Fam. 57.] NATURAL HISTORY SOCIETY. 139 



L. 8; D. 3; in. 12°; Wh. 10; Ap. J.— Mass. and south. Not 

 rare. 



2. Turbonilla elegans, Ver. Shell elongated, slender acute; 

 whorls well rounded ; suture rather deep ; surface somewhat 

 shining with numerous longitudinal ribs which are not oblique, 

 and fine revolving grooves interrupted by the ribs ; the lower 

 half of the body-whorl has only the revolving lines ; aperture 

 broad oval ; outer lip thin, sharp. Epidermis thin, light-yellow. 

 L. 9; D. 2J; An. 18; Wh. 10; Ap. J.— Mass. and south. 



2. Syrnola, A. Ad. 



Shell subulate, straight, virteous, banded, polished; whorls flat; 

 suture impressed; aperture oblong, inner lip obliquely plicate in 

 the middle. 



i. Syrnola prodiida, C.B. Ad. Shell conic-cylindrical ; whorls 

 nearly flat ; tip blunted, as if one or more whorls were removed ; 

 columella flexuous ; no umbilicus. Epidermis light-brown. L. 

 6; D. If; An. 12°; Wh. 8 or more ; Ap. J.— Mass. to N. J. 



2. Syrnola fusca, V. B. Ad. Shell subelongated, conical, thin 

 and horny ; spire obtuse ; whorls slightly convex ; suture 

 strongly impressed ; aperture broad, acuteh^ angular above, and 

 dilated in the middle; fold on the pillar lip far within, or obso- 

 lete; an umbilical indentation about the middle of the inner lip. 

 Epidermis shining-brown. L. 6 ; D. If ; An. 25° ; Wh. 6 ; Ap. J-. 

 —Cape Cod to N. J. 



3. Odostomta, Flemg. 



Shell conical elongated ; aperture ovate ; lips disunited pos- 

 teriorly, and sometimes produced in front ; i)illar with a tooth- 

 like fold. Operculum horny, indented on the inner side. 



1. Odostomia bisuturalis, Say. Shell ovate-conical, apex rather 

 obtuse; whorls flattened, with almost always an impressed line 

 revolving below the suture, making it appear double ; columella 

 with an obtuse fold. Surface smooth, light-green under a brown- 

 ish epidermis. L. 5 ; D. 2^ ; An. 35° ; Wh. 5-6 ; Ap. J.— Mass. 

 to N. J. Common under stones at low water. 



2. Odostomia trifida, Tot. Shell acutely pointed, smooth and 

 glossy ; whorls flat, with about 6 impressed, revolving lines; the 

 one above and the next two below the suture much more dis- 

 tinct, making three characteristic lines at the suture ; pillar lip 



