198 SYSTEMATIC PALEONTOLOGY 



callosity which is thickened above, bordering the posterior canal; 

 lower canal channeling the base of the columella within. Surface smooth, 

 polished when entire, but generally eroded, showing under a glass fine 

 lines of growth." ^\liitfield, 1894. 



His specimens do not differ at all from young of B. intcgra from the 

 Maryland localities. 



Length, 23 mm. ; diameter, 12 mm. 



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



Collections. — Maryland Geological Survey, Johns Hopkins University, 

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



BuLLiopsis QUADRATA Conrad. 

 Plate L, Fig. 3. 



Nassa quadraia Conrad, 1830, Jour. Acad. Nat. Sei. Phila., vol. vi, 1st ser., pp. 211, 



2;J6, pL ix, fig. 16. 

 Biiccirmm quadratum Conrad, 1842, Proc. Nat. Inst., Bull, il, p. 187. 

 BuUia {Bnlliopsis) quadrata Conrad, 1862, Proc. Acad. Nat. Sci. Phila., vol. xiv, 



p. 287. 

 Tfitia {Bnlliopsis) quadraia Conrad, 1863, Proc. Acad. Nat. Sci. Pbila., vol. xiv, 



p. .563. 

 Tritia {Bulliopsis) quadrata Meek, 1864, Miocene Check List, Smith. Misc. Coll. 



(183), p. 20. 

 Nassa (Bulliopsis) quadrata Conrad, 1866, Amer. Jour. Conch., vol. ii, p. 6.5, pi. iii, 



fig. 1. 

 Kassa (Bulliopsis) subcylindrica Conrad, 1866, Amer. Jour. Conch., vol. ii, p. 66. 

 Melanopsis quadrata Conrad, 1868, Amer. Jour. Conch., vol. iii, p. 2.59. 



Description. — " Shell turreted ; spire with the whorls rather square, 

 and slightly projecting at the angles; left lip reflected over the columella, 

 and thickened above." Conrad, 1830. 



Length, 23 mm.; diameter, 1 mm. 



Occurrence. — St, Mary's Formation. St. Mary's River. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

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



Bulliopsis marylandica Conrad. 

 Plate L, Fig. 4. 



Buliia (Bulliopsis) Marylandica Conrad, 1862, Proc. Acad. Nat. Sci. Phila., vol. xiv, 



p. 287. 

 Tritia (Bulliopsis) 3Iarylandica Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, 



p. 562. 



