INSTITUTE OF SCIENCE, PHILADELPHIA. 327 



pressed lines behind the suture on the spire. It is from the Eocene of Clai- 

 borne and Clark Co., Ala. ; Jackson, Miss. ; Creole Bluff, La. ; Gonzales, Tex., 

 and Orangeburg, S. C. 6". cognata Gabb, from the Tejon Eocene of Califor- 

 nia, belongs near this group, if the figures are to be trusted. 



Solarium s. s. Beginning with the less typical forms, 5. fungimim Conr. 

 (_|- S. Iienrici Lea) is well discriminated by its flattened dome with impressed 

 suture, from which, on the spire as well as from the umbilical sulcus, sharply 

 impressed lines radiate ; the periphery is keeled and marginate and there are 

 no other spiral lines. It is known from Claiborne, Clark Co. Ala., and Wah- 

 tLibbee. 5. trilineatitm Conr. (Miocene of Plum Pt, Md.) is higher, with articu- 

 lated bands on both sides the suture and more numerous incised spiral lines. 

 S. bellastriattim Conr. is a well-marked form-of the same type, but larger, 

 without beading or articulation in front of its deep-cut suture, with strong 

 radial grooves above and below, and a single spiral groove on the middle of 

 the base between the umbilical sulcus and the peripheral keels. We have it 

 from Jackson and Garland's Creek, Miss. 



A variety, 5. triliraitivi Conr., has several basal grooves crossed by the 

 radii and tessellating the interspaces ; the upper surface of the whorls has a 

 medial spiral groove cutting that part so as to form three flat bands between 

 the sutures, including the broad upper peripheral keel ; it comes from the 

 Claiborne Sands, the Claiborne white limestone, Wahtubbee, Newton, Jackson, 

 and Carson's Creek, Miss. It is smaller than the typical bellastriatinn. 



Another variety, vicksburgensis Dall (pi. 22, figs. 4, 4 a), has between 

 the peripheral keel and the suture above four nearly equidistant incised lines, 

 obliquely tessellating the surface when they cut the regularly spaced radial 

 grooves. The base has four tessellated bands between the lower peripheral 

 keel and the sutural sulcus ; they decrease in width outward and the three 

 outer ones are taken into the aperture by the proceeding whorl, together with 

 the peripheral keel. Alt. 6.5 ; max. diam. 12.0 mm. in a specimen having six 

 whorls. It is found in the Eocene of Vicksburg, Miss. If the figure given 

 by Gabb of his S. Hornii of the Tejon beds of California be reliable, that 

 species should be ranged in this vicinity. 



Another variety of the bellastriatmn type may be called 5". var. neivtonense 

 Dall. It differs from the type by having the umbilical carina divided into two 

 by a second narrow sulcus, and in having two adjacent narrow, incised spiral 

 lines on the middle of the base, instead of a single one. The shell is small, 

 about 5 by 10 mm. Several specimens are in the Aldrich collection from 

 Newton, Miss. It recalls 5. ccslatJira Conr., but has a different upper sur- 

 face. 



5'. mnphitermwn Dall is described later on. It is marked by its stout pe- 

 ripheral keel and niarginating rib, both elegantly articulated by radiating 

 grooves, and by the rest of the whorl being nearly smooth. It is a Miocene 

 species from Greensboro', Md. 



