198 CYLINDRA. 



C. SINENSIS, Reeve. PI. 51, figs. 668, 670. 



Brownish white, marked with darker brown or uniform brown ; 



revolving ridges granose. Length, 1 -5-1 '7 5 inches. 



China. 



Distinguished from C. crenulata by its elaborate sculpture. 

 C. lima, Sowerby (fig. 670) appears to be a smaller specimen of 

 the same species. 



C. FENESTRATA, Lam. PL 57, figs. 671, 667. 



Thick, rudely folded longitudinally, the ribs sometimes almost 

 obsolete ; crossed by regular, rather narrow revolving riblets MI id 

 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. 



Philippines ; Polynesia, in sand, inside coral reefs. 



C. glans, 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 glans. 



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



Olive-brown, whorls encircled with engraved, punctate stria*. 



Length, 1'25 inches. 



Habitat unknown. 



This shell is unknown in collections. 



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



Orange or chestnut-brown, closely lineatod by incised, minutely 

 punctured lines and irregularly spotted and clouded with white : 



aperture chestnut within. Length, '75 inch. 



Habitat unknown. 



Mr. Sowerby has lio-mvd but not described (his species; it 



appears to be distinct. :md a very good specimen is included 



in the Swift Collection in the Museum of the Philadelphia 

 Academy. 



