260 AMERICAN JOURNAL 



body whorl very large comparatively, the ribs thick, acuminate 

 at the summit, prominent, profoundly recurved ; aperture nearly 

 round, with a thick margin. 



^S'. paehypleura, Conrad. Joui n. Acad. Nat. Science, Vol. 

 viii., 1862, p. 665. 



Locality. — Calvert Cliffs, Md. 



Observation. — I found one specimen, very perfect, but the 

 ficrure represents a specimen presented to the Academy by Pro- 

 fessor Cope. This and the fragment of another were all he ob- 

 tained in a large collection of Miocene fossils from Charles Co., 

 Md. 



ARCHITECTONICID^. 

 ARCHITECTONICA, Bolten. 

 Solarium, Lam. 

 A. TRILINEATA. — PI. 20, fig. 5. 



Description.-De^xes,s,Q(\. conical, whorls 5, convex, an impressed 

 revolving line below the suture and a raised line above the suture 

 slightly crenulated ; on the 3 upper whorls a crenulated line runs 

 in the impressed or canaliculate sutural space ; body whorl cari- 

 nated and crenulated on the periphery, above which runs another 

 broader, less prominent crenulated line with a concave canal 

 between them, and 5 or 6 obsolete revolving lines above ; whorls 

 crenulated at the upper sutural line and striated obliquely ; base 

 flattened, with a prominent revolving line near the periphery 

 and near it an obsolete line ; umbilicus wide, crenulated on the 

 margin and margined by a deeply impressed line. 

 Locality. — Calvert Cliffs, Md. 



A. trilineata, Conrad. Journal Acad. Nat. Science, Vol. 

 viii., p. 186. 



A. NUPERA. — PI. 19, fig. 8. 



Description. — Discoidal ; spire slightly convex, flat in young 

 shells ; suture canaliculated ; whorls with close, unequal crenu- 

 lated revolving lines, one on the periphery, another near it and 

 one on the summit of the whorls larger than the others ; base- 

 convex, Avith 10 crenulated revolving lines, three or four most 

 prominent ; the one nearest the umbilicus largest and crenate ; 

 umbilicus moderately wide. 



Solarium nuperum, Conrad. Journ. Acad. Nat. Science, vol. 

 vii., p. 141. 



Locality. — Suffolk, Va. 



Observation. — Species of this genus chiefly inhabit the eastern 

 seas. 



