329 Midway Stage ii5 



Solarium periscelidum, PI. 12, ng. 5. 



■ Syn. 5. periscelidum Dall, Trans. Wag. Fr. Inst. Sci., vol .iii, 

 1893, p. 325. pi. 22, fig. II. 



DalVs original description.— ''Shell depressed, rather small, 

 with four or more post-nuclear whorls; periphery with a rather, 

 strong annulate rib with a fainter one on each side, the one behind 

 separated by a well-marked, sometimes excavated, interspace; 

 suture appressed, with a granular line in front of it and often 

 several feebler rows in front of that, the surface of this part of 

 the whorl somewhat concave or flattish; base rounded from the 

 keel to the umbilical carina, which is nodular, with or without_ a 

 few broken fine spirals outside of it, crossed by weakening radial 

 wrinkles; umbilicus rather wide, with a small, well-marked, 

 annulate umbilical rib, and the walls transversely wrinkled and 

 somewhat concave. Alt. 4.2; max. diam. 9.0 mm." 



Localities.— K-L^^AM^: Matthews' I^anding; i mi. W. of Oak 



Hill; ? casts, i mi. N. of Midway. 

 Type. — Aldrich collection (specimen figured). 



Solarium sp., -P^- ^^' ^^' "■ 



This is evidently a young shell and bears a strong resemblance 

 to the smaller whorls of 5. cupola Heilprin, but the largest whorl 

 does not begin to show signs of a deflected margin, nor are the 

 subsutural spirals present. Better specimens may permit of 

 specific description. 



Locality. — Alabama: Matthews' lyanding. 



Specimen /^z^r^o'.— Paleontological Museum, Cornell Univ. 



RISSOINA. 

 Rissoina alabamensis, PI- ^2, ng. 7. 



Syn. Rissoina alabamensis Aid., Bull. Am. Pal., No. 2, 1895, 

 p. 14, pi. 2, fig. 8. 



Aldrich' s original description.— ''Shell solid; whorls nine, the 

 first four smooth, embryonic, then follow four rounded adult 

 whorls showing fine spiral lines which are slightly pitted at the 

 intersections of lines of growth with them; body whorl rounded, 

 convex, contracted below centre to form the base on which the 

 lines of growth are more strongly marked; aperture oblong-ovate 

 outer lip channelled anteriorly, thickened and expanded poste- 

 riorly and strongly sigmoid. 



''Locality. — Matthews' Landing, Ala." 



