J40 JOURNAL OF THE NEW JERSEY 



with a single, sharp, oblique fold. Ivory or soiled white. L. 5 ; 

 D. 2; An. 23°; Wh. 8; Ap. J— New Jersey and north. Com- 

 mon under rocks and stones. 



3. Odostomia seminuda, C. B. Ad. Shell acute-conic, with 

 coarse, revolving lines crossed by longitudinal ones, giving the 

 surface a granulated appearance, except the lower half of body- 

 whorl, which has only revolving lines ; outer lip thin and scal- 

 loped by the revolving lines. Glossy white, translucent. L. 4 ; 

 D. 2 ; An. 30° ; Wh. 6-7 ; Ap. J — Mass. and south. Common. 



4. Ododomia iwpressa, Say. Body wliorl with ten deeply scul- 

 ptured, revolving lines on the lower half, and five distinct, revolv- 

 ing lines on the upper half; about four on the next whorl, and 

 less on the rest; aperture ovate, acute above, effuse below. 

 Soiled-white, the lines rufous. L. 5; D. If; An. 24°; Wh. 6; 

 Ap. J. — Cape Cod and south. 



Family 58. TRiFORID/E. 



A small family of elongated, turreted sinistral shells repre- 

 sented by the genus : — 



1. Triforis, Desh. 



Shell similar in form and sculpture to the Cerithiidse, but 

 sinistral. 



Animal with tentacles club-shaped at the tips and united at 

 their bases by a sinuated veil. 



Triforis perversa, L. var. nigrocincta, Ad. Shell conic-cylindri- 

 cal, with three revolving series of granules ; whorls reversed ; 

 canal twisted, about J as long as the aperture ; reddish black ; 

 columella black ; a black, spiral belt in faded shells. L. 7 ; D. 

 If ; An. 23° ; Wh. 12 ; Ap. i.— Mass. and south. 

 Family 59. CERITHIOPSID/E. 



Shell spiral, elongated, many whorled, frequently with many 



longitudinal ribs ; aperture with an anterior canal and a less 



distinct posterior one; lip generally expanded in the adult; 



operculum horny and spiral. Animal with a retractile proboscis. 



1. Seila, a. Adams. 



Shell elongated, turreted, many w^horled ; aperture small with 

 a crooked canal in front ; whorls flattened and granular, with 

 rounded nodules formed by ridges of growth and spiral lines 

 crossing each other ; operculum subtriangular. Animal with 



