258 CERION, GROUP XI. 



"Form.albea Mayn. (pi. 41-, /fig. .31). On the south side of Spruce 

 Key, a barren little islet north of Long Key, a few specimens, mostly 

 dead, of " Sirophia albea" Maynard occurred. They are rather 

 dark flesh-colored outside and within, or brown inside; uniform, or 

 with the ribs a little paler. A specimen measures, length 23^, 

 .diam. 10 mill.; ribs on penult, whorl 24. It seems nearly extinct, 

 as only three living ones were found. 



. A peculiar form allied to varium, ritchiei and eburneum is illus- 

 trated on pi. 44, figs. 78, 79, 80, It is pillar-like, some specimens 

 very large and long, with as many as 12^ whorls, others (fig. 79) 

 are much smaller. The lip is not expanded, aperture small with the 

 margins built forward. The locality is unknown, but as the speci- 

 mens occurred with Pleurodonte provisoria, Cepolis varians, the New 

 Providence form of Oxystyla undata, and some marine shells, it is 

 Jikely that they are from New Providence. 



Subsp. CORYI Maynard. PI. 41, figs. 32-36. 



The oblong-cylindric shell is solid, strongly ribbed, intervals 

 brown, in places black-brown, the ribs chiefly white, about 20 on 

 the penult, whorl. Aperture brown within, the peristome refiexed and 

 recurved, thickened on the face (fig. 34); parietal callus heavy and 

 .thick, but typically not elevated in a straight ledge. Parietal lamella 

 strong and usually rather long; axial lamella small but distinct. 

 Length 25, diam. 10-11 mill. There is also a short form, length 21, 

 diam. 9^-10 mill. This variety occurs on the extreme west end 

 of New Providence, on the bushes and herbage growing along the 

 bay. Five specimens, undoubtedly coryi, were taken by Mr. May- 

 Hard on Spruce Key, off Nassau, the type locality of " S. albea." 



Mr, Maynard's coryi, "form no. 5" (pi. 41, figs. 35, 36), is very 

 small, 17-^x8 to 20x9 mill., has a distinct ledge or ridge across the 

 parietal wall, the outer lip is not refiexed or thickened, and there are 

 about 25 riblets on the penult, whorl. Parietal lamella small. It 

 is very similar to " thorndikei " and exactly like some specimens 

 of'cinerea, form no. 1," of Maynard. According to Mr. Maynard, 

 there are many individuals of intermediate characters connecting 

 this form to coryi. 



Form neglectum Maynard (pi. 42, fig. 37). Whitish or gray- 

 white, sometimes blue-tinted in the interstices, and usually obscurely 

 jshowing a fe,\v .dark blotches. Ribs irregularly and widely spaced. 



