosity (such as the typical Nesopupae have, but only 

 weakly developed), the first 1% whorls microscopically gran- 

 ular. The summit is obtuse ; whorls strongly convex, the 

 last having a furrow behind the lip, over the upper palatal 

 fold. The aperture has a rather distinct sinulus, the outer 

 lip being bent in. The peristome is well developed and col- 

 ored like the exterior. The angular lamella is high, curved, 

 and more or less strongly connected with the termination of 

 the lip. Parietal lamella high and long. Columellar lamella 

 situated high, obliquely ascending inwardly. The two palatal 

 folds are well developed, both somewhat immersed, but the 

 lower one more deeply. 



Length 1.73, diam. 0.95, alt. aperture 0.7 mm. ; 4% whorls. 



Length 1.85, diam. 1 mm. ; 4% whorls. 



Cuba: El Abra, Vinales (type loc.) and Rosario (Hender- 

 son). Jamaica: west of Port Antonio (Henderson and 

 Simpson) ; near Mandeville (Dr. A. P. Brown). 



