186 ANIMALS OF THE SEASHORE 



Columbella avara Say 

 ( .1 na c/iis avara Say) 



PLATE XVIII, Fig. 5 



A slender shell about Vi* inch long; upper 

 whorls smooth, lower ones undulated; yellowish 

 white in color. Fairly common in sandy associa- 

 tions from 3 to 25 fathoms; not found in the inter- 

 tidal zone or in the inland waterways. Known from 

 Massachusetts to Florida. 



Columbella lunata Say 



(MUrella Janata Say; Astyris lunata Say) 



Fig. 28 E 



Less than y± inch in length; reddish brown 

 with circular rows of white spots or "half moons". 

 ( /ommon on sea weed, etc. from low tide to 10 

 fathoms or more, particularly abundant on the 

 hryozoon Bugula turrita in a large area of 3 to 6 

 fathoms depth off Wildwood and Cape May. 



Nassa obsoleta Say (Mud Snail) 



( Xa.ssai ias obsoleta Say ; Aleetrlon obsoleta Say) 



Fig. 30 A 



This small (1 inch) black snail is exceedingly 

 abundant on mud Hats from between the tides to 

 a lout L } fathoms, occasionally deeper; usually found 

 in inlets or in brackish water, never in the open 

 ocean; the mud fiats along Delaware Bay are almost 



