248 INVERTEBRATA OF MASSACHUSETTS. 



occasionally, but Professor Adams has found it in great numbers 

 along the southwestern shore of East Boston. 



It is clearly described, and accurately fio;ured by Montagu, but its 

 generic place is very doubtful. It is allied to Delphi'nula, and 

 Brown, in his " Conchology of Great Britain," &c., figures several co- 

 species, and embraces them in a genus which he calls Delphinoidea. 

 The genus Skenea, of Fleming, is adopted in preference, because its 

 characteristics have been described. 



Genus SCALARIA, Lin. 



Shell turreted, spire long, composed of rounded, sometimes sep- 

 arated lohorls, crossed by elevated ribs ; aperture oval ; lip con- 

 tinuous^ reflected. 



Scala'ria Nov-A'ngli^. 



Shell white, lohorls convex, and barely in contact ; ribs numerous, 

 slender, unequal, and with numerous^ flne, revolving lines, in 

 the intervening spaces ; umbilicated. 



State Coll., No. 48. Soc. Cab., No. 2410. 



Scalaria Nov-Anglife, Coutfiouv ; Bust. Joioji. JVat. Hist., ii. 96, pi. 3, f. 5. 



Shell turreted, elongated, thin, of a glossy white-color, with 

 here and there an irregular rusty blotch ; whorls ten, cylindrical, 

 barely touching each other, crossed by eleven somewhat oblique, 

 delicate bars, of a pure white-color, three or four of which, on 

 the lower whorls, are more robust than the rest ; the bars do not 

 cross the sutures, and each has a little spine at its posterior termi- 

 nation. The space between the ribs is thickly marked with very 

 fine revolving lines, which are also crossed by still finer ones ; 

 aperture nearly circular, bordered by a robust rib, with a spine 

 like the others, flattened so as to form a blunt angle at its anterior 

 portion, and partially concealing a small umbilicus. Length j\ 

 inch, greatest breadth \ inch. 



Only one specimen has as yet been found, and this was taken 

 from the stomach of a fish caught, off Cape Ann, by Mr. 

 Couthouy. 



