142 SYSTEMATIC PALEONTOLOGY 



''Variety^ C. Destitute of earinations, and probably the young shell. 

 Length about an inch/^ Conrad, 1833. 



Several specimens have been found which are very close to this species. 

 They are nearer the Variety C. suggested by Conrad and named P. ele- 

 gantissima by Lea. 



Length, 27 mm.; width, 12 mm. 



Occurrence. — Nanjemoy Fokmation. Popes Creek. 



Collection. — Maryland Geological Survey. 



Pyeula (?) sp. 

 Plate XXIV, Fig. 5. 



Description. — Shell thin; body whorl large, convex; sculpture of nu- 

 merous, closely set, revolving, impressed lines, very strongly and con- 

 stantly punctate. 



Only one specimen has been found and it is very imperfect. The 

 spire is entirely gone. 



Length (of fragment), 14 mm.; width, 11 mm. 



Occurrence. — Nanjemoy Formation. Popes Creek. 



Collection. — Johns Hopkins University. 



Genus FULGUROFICUS Sacco. 



FULGUEOFICTJS AEGUTUS Clark. 



Plate XXIV, Figs. 3, 3a. 



Fulgur argutus Clark, 1895, Johns Hopkins Univ. Circ, vol. xv, p. 4. 

 Fulguroficus argutus Clark, 1896, Bull. Ill, U. S. Geol. Survey, p. 68, pi. xii, figs. 



la, \b. 

 Fulguroficus triserialis Harris, 1899, Bull. Amer. Pal., No. 11, p. 67, pi. viii, fig. 17. 



(In part.) 



Description. — " Shell moderately short, with four or five whorls; first 

 two whorls apparently smooth; third whorl with faintly impressed spiral 

 lines and minute transverse riblets; later whorls with spinous tubercles 

 at the shoulder; body whorl also with two lower rows of tubercles ar- 

 ranged along strongly elevated spiral ridges and transversely placed 

 vertically above one another; ten to fourteen tubercles in each row; nu- 

 merous fine spiral threads also pass over the spinous ridges and inter- 



