184 SYSTEMATIC PALEONTOLOGY 



Family BUCCINID/E. 



Genus CHRYSODOMUS Swainson. 



Chrysodomus patuxentensis n. sp. 

 Plate XLVII, Figs. 2, 3. 



Description. — Shell small, fusiform, five-whorled ; spire short, body 

 whorl f the length of the shell ; whorls carinated at about the middle by 

 a broad revolving ridge, flat and straight below the ridge, slightly slop- 

 ing above it — thus giving the whorls a strongly turreted appearance; 

 whorls of the spire with one raised revolving line immediately below the 

 suture, one or two fainter ones between that and the shoulder, and two 

 stronger ones above the suture ; body whorl with the same revolving lines 

 and 12-18 additional revolving lines below them and on the beak; entire 

 surface covered with numerous fine, sharp, regular lines of growth 

 which bend at the shoulder ; beak long, slightly bent ; columella concave ; 

 aperture narrowing below. 



There is great variation in the relative prominence of the different 

 revolving ribs, and in the angularity at the shoulder. This is especially 

 true of the Plum Point specimens. 



Length, 16 mm. ; diameter, 8 mm. 



Occurrence. — Choptank Formation. Jones Wharf. Calvert For- 

 mation. Plum Point. 



Collections. — Maryland Geological Survey, U. S. National Museum, 

 Cornell University. 



Genus BUCCINOFUSUS Conrad. 

 This genus was established by Conrad in 1868 with Fusus farilis as 

 the type. Among the species which Conrad referred to it at that time is 

 F. herniciensis King which is the type of Trosclielia Morch, 1876, and 

 Boreofusus Sars, 1878. It is difficult to understand on what ground 

 Fischer considers Buccinofusus a synonym of Troschelia. 



BucciNOFUSus PARiLis Courad. 

 Plate XLVII, Fig. 4. 



Fhsux cinereus Conrad, 1830, Joixr. Acad. Nat. Sci. Phila., voL vi, 1st ser., pp. 211. 



223. 

 Fusus parilis Conrad, 1832, Fossil Shells of the Tertiary, No. 1, p. 18, pi. iv, 



fig. 2. (Reprint, 1893.) 



