138 SYSTEMATIC PALEONTOLOGY 



TUDIOLA sp. 



Plate XXIII, Figs. 2, 2a. 



Pyropsis [?) sp. Clark, 1895, Johns Hopkins Uuiv. Circ, voL xv, p. 4. 



Pyropsis sp. Clark, 1896, Bull. 141, U. S. Geol. Survey, p. 67, pi. xi, figs. 2a, 2b. 



(?) Pyropsis pyrula Harris, 1899, Bull. Amer. Pal., No. 11, p. 46 (In part). 



Description. — Several casts of a large Tudicla have been found at 

 various localities in the Aquia formation. They differ from T. mary- 

 landica in having a bluntly angulated shoulder. We have not seen the 

 casts from Fort Washington which Professor Harris referred to 

 Pyropsis pyrula but they belong probably to this form. 



Length (of fragment), 40 mm.; width, 55 mm. 



Occurrence. — Aquia Fokmation. Clifton Beach, Aquia Creek, 

 Crownsville, Fort Washington (Harris). 



Collections. — Maryland Geological Survey, Cornell University. 



Tudicla (?) sp. 

 Plate XXIII, Fig. 4; Plate XXIV, Fig. 6. 



Description. — The cast of a small unknown gastropod is very abund- 

 ant in the indurated ledge at Aquia Creek. It has an obtuse, conic spire, 

 varying in height, and a body whorl much expanded at the top, but 

 diminishing in width below. The beak is moderately long, straight and 

 slender. The spire is wound on or slightly below the shoulder of the 

 whorl. The periphery of the whorl is tuberculate. 



An imperfect shell having all these characters was also found at 

 Popes Creek. It has a thick shell and is ornamented with distant, 

 raised, revolving lines. 



Length, 40 (?) mm.; width, 37 mm. 



Occurrence. — Nanjemoy Foemation. Popes Creek. Aquia Forma- 

 tion. Aquia Creek, Clifton Beach. 



Collections. — Johns Hopkins University, Mar3dand Geological Survey.. 



Genus LEVIFUSUS Conrad. 

 Levifusus trabeatus (?) Conrad. 



Fusus trabeatus Conrad, 1833, Fossil Shells of the Tertiary, No. 3 [1st Edit.], p. 2^^. 

 Fusus trabeatus Conrad, 1835, Fossil Shells of the Tertiary, No. 3 [2nd Edit.], p. 53, 

 pi. xviii, fig. 1. 



