58 new-york fauna — mollusca. 



Auricula denticulata. 



PLATE V. FIGS. 93 & 91. Vabiety. 



(STATE COLLECTION.) 



Valuta detUimlata. MoNTAOn, Test. Britt. p. 234, pi. 40, fig. 5. 

 Auricula personata. Lamarck, An. sans vert. Ed. alt. Vol. 8, p. 334. 

 A. dmticulala. Gould, Invertebrata of Mass. p. 199, fig. 129. 

 A. barealis? Conrad, Jay's Catalogue of Shells, No. 1991-2. 



Description. Shell thin, elongated : apex acute : spire elevated. Whorls eight, more or 

 less convex ; the suture towards the apex being frequently deeper than elsewhere, and render- 

 ing these whorls more convex : often with a marginal line near the lower sutures. Surface 

 polished, with faint incremental lines. Inner lip in the adult with three white folds or teeth ; 

 the lowest formed by the fold of the base of the outer lip ; the middle one largest, and the 

 upper scarcely conspicuous. Umbilicus small, concealed by a fold. 



Color. 5pidermis very thin, and of shining horn or greyish, often amber-colored. Animal 

 yellowish. Foot bilobed in front, and divided across towards the front. 



Diameter, 0-12. Height, 0-3. 



This species appears to live exclusively in and near salt water. I have obtained specimens 

 from the wharves, and others have been sent to me, dredged from the harbor of New- York. 

 The borealis of Jay's Catalogue, of an olive-green color, an elevated apex, and with slightly 

 impressed sutures (fig. 91), with a thin transverse tooth above and a small sinuous tooth 

 beneath, I suppose to be a young variety of the above described species. 



(EXTRALIMITAL.) 



obliqua. (Say, Jour. Acad. Nat. Sc. Vol. 2, p. 377.) Shell obconic, rather thick; spire little ele- 

 vated; whorls 8-9, wrinkled across : pillar-lip with two very distinct teeth, and slighter prominences 

 between them ; lower tooth veiy oblique, terminating at the base; lip with 8 teeth or stricB, termi- 

 nating on the margin ; base of the aperture contracted by the basal tooth, Color, reddish brown. 

 Height, 0"4. Charleston. 



