1 56 SYSTEMATIC PALEONTOLOGY 



sulcus; whorls strongly striated at the base; suture undulated; large 

 whorl with strong distant revolving and intervening finer striae. A 

 variety occurs with only one row of tubercles on each whorl, and an 

 impressed line beneath." Conrad, 1830. 



Outline as shown in the figure, spire attenuate, beak of normal length 

 for a Drillia; ten to fourteen oblique longitudinal ribs on each whorl, 

 an impressed revolving line on the crest of the whorl divides them into 

 two rows of tubercles. There are other impressed revolving lines, 

 especially on the body whorl. 



The specimens from St. Mary's Eiver have a more attenuate spire 

 and are more angular than those from Cove Point. They also grade in 

 their character toward var. distans. 



Length 16 mm., diameter 5.5 mm. 



Occurrence. — St. Maey's Formation. St. Mary's Eiver, Cove Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Philadelphia Academy of Natural Sciences, Cornell University. 



Drillia incilifera var. angulata n. var. 

 Plate XLII, Fig. 8. 



Descriptioti. — Spire pyramidal and sharply pointed; body whorl short, 

 angular on the shoulder; beak short, curved; sculptured like that of 

 var. distans. 



Length, 16 mm.; diameter, 5-7 mm. 



Occurrence.— ^T. Mary's Formation. St. Mary's Eiver. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



Drillia incilifera var. distans (Conrad). 

 Plate XLTI, Fig. 9. 



Pleurotoma gracilis var. Conrad, 1830, Jour. Acad. Nat. Sci. Phila., voL vi, 1st ser., 



p. 225. 

 Drillia distans Conrad, 1862, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 285. 

 Brillia distans Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv., p 562. 

 Drillia distans Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 21. 



Description. — "A variety " [of D. incilifera] " occurs with only one 

 row of tubercles on each whorl, and an impressed line beneath." Con- 

 rad, 1830. 



