556 



MOLLUSCA 



M. pomum Gmelin (Fig. 871). Length 12 cm.; color yellowish- 

 brown; surface rough; aperture round and yellow in color, the outer 



lip having 3 brown spots: Beaufort, N. C., 

 and southwards; West Indies; common. 



2. UROSALFINX Stimpson. Shell fusi- 

 form, surface roughened by about 12 

 rounded, longitudinal ridges; lip scalloped; 

 aperture with a short canal: 20 species. 



E. cinereus (Say). Oyster drill (Fig. 

 872). Shell 25 mm. long, 15 mm. wide, 

 brown or gray in color, brownish within; 

 whorls 5 or 6, with numerous revolving 1 lines 

 which cross the longitudinal ridges : Florida 

 to Massachusetts Bay, and locally further 

 north, also at San Francisco; very common 

 on oyster beds, being one of the worst ene- 

 mies of the oyster, which it kills by drilling 

 a small round hole through the shell, through 

 which it thrusts its long proboscis. 



3. EUPLEURA Adams. Shell fusiform; surface roughened by about 

 10 longitudinal ridges; whorls 7 and angulated, there being a shoulder 

 beneath the suture: 5 species. 



E. caudata (Say) (Fig. 873). Shell 25 mm. long, 15 mm. wide, 

 brown or gray in color; aperture oval, with a long straight canal; lip 



Fig. 871 



Murex pomum (Rogers). 

 1, siphonal canal. 



Fig. 872 



Fig. 873 



Fig. 874 



Fig. 872 Urosalpinx cinereus (Verrill). 1, siphonal canal. Fig. 873 Eupleura 

 caudata (Verrill). Fig. 874 Purpura lapillus (Verrill). 



thick, roughened within: Cape Cod to west Florida, in shallow water; 

 rather common. 



4. PURPURA Bruguiere. Shell oval, lowest whorl large, with a large 

 aperture, the canal being reduced to a notch at its lower end; columella 

 flattened; outer lip simple: 60 species; cosmopolitan; several species. 



P. lapillus (L.) (Fig. 874). Shell thick, with 5 or 6 whorls; spire 

 acute; whorls with deep revolving furrows; lip arched, with ridges 



