158 SYSTEMATIC PALEONTOLOGY 



are nearly vertical and on the body whorl extend to near the lower 

 end. The spiral lines are numerous and mark the entire volution 

 below the sutural band, but are often stronger on the lower part than 

 above." AVhitfield, 1894. 



The spire is attenuate and the beak short and very slightly curved; 

 suture indistinct; below the suture is a line of tubercles, separated by 

 a concave band from the lower, obliquely ribbed portion of the whorl; 

 sinus below the line of tubercles; surface marked with obsolete, raised 

 spiral lines which override the ribs and are much more distinct on the 

 lower half of the whorl. 



Emmons' species is entirely distinct from this, being more elongate 

 and entirely lacking the subsutural line of tubercles. 



Length, 14 (?) mm.; diameter, 5 mm. 



Occurrence. — Calvert FoRMATioisr. Church Hill. 



Collection. — Maryland Geological Survey. 



Drillia calvertensis n. sp. 

 Plate XLII, Fig. 11. 



Description. — Shell small, slender, nine-whorled; spire high, tapering 

 sharply; body whorl short, with ten to thirteen oblique longitudinal ribs 

 terminating in a concave, subsutural constriction; raised revolving lines 

 fine and close in the constriction, larger and more distant with many 

 finer intermediate ones on the ribbed portion of the whorl; suture dis- 

 tinct, younger whorls overlapping the older; sinus deep, lines of growth 

 sharp. 



Length, 13 mm.; diameter, 4 mm. 



Occurrence. — Calvert Formation. Plum Point. 



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



Section CYMATOSYRINX Dall. 



Drillia limatula Conrad. 

 Plate XLII, Figs. 12, 13. 



Pleurotoma limatula Conrad, 1830, Jour. Acad. Nat. Sci. Pbila., vol. yi, 1st ser., 



p. 224, pL ix, fig. 12. 

 Drillia limatula Conrad, I860, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 561. 

 Drillia limatula Meek, 1864, Miocene Check List, Smith. Misc. Coll (18.S), p. 21. 



