MARyLA.ND GEOLOGICAL SURVEY 18? 



tudinal ribs on the body wliorl ; the columella is callous and more sharply- 

 bent, the canal narrower, especially at the base, where it is bent down and 

 slightly back; the canal and mouth more sharply separated, the body 

 whorl is contracted at the base where it joins the beak. 



liCngth, 100 mm. ; diameter, 47 mm. 



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



Collections. — Maryland Geological Survey, Cornell University, Wagner 

 Free Institute of Science. 



SiPHONALIA( ?) CALVERTANA n. Sp. 



Plate XLVIII, Fig. 2. 



Description. — Shell subfusiform, slender; whorls three-|-, lower part of 

 each straight, upper part sloping at an angle of about 45° with the lower 

 part, angle of the whorl not marked by any distinct shoulder ; mouth long, 

 widest above and narrowing rapidly below into a long slightly l)ent canal; 

 columella smooth, slightly twisted; body whorl with about 40 longi- 

 tudinal ribs which become obsolete below, and about 10 broad revolving 

 ribs with narrower interspaces, together giving the whorl a strongly 

 reticulate appearance; beak with about 10 finer revolving ribs and with 

 no longitudinal ones; spire with less distinct sculpture, the longitudinal 

 ribs passing into crowded rugose lines of growth; first whorl of the 

 nucleus smooth and depressed, second whorl elevated, angular, and differ- 

 ing from the succeeding whorls of the spire only in having very feeble 

 Scalpture. 



Length, 10 mm. ; diameter, 4 mm. 



Occurrence. — Calvert Formation. Plum Point. 



Collections. — Maryland Geological Survey, Cornell University, U. S. 

 N'ational Museum. 



Genus PISANIA Bivona. 

 Subgenus CELATOCONUS Conrad. 



The name Celatoconus was used by Conrad and by Meek as noted 

 below but was not defined by them. The first diagnosis is that given by 

 Dall, in 1892, when he established the subgenus with C. protractus Con- 

 rad as the type. 



