164 SYSTEMATIC TALEOXTOLOGY 



mens of lunaia as well as does his original description of tlie latter 

 species, while the figure is much better. 



Length, 20 mm.; diameter, 11 mm. 



Occurrence. — St. Mary's Formatiox. Cove Point, St. Mary's River, 

 Langley's Bluff. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Philadelphia Academy of Natural Sciences. 



Caxcellaria pruxicola n. sp. 

 Plate XLITI, Figs. 6a, 6b. 



Description. — Shell turreted, nearly as broad as long, six-whorled; 

 with broad, flat tops (concave on some specimens), and straight sides 

 perpendicular to the tops; longitudinal ribs, small, distinct, and num- 

 erous, with many fine, sharp, intermediate lines of growth; broad, raised 

 spiral strife five in number on the side of each whorl except the body 

 whorl which has twelve; tops of whorls almost without spirals; ribs and 

 spirals at the same distance and of about the same prominence, giving 

 a reticulate a])pearance; columella with three strong plaits; umbilicus 

 small. 



Length (restored), 24 mm.; diameter, 16 mm. 



Occurrence. — Calyert Formation. Plum Point. 



Collections. — Maryland Geological Survey, U. S. National Museum. 



C.A.XCELLARIA RETICULATOIDES U. Sp. 



Plate XLIII, Fig. 7. 



Description. — Shell small, oval, four-whorled without the nucleus; 

 nucleus four-whorled, smooth, depressed-naticoid, with its axis some- 

 what inclined to the left; spire with about five narrow-raised revolving 

 ribs on each whorl, and with regular longitudinal ribs which become 

 fainter on the later whorls; body whorl with about fifteen revolving 

 ribs and almost obsolete longitudinal ones; columella with three plaits, 

 the largest above and nearly horizontal, the others nearly horizontal 

 to the aperture, then bending sharply down the columella, below the 

 largest plait are two small, oblique denticles on the columella; labrum 

 with about six denticles; umbilicus small. The general form of this 

 species is much like that of C. reticulata. 



