MARYLAND GEOLOGICAL SURVEY 371 



Family CYPRIDAE 



Genus BYTHOGYPRIS Brady 



BYTHOCYPEIS CYLINDRICA (Hall) 



Plate LV, Figs. 28-31; Plate LII, Figs. 14-16 



Leperditia (Isochilina) cylindrica Hall, 1872, 24th Rep. New York State 

 Cab. Nat. Hist., p. 231, pi. viii, fig. 12 (Extract 1871, p. 7, pi. iv, fig. 12). 



Bythocypris cylindrica Ulrich, 1894, Geol. Minnesota, vol. iii, pt. 2, p. 687, 

 pi. xliv, figs. 29-35, p. 688. 



Description. " Carapace minute, seldom exceeding two-hundredths of 

 an inch in length, nearly twice as long as wide ; valves very convex and 

 cylindrical, the anterior and posterior ends subequal and strongly 

 rounded ; cardinal line much shorter than the length of the valve ; tubercle 

 obsolete. Surface smooth." Hall, 1872. 



An abundant fossil in all divisions of the Trenton and Cincinnatian 

 rocks of the United States and Canada. 



Occurrence. MARTI:N T SBURG SHALE (Eden division). Southern Penn- 

 sylvania and in the debris from the same on Fairview and Eickard 

 Mountains in Maryland. 



Collections. Maryland Geological Survey, TJ. S. National Museum. 



Superorder CIRRIPEDIA 

 Family LEP1DOCOLEIDAE Clarke 



Genus LEPIDOCOLEUS Faber 

 LEPIDOCOLEUS JAMESI (Hall and Whitfield) 

 Plate LV, Figs. 1-4 ; Plate LII, Figs. 24, 25 



Plumulites jamesi Hall and Whitfield, 1875, Geol. Surv. Ohio, Pal., vol. ii, 



p. 106, pi. iv, figs. 1-3. 

 Lepidocoleus jamesi Faber, 1886, Cincinnati Soc. Nat. Hist., vol. ix, p. 15, 



pi. i, figs. A-F. 

 Lepidocoleus jamesi Ruedemann, 1901, New York State Museum Bull., 



No. 42, p. 521, pi. ii, figs. 10-12. 



Description.-^" General form of the plates triangular, with the apex a 

 little inclined to one side, the lateral margins gradually and rapidly diverg- 

 ing from the initial point, one of them considerably longer than the other. 



