68 Russell's Familiar Notice of some of the 



sometimes prettily banded. Common on salt marshes, and may 

 be found crawling up the stems of grass. Also washed on shore 

 with Patella alveus, on the sands of Orne's Point, North Salem. 



Journ. Acad Nat, Sc. Phil., vol. ii., p, 245, 



Cabinet of the Society. 



LACUNA. Latin, a furrow. 



PERTUSA. Conrad. Latin, cracked, or having a hole, 

 Shell resembling Turbo or Paludina, having a spire of five 

 whorls, sutures impressed. Columella deeply furrowed, with a 

 profound umbilicus. Found on the beaches of Essex Co. 

 Described and figured in Journ. Acad. Nat. Sc., vol. vi., p. 266, 

 pi. xi., fig. 19. 



Cabinet of the Society, 



NASSA. Latin, Nassa, a bow Net ? 

 OBSOLETA. Say. No obvious signification. 



Whoever has observed the muddy bottoms of our docks and 

 shores at low tide, must have noticed innumerable black shells, 

 slowly crawling, or stationary. These individuals, thus humble 

 in their localities, and devoid of elegance in their habits, consti- 

 tute the species before us. On nearer inspection and better 

 acquaintance they present a tolerable aspect, not wholly wanting 

 in beauty. The aperture is of a deep blue purple, and beneath, 

 the epidermis is a lighter blue tint. Numerous cancellate spots 

 cover the spires. A species so familiar needs but a passing 

 notice. 



Described by Say, in Journ. Acad. Nat. Sc. Phil., vol. ii., 

 p. 232. 



Society's Cabinet. 



NASSA TRIVITTATA. Latin, three fillets. 



Three banded Nassa. 



A much prettier species which I have found only in a dead 

 condition, upon our sandy beaches. Pale yellow or white, gran- 

 ulated, with three reddish bands. 



Lynn and Nahant beaches common. 

 Journ. Acad. Nat. Sc. Phil., vol. ii., p. 231. 

 Cabinet of the Society. 



