116 NEW- YORK FAUNA MOLLUSCA. 



This species, apparently belonging to the Monotigma of Gray, was obtained by Dr. C. 

 Stillman on the shore of the East river, near the city, after a storm. It resembles exceedingly 

 the Pyramis striatula of Couthouy ; but it differs specifically by its deeply sculptured furrows, 

 and its tooth-like fold, from the genus. 



Odostomia fusca. 



PLATE XXXVI. FIG. 342. 



(STATE COLLECTION.) 



Pyramis fusca. Adams, Bost. Journal Nat. Hist. Vol. 2, p. 282, pi. 4, fig. 9. 

 Jaminia id Id. lb. Vol. 3, p. 337. 



Odostomia id. Could, Invertebrata of Mass. p. 270, fig. 176. 



Description. Shell small, subelongate, conical. Spire truncate obtuse ; whorls six, convex ; 

 suture strongly impressed, and with a revolving line below it, causing it to appear double. 

 Aperture broadly ovate, acutely angular above, dilated in the middle. Fold on the pillar-lip 

 far within, occasionally double, and in some cases obsolete ; an umbilical indentation about 

 the middle of the left lip. 



Color. Epidermis shining brown. 



Length, 0-15- 0" 25. 



Specimens of this shell have been presented by Dr. Stillman, who obtained them by dredging 

 in the East river opposite Newtown creek. They were originally found on the coast of 

 Massachusetts. 



(EXTRALIMITAL.) 



O. producta. (Jaminia id. Adams, Bost. Jour. Vol. 3, p. 322, pi. 3, fig. 8. Pl. 31, fig. 296 of this 

 book.) Shell conic-cylindrical: whorls eight, nearly flat ; columella flexuous. Allied to O. fusca, 

 but more slender. Color, dusky horn. Length, 0» 25. Coast of Massachusetts. 



O? exigua. (Jaminia id. Couthouy, Loc. cit. Vol. 2, p. 92, pl. 2, fig. 7. T. bisuturalis, Say, Ac. 

 Sc.Wol. 2, p. 244. Pl. 31, fig. 294, 295, var.) Shell minute, ovate, conical, smooth, with a 

 single revolving line below the suture : aperture oval, subumbilicated. Color, light green; epidermis 

 brownish. Length, 0*15; width, 0*05. On decaying wood near the shore. Massachusetts. 



A variety of this species (fig. 295), with more rounded volutions, and a very faint trace of umbi- 

 licus, is occasionally found on our coast. 



Genus Vermetus. Animal vermiform : head not very distinct, and furnished with a proboscis, pro- 

 vided at its extremity with many series of hooks ; two conic and slightly flattened tentacles 

 with the eyes at their external base; foot cylindrical, with two long filaments in front. Shell 

 conic, tubular, spiral at the apex, irregularly and loosely twisted towards the aperture, which 

 is sharp and continuous : opercle horny. 



