23-i SYSTEMATIC PALEONTOLOGY 



pressed line marks its "uijj^er margin; the other revolves on the upper 

 margin of the whorls; suture j)rofoundly excavated, sides of volution 

 slightly concave; revolving lines rugose, minute." Conrad, 1868. 



Length, 62 mm. ; diameter, 19 mm. 



Occurrence. — Choptank Formation. 2 miles south of Governor 

 Eun, Greensboro (?). Ca.lveet Formation. Truman's Wharf, Lyon's 

 Creek, Plum Point, Chesapeake Beach, 3 miles south of Chesapeake 

 Beach, Eeed's, Skipton, " Huntingtown " {fide Conrad). 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 IT. S. National Museum, Philadelphia Academy of Natural Sciences, 

 Cornell University. 



Turritella ^quistriata Conrad. 

 Plate LVI, Fig. 3. 



Turritella lequistriata Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, pp. 



567, .584. 

 Turritella ceqiiisiriaia Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), 



p. 16. 

 Turritella (equistriata Whitfield, 1894, Mon. xxiv, U. S. Geol. Survey, p. 128, pi. 



xxiii, figs. 12-14. 



Description. — " Subulate, volutions 14, bicarinate, carinse distant 

 with a concave interval, the lower carina near the suture ; surface covered 

 with nearly equal iine closely-arranged striae, with a minute intermediate 

 line; aperture longer than wide."' Conrad, 1862. 



Length, 44 mm. ; width, 12 mm. 



Occurrence. — Calvert Formation. Church Hill, Evans Farm near 

 Church Hill, 3 miles west of Centerville, Plum Point, between McKen- 

 dree and Pin dell. Wye Mills. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Philadelphia Academy of Natural Sciences, U. S. National Museum. 



Turritella plebeia Say. 

 Plate LVI, Figs. 4, 5, 6, 7, 8, 9. 



Turritella plebeia Say, 1824, Jour. Acad. Nat. Sci. Phila., vol. iv, 1st ser., p. 12.5, 



pi. vii, fig. 1. (Reprint, Bull. Amer. Pal., 1896, No. 5.) 

 Turritella plebeia Conrad, 1830, Jour. Acad. Nat. Sci. Phila., vol. vi, 1st ser., p. 211. 

 Turritella octonaria Conrad, 1834, Jour. Acad. Nat. Sci. Phila., vol. vii, 1st ser., 



p. 144. 



