92 POST-PLEIOCENE FOSSILS. 



ARCHITECTONICA.— Bolton. 

 SOLARIUM.— Lam. 



ARCHITECTONICA GEMMA. — {New ^ecies.) 

 Plate 5IV. Figs. 6, 6a, C6. 



Description. Shell orbicular, sub-trocliiform, deeply umbilicated ; spire obtuse ; 

 wliorls about four or five, angulated ; a finely serrated carina at the periphery extends 

 from the mouth nearly to the apex, where it becomes obsolete ; aperture sub-quadrate ; 

 peristome thin, angulated above and below; umbilicus large, spiral, crenulated; base 

 transversely marked with the lines of growth, which extend from the periphery of the 

 body-whorl and form the crenulations on the margin of the umbilicus ; suture distinct. 



For this beautiful little shell we are indebted to Dr. Edm'd Ravenel, of the Grove plan- 

 tation, who found it in the marl beds of Cainhoy, Wando river. Only one specimen yet 

 obtained. The serrated carina around the pheriphery is not visible to the unassisted eye, 

 but requires a lens of moderate power to be distinguished. 



Plate XIV. Fig. 6, Natural size. 



" 6a, Magnified view. 



" 6^, Outline of form magnified. 



Locality. Cainhoy, Wando River. Cabinet of Dr. Edm'd Ravenel. 



ANGARIA.— Bolton. 

 DELPHINULA. — RoissY. 



ANGARIA CRASSA.— {New Species?) 

 Plate XIV. Figs. 7, la, lb. 



Descriptioist. Shell solid, smooth, turbinate, umbilicate; spire obtuse, discoidal; 

 whorls three to four, ventricose. sub-angulated above ; body-whorl larger than the entire 

 spire; suture angulated, deeply impressed; aperture rounded; entire peristome thick, 

 reflected ; labrum very thick, greatest on the superior edge; umbilicus wide; spiral-margin 

 round, smooth. 



A fiUiform carina, produced by the flattening of the upper surface of the whorls, extends 

 from the apex to the aperture ; in many specimens it becomes obsolete near the apex, and 

 also near the aperture. 



Of thirty -four specimens, which we have collected from the marl beds of the Stono, not 



