Fig. 543. 



M. campanulata.f 



282 TROCHID.E. 



tencd above ; minutely wrinkled by the lines of growth, and at its 



base marked with very fine spiral lines ; suture well impressed ; 



aperture large, circular, somewhat expanded ; edge 



Fig. 542. sharp and simple, a little reflected at the uml^ilicus, 



•[ which is large and profound, not bounded by an an- 



i gular ridge ; operculum horny, multi-spiral. Length, 



M. heiicina. ouc fifth of an lucli ; breadth, nearly three tenths of 



an inch. 



Found abundantly on all our sandy beaches. In 

 some seasons, however, I have looked for them al- 

 most in vain. Their proper habitat is the deep sea, 

 as they are thrown up alive, on the large leaves of 

 Laminaria. Tliey were received by Leach and Beck from Green- 

 land, Baffin's Bay, and the Arctic Seas. I have obtained them of a 

 much larger size than is given by any other observer. 



It is a very pretty shell, generally iridescent, or reflecting a me- 

 tallic, bronze lustre. It has more the aspect of a land or fresh-water 

 shell than that of a sea-shell. It is not likely to be confounded 

 with any other species except the following. 



I have given this species as the M. arctica, Leach, in accordance 

 with the opinion of Mr. Sowerby, who compared our shells with the 

 authentic specimens in the British Museum. 



I must confess, also, that in comparing the descriptions of M. vvl- 

 g-aris and 31. arctica in the " Malac. and Conch. Magazine," and 

 specimens of M. vulgaris, sent me by Mr. Sowerby with small speci- 

 mens of the above-described shell, I can perceive no essential dis- 

 tinction, excepthig in size ; the first is said to be palish, the second 

 olivaceous. 



[It is now referred to the Turbo helicinus of Fabricius. 



Margarita argentata. 



Fig. 174*. 



Shell depressed, conical, of a pearly-white color, covered with microscopic, re- 

 volving lines; umbilicated. 



Margarita argentata, Gould, Inv. 1st cd. 256, fig. 174*. — Stimpson, Check Lists, 4. 



Shell minute, conical, with an olituse tip, of a dead pearly-white 

 color ; composed of four convex whorls, the last of Avhich is very 



t rifr. .543 represents the allied species i\f. campaiuilotn, Morse, nsuallv confounded wi;h 

 M. arctica. It appears not to have been recognized by Dr. Gould. — W. G. B. 



