198 CYLINDRA. 



C. Sinensis, Reeve. PL 51, figs. 668, 610. 



Brownish "white, marked with darker brown or nniforni brown ; 



revolving- ridges granose. Length, 1"5-1'75 inches. 



Cliina. 



Distinguished from G. crenulata by its elaborate sculpture. 

 C. lima, Sowerby (fig. dO) appears to be a smaller specimen of 

 the same species. 



C. FENESTRATA, Lam. PL 57, figs. 6*71, 667. 



Thick, rudely folded longitudinally, the ribs sometimes almost 

 obsolete ; crossed by regular, rather narrow revolving riblets and 

 intervening grooves, the riblets become nodulous on the longi- 

 tudinal folds ; color whitish or yellowish, revolving ribs very 

 dark chocolate usually, sometimes uncolored. 



Length, 1-1-25 inches. 



P/iil/p2^i)ies ; Polynesia, in sand, inside coral reefs. 



C. (jians, Reeve (fig. 667) has the revolving ribs uncolored. 

 There can be no doubt of its identity, as in most specimens of 

 G. fenestrata a portion of the whorl next the outer lip is pre- 

 cisely like glans, and a broken specimen before me has been 

 repaired with the orange-brown color characteristic of f/Ians. 



C. PUNCTATA, Swainson. PI. 57, fig. 669. 



Olive-brown, w^horls encircled with engraved, punctate striie. 



Length, 1*25 inches. 



Habitat unknown. 

 This slu'll is unknown in collections. 



C. Nux, Sowb. PI. 57, fig. 657. 



Orange or chestnut-brown, closely lineated l)y incised, minutely 

 piuictured lines and ii'rcgularl}' spotted and clouded with white: 



aperture chi-stnut within. Length, '75 inch. 



JTabttat unknown. 

 Mr. Sowerby has figured l)ut not descril)ed tliis species ; it 

 appears to be distinct, and a very good specimen is included 

 in the Swift Collection in the Museum of the Philadelphia 

 Academy. 



