44 FOSSILS FROM SOUTHEFX UMTFD STATES— BALL. vol. xviii. 



sides of tlie wliorl sinootli, except for obsolete spiral lines, ratber wide 

 and irregularly spaced ; iu the anterior third they are stronger, but even 

 there not very marked; some specimens seem to indicate a faded color- 

 pattern of continuous, narrow, spiral lines, rather evenly and nniforndy 

 spaced; aperture narrow, of efpial width, or nearly so; the anal notch 

 moderately deep, the pillar straiglit, with a narrow callous part not 

 showing' any ridge or plait. Longitude of spire, 5; of shell, 05; diam- 

 eter, 35; width of aperture, mm. 



HaMtat.—Chiiwln beds (2211-2213), Florida. 



Types.— Iso. 113920, U. S. N. M.; and in the Aldrich collection. 



This species is the largest yet found iu these beds, and among recent 

 species finds its nearest analogue in C. papilionaceiis, Hwass. It is a 

 more slender shell than the latter, with more flattened spire and larger 

 nucleus. It is a shell without striking characteristics, yet which will 

 not fit in with any of the other forms of this horizon. 



PTEROPURPURA POSTII, new species. 



Shell of moderate size, with five whorls, beside the (decollate) nucleus, 

 with three sharp, continuous varices exteiuling down the si)ire and a 

 single prominent intervarical nodule on the interspaces of the whorls; 

 the last varix broader than any of the others, with a posterior angle, 

 the front sculptured with fine crenulate imbricated lamelhe, the back 

 smooth, except for the ends of the spiral ribbing; spiral sculpture of 

 (about 15 on the last whorl) low spiral ribs most prominent on the 

 varices and on the intervarical nodules, the rather wide interspaces 

 finely spirally striate; aperture small, subovate, the outer lip with 

 about seven strong teeth; the body with a thin, smooth callus; suture 

 appressed, obscure; canal open, narrow, not quite as long as the aper- 

 ture; on the siphonal fasciole a single projecting remnant of an earlier 

 canal is visible. Length, 38; of last whorl, 28; of aperture, 14; diam 

 eter of shell, 20 mm. 



Habitat. — Ballast Point, Tampa, Florida, old Miocene silexbeds: a 

 single specimen collected by E. J. Post. 



Type.— 'No. 130349, U. S. N. M. 



It is possible this should be referred to Pterorhi/tis rather than 

 Pteropurpnra, but there does not appear to be any long tooth on the 

 edge of the outer lip as usual iu the former genus. 



Genus GYRODES, Conrad. 



Subgenus GYRODISCA, Dall. 



Shell like Gyrodes, but small, without any channel in front of the 

 suture, the umbilical angle crenate l)y the transverse lamellar or fibrous 

 sculj)ture: the nucleus small, prominent, glassy, the shell otherwise 



