Shells found in Essex County. 69 



TRICHOPTERIS. Sowerby. Greek, triche ; hair, bristle. 

 COSTELLATUS. Latin, ribbed. 



Shell ovate, whorls six ; lowest larger and longer, having five 

 or six prominent ribs, with alternate strite, (markings.) Interior 

 brownish. Epidermis, yellowish white : occasionally hairs or 

 bristles occur at the edge of each successive growth, giving the 

 shell a hairy appearance, and suggesting its generic name 

 Might be mistaken for Purpura, but very distinct. 



Described by Couthouy, in Boston Journ. Nat. Hist., vol. ii., 

 pi. iii., fig. 2. 



Jay's Catalogue of Shells, p. 86, pi. i.. figs. 19 and 20. 



Taken off Halfway rock and Nahant. 



Cabinet of Society. ^rN 



BUCCJNUM. Latin, a trumpet. 

 UNDATUM, Latin, ivavy or waved. 

 The Wavy or Undulated Buccinum. 



A fine large univalve, seldom seen in perfection on our 

 beaches, although very fine on the shores of Maine. Shell three 

 or four inches long, ovate conical, ventricose, obliquely furrowed 

 and transversely striated. Aperture of a fine yellow : edge of 

 aperture white. 



Brown's Zool. Text Book, p. 392, pi. Ixxxiv., fig. 14. 



Conchol. " " pi. xi. fig. 14. 



Blainville's Manuel, pi. xxii., fig, 4. 

 Letters to a Young Naturalist, p. 216, (excellent.) 

 Beaches in Essex County, 

 Cabinet of Mrs. Dunlap, Cabinet of Society and my Cabinet. 



PURPURA. Latin, affording a purple color. 



LAPILLUS. Latin, stone. 

 The Stone Purpura or Dog whelk. 



SYN. BUCCINUM LAPILLUS. L. 



The most common white cockle upon the rocky shores of our 

 coast, frequently used by marine anglers for bait, in catching sea 

 perch, (Crenilabrus bergall) varies in color from pure white to 

 brown, yellow and reddish, sometimes black banded, often 

 beautiful. 



