83 



Length two-fifths of an inch. Width more than three-tenths. 

 Inhabits Maine. Cabinets of Messrs. Stone, Hyde and Say. 



We are indebted for this shell to Mr. Aaron Stone. It is com- 

 monly invested with a dirty greenish-white pigment, beneath which 

 it is sometimes reticulated with abbreviated yellowish lines, on a 

 brown or dusky ground. 



SCALARIA LINEATA. — Shell brownish, elongated, with about 

 seven volutions ; costa robust, obtuse, little elevated, and from 

 seventeen to nineteen on the body whirl; body whirl with gener- 

 ally a blackish, more or less dilated line, which is nearly concealed 

 on the volutions of the spire by the suture ; margin of the mouth 

 robust, white, more dilated at the columella base. 



Length about half an inch. Inhabits the southern coast. Cabinet 

 of the Academy and the Philadelphia Museum. 



Very much resembles Turho clathratulus of Montague, which is 

 figured by Maton and Rackett as a variety of T. clathrus, (Trans. 

 Lin. Soc. Lond. vol. 8, pi. 5, fig. 1,) but the lip is more robust, 

 and the basal portion of that part is more dilated than the quoted 

 figure of that species. It is possible, however, that it is only a 

 variety of that species. 



TuRRiTELLA ALTERNATA. — Shell dusky; acute at the apex; 

 volutions eight, with about eight unequal, revolving, slightly ele- 

 vated lines, which are maculated with rufous, and decussated by 

 transverse, elevated, obtuse lines, which are obsolete below the 

 middle of the body whorl and prominent on the spine ; labrum not 

 thickened, a slight indentation at its base. 



Length one-fifth of an inch. Inhabits the coast of the United 

 States. Cabinet of the Academy and Philadelphia Museum. 



Animal. — Foot longer than the aperture of the shell, rather 

 acute behind, and truncated a little convexly before ; tentacula 

 filiform, cylindrical, obtuse at tip, nearly as long as the foot, white, 

 annulate with brownish lines ; eye at the external base of the ten- 

 tacula, not prominent ; rostrum about one-third the length of the 

 tentacula ; operculum blackish. 



The shell, when taken from the water, becomes whitish-cinereous. 

 They abound amongst Fiiciis, and sometimes on the shell of 

 Limidus Polyphemus. The animal considerably resembles that of 

 Melania Virginica as respects form, and in common with many 



