123 



Yar. Of. Shell white, with two revolving reddish-brown dilated 

 lines. 



Length three-twentieths of an inch. Inhabits the coast of 

 the Southern States. Cabinet of the Academy and Philadelphia 

 Museum. 



Animal pale, whitish ; foot linear, nearly as long as the shell, 

 acute behind, hardly larger than the respiratory trunk, truncate 

 before ; trunk more than half as long as the shell, obtuse at tip, 

 with a brown undulation near the tip, and another near the base ; 

 tentacula short, cylindrical, annulate with blackish on the middle ; 

 eyes black, placed on the base of the tentacula. 



Found adhering under stones, fuci, &c., in the bays ; numerous. 

 It varies in color and in markings ; the white sometimes predomi- 

 nates, and reduces the reddish-brown to one or two linear, trans- 

 verse, undulated lines. A variety occurs on the coast of Maryland, 

 which is white, with two or three reddish-brown, irregular-revolv- 

 ing lines. 



FusTJS 10-coSTATUS. — Shell somewhat ventricose, very short, 

 fusiform ; the beak being much shorter than the spire ; with six 

 or seven volutions, which are each obliquely flattened above the 

 shoulder, and spirally ribbed ; these costce are elevated, semicylin- 

 dric, and, with the exception of the two superior ones, equidistant • 

 sutural costge remote from that of the shoulder ; interstitial spaces 

 with small lines parallel to the costse ; the latter are ten in number 

 on the body whorl, three on the second whorl, three on the third, 

 and obsolete on the fourth. 



Length three and three-tenths inches. Greatest width one and 

 nine-tenth inches. Length of the spire one and two-fifth inches. 



This interesting species was presented to me by Mr. Zaceheus 

 Collins, who obtained it from the coast near Boston. The summit 

 of the spire, of two specimens before me, is partially removed, ex- 

 hibiting in the interior a close arrangement of very numerous 

 septse, formed by the animal at different times, as it increased in 

 size, and gradually abandoned the apex. It approaches veiy closely 

 in character to the genus Buccinum. 



Fusus BICOLOR. — Shell short, fusiform ; the beak subequal to 

 the length of the spire ; volutions five, convex, with abrupt, promi- 

 nent, regular, equidistant undulations, which, on the body whorl, 



