324 TRANSACTIONS OF THE WAGNER FREE 



The species I have been able to examine comprise nearly all that have 

 been known from our Tertiary and several new ones. They may be allotted 

 places as follows : 



Solariaxis. S. elaboratiim Conr., with elevated, flattened, rounded and 

 keeled varieties, which include ornatwn Lea (more granular and rounded than 

 the type), of which canaliadatiim Conr. non Lam. is a synonym. The most 

 elevated form of 5. elaboratiim I have seen is from Jackson, Miss., a specimen 

 measuring g mm. high by 14 mm. in greatest diameter. This form was also 

 remarkable for the intense development of annulation on all the spiral sculpt- 

 ure, including the peripheral keel, with elegant uniformity, giving a beaded 

 rather than the usual subgranulate aspect. At nearly the opposite extreme 

 of sculpture in the species are some specimens in Mr. Aldrich's collection from 

 Gregg's Landing, Ala., which show the spirals nearly simple below, except 

 the umbilical carina, and above only faintly articulated. These shells have a 

 tendency to margination in front of the suture, and especially at the periphery, 

 thus indicating the passage toward 5. acututn. They also are exceptional in 

 having two or three slender umbilical ribs instead of a single rather larger 

 one, as is more usual. 



The flatter forms of tiiis have a very thin, wide margin, and tend toward 

 the type 5. actitmn Conr., which includes 5. vespertinum and Meekiamim 

 Gabb, both as mere sculpture-variations without any indication of constancy. 

 In the typical elaboratiim the umbilical walls are nearly vertical, and the um- 

 .bilical rib (not the carina) is not specially prominent ; in ornatum the umbili- 

 cus flares a little more and the rib is more projecting. S. delphimiloides 

 Heilprin (not Meyer) belongs hereabouts. In acutum the umbilical carina 

 has receded still more and the rib is very prominent ; 5. Meekiamnn only 

 differs by having a small thread between the umbilical rib and the carina. The 

 species in its di<fferent varieties is widespread in the Eocene. 



5. Cossmamii n. s. (pi. 22, figs. 14, 14 a) has the umbilical carina promi- 

 nent and coarsely annular, with half a dozen granular riblets forming a con- 

 tinuous series up to the umbilical rib proper; the latter is not very promi- 

 nent. The whole sculpture is sparsely granular, the whorls obtusely carinate, 

 depressed, with two strong granular ribs behind and a row of granules before 

 the suture. This form has seven whorls, with an elevation of 6.0 and a max. 

 diameter of 12.5 mm. The young have fewer spirals on the umbilical wall, 

 and the adult shows a curious wrinkling of the incremental lines in the inter- 

 spaces. 



We have it from the Claiborne Sands, Gregg's Landing, Alabama, and 

 the Eocene of Newton and the Wahtubbee Hills, Mississippi. 



Near 5. Cossmanni I place temporarily a young shell collected from 

 Matthews' Landing, Alabama River, by L. C. Johnson, U. S. Geol. Survey, 

 which may be called 



S. alabamense n. s. (pi. 22, fig. 17), Shell with two and a half whorls 



