MARYLAND GEOLOGICAL SURVEY 221 



Subgenus EVALEA A. Adams. 

 OdOSTOMIA (EvALEA) MARIANA n. sp. 



Plate LIV, Fig. 5. 



Description. — Shell small, elongate-conical, six-whorled; whorls gently 

 convex, marked with faint impressed revolving striae; sutures very dis- 

 tinct; plait small, near the upper end of the columella. 



Length, 2.8 mm, ; diameter, 1 mm. 



Occurrence. — St. Mary''s Formation. St. Mary's Eiver. 



Collections. — Maryland Geological Survey, Cornell University. 



Subgenus SYRNOLA Adams. 



Odostomia (Syrnola) marylandica n. sp. 

 Plate LIV, Fig. 6. 



Description. — Shell elongate, pyramidal, twelve-whorled ; sutures not 

 deep; whorls nearly flat; surface polished; lines of growth faint; spiral 

 striae irregular and often obsolete; base rounded; plait weak at the 

 mouth, stronger within, situated near the upper end of the columella. 



Length, 9 mm. ; diameter, 3 mm. 



Occurrence. — Calvert Formation. Plum Point. 



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

 Cornell University. 



Subgenus PYRGULINA A. Adams. 



Odostomia (Pyrgulina) calvertensis n. sp. 

 Plate LIV, Figs. 7, 8. 



Description. — Shell small, pyramidal, twice as long as the basal diam- 

 eter, five-whorled; whorls slightly convex, with many very fine, closely- 

 set revolving lines and about twenty (on the body whorl) longitudinal 

 ribs which are not overridden by the revolving lines; plait prominent, 

 situated very high on the columella. 



Length, 2.8 mm. ; diameter, 1.3 mm. 



Occurence. — Calvert Formation, Plum Point. 



Collection. — Maryland Geological Survey. 



