292 PROCEEDINGS OF THE ACADEMY OF [Sept., 



front to the base, where it is abruptly constricted or wrinkled, forming 

 a conspicuous spiral sulcus which separates the body from the 

 pillar; aperture subovate, grooved posteriori}' and produced anteriorly- 

 into a short, broad, slightly recurved canal; outer lip thin and crenu- 

 lated along the margin in harmony with the spiral sculpture, thickened 

 or varicose in very old individuals; inner lip excavated and calloused; 

 parietal wash very thick and heavy in old individuals; columella 

 reinforced, marked by a very oblique fold near the anterior extremity 

 and along the margin of the anterior canal; pillar short and broad; 

 umbilical chink shallow; anterior fasciole a broad and oblique ridge 

 registering the incremental stages of the anterior canal, extremity 

 broadly and quite deeply emarginate. 



Dimensions (immature individual). — Altitude 54.5 mm.; maximum 

 diameter 35 mm. 



This magnificent species is common at Coon Creek but even though 

 the shells are thick and fairly strong the specimens are nearly always 

 crushed as they occur in the matrix, so that perfect specimens are 

 rarely obtained. The shells reach considerable dimensions; imperfect 

 specimens in the collection show that some individuals had an 

 altitude of about 80 mm. and a maximum diameter of about 50 mm. 

 The species is well characterized by the retractive axials which are 

 unusually elevated and strongly rounded. The interaxials are 

 unusual because they are so deep and narrow. The spiral sculpture 

 consists of both primary and secondary cords. The peculiar spiral 

 sulcus at the base of the body is conspicuous on the outer wall of the 

 shell but produces little or' no effect on the inner surface of the shell 

 wall within the body cavity. 

 Seminola solida n. sp. PI. XIX, figs, l, 2. 



Description. — Shell of medium size and rather stout or coarse, 

 globose in outline; spire low and obtuse, its elevation about one-third 

 the total altitude of the shell ; whorls five in number on an incomplete 

 individual, rapidly increasing in size to an inflated body; sculpture 

 elaborate, both axial and spiral, axial costse seventeen to eighteen on 

 the body, subequal and subequispaced, very narrow, abruptly 

 elevated, somewhat incremental in character, terminating abruptly 

 at the shoulder and diminishing in strength upon the anterior slope 

 of the body; inter-costal spaces concave and not so wide as the 

 costse; spirals less coarse than axials but overriding them; fillets 

 ten in number on the ultima and two on the penultima, spirals equal 

 and equispacecl, more prominently elevated on the summits of the 

 costals than in the inter-costal areas; an unornamented sutural 



