160 SYSTEMATIC PALEONTOLOGY 



DrILLIA LIMATULA VAR. PYRAMIDALIS n. var. 



Plate XLII, Fig. 16. 



Description. — Spire pyramidal, variable in acuteness; shoulder of 

 body whorl angular; beak short, slightly curved at extremity; columella 

 straight. 



This variety differs from Umatula as angulata does from incilifera. 



Length, 14 mm.; diameter, 5 mm. 



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

 Langley's Bluff. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



Drillia pseudeburnea (Whitfield). 

 Plate XLII, Fig. 17. 



Pleurotoma pseudeburnea Heilprin, 1887, Proc. Acad. Nat. Sci. Phila., vol. xxxix, 



p. 404. 

 Pleurotoma (Drillia) pseudeburnea Whitfield, 1894, Mon. xxiv, U. S. Geol. Survey, 



p. 114, pi. xxi, figs. 8-12. 



Description. — " Spire elevated, of about ten volutions; ape.^ papil- 

 late; whorls convex, porcellanous, strongly ribbed, somewhat im- 

 pressed on the shoulder; ribs numerous, deflected, those of the several 

 whorls alternating in position. No revolving lines. 



" Aperture about one-third the length of shell ; canal slightly 

 deflected; columellar lip well defined. 



" Length, slightly exceeding a half inch." Heilprin, 1887. 



This species differs from Umatula in being more slender, less angular 

 about the body whorl; the longitudinal ribs are longer, less nodose, 

 not terminating abruptly at the concave subsutural band but sometimes 

 continuing from suture to suture. I have not seen the revolving lines 

 which Whitfield mentions. 



Length, 20 mm.; diameter, 6 mm. 



Occurrence. — Calvert Formation. Plum Point. 



Collection. — Maryland Geological Survey. 



