FAMILY TURRINIDZ — TURRITELLA. 113 
TURRITELLA EROSA. 
PLATE VI. FIG. 122. 
(STATE COLLECTION.) 
Turritella erosa. CoutHovy, Bost. Jour. Vol. 2, p. 103, pl. 3, fig. 1. 
Ee id. Goutp, Invertebrata of Mass. p. 267. 
Description. Shell larger than the preceding, turreted, elongate. Whorls nine to eleven, 
rather flat, smooth, sloping towards the suture : from three to five abruptly revolving grooves, 
most prominent and numerous on the lower whorls. Strie of growth wrinkling the shell 
longitudinally. Apex often eroded : aperture circular ; lip thin, and impressed by the termi- 
nation of the coste. Columella with a slight callus and angular base. 
Color. Reddish brown; epidermis sometimes dark lilac. 
Length, 0°5 — 0°8; of aperture, 0°15. 
Found in the stomachs of fishes, on the seacoast of Massachusetts. 
(EXTRA-LIMITAL.) 
. impressa, (Say, Acad. Sc. Vol. 2, p. 244.) Shell with an acute apex: whorls six, with about four 
acute impressed revolving lines; lip not thickened, a slight indentation at its base, and a projection 
within on the middle. Color, dusky. Length, 0-1. Seacoast. 
. equalis. (Say, Jour. Ac, Sc. Vol. 5, p. 208.) Shell subulate. Whorls ten, each with about twenty- 
two transverse elevated obtuse equal lines, with interstitial grooves of the same diameter: suture 
impressed, distinct; aperture rounded at the base, and destitute of any distinct emargination. Color, 
white. Length, 0.2. Seacoast. 
\ alternata. (Say, Ac. Sc. Vol. 2. p. 243.) Shell acute at apex. Whorls eight, with about eight 
unequal revolving slightly elevated lines, maculated with rufous, and decussated by transverse ele- 
vated obtuse lines, obsolete below the middle of the body-whorl, and prominent on the spire. Lip 
not thickened; a slight indentation at the base. Color, whitish ash. Animal with long white 
tentacles, annulate with brown. Length, 0°2. Seacoast. 
‘ concava. (Say, Ac. Sc. Vol. 5, p. 207.) Shell subulate. Whorls more than ten, concave in the 
middle, and sculptured with 2 — 4 obsolete impressed revolving lines, and with an apicial and basal 
band of about fifteen longitudinal undulations on each whorl; the basal band passes round the 
middle of the body whorl. Suture very slightly impressed: canal rather prominent. South-Carolina. 
Fauna — Part 6. 15 
