Perkins.] 120 [October 6, 



MEASUREMENTS. 



Length of shell 4 mill. Breadth 1.6 mill. 

 " foot 1.25 « " .8 « 



" tentacles 1.2 " 



Odostomia dealbata Stiuips., Check List. Chemnitzia dealbata 

 Stimps., Proc. Bost. Soc. Nat. Hist., Vol. iv, p. 114; do., Shells of 

 N. E., p. 41. 



Very rare. I have never found it alive. 



Odostomia fusea Gould, Invert. Mass., p. 270, fig. 176; De 

 Kay, Moll. N. Y., p. 116, pi. xxxvi, fig. 342. Pijramis fusca C. B. 

 Adams, Bost. Journ. Nat. Hist, Vol. n, p. 282. Chemnitzia fusca 

 Stimps., Shells of N. E., p. 41. 



Not uncommon under stones near low water. Animal purple ; ros- 

 trum as long as the tentacles, bilobed at the end ^ tentacles short, 

 tapering; eyes on their inner bases; foot auricled and straight before, 

 rounded behind, whitish below, having a dark line across the front, 

 and for a short distance down each side. The animal often floats on 

 the surface with the extended foot uppermost. 



MEASUREMENTS. 



Length of a small shell 2.8 mill. 



Breadth 1.4 mill. 



" foot 2.2 " 



" 1A u 



" tentacles .6 " 





Odostomia impressa Stimps., Check List. Turritella impressa 

 Say, Am. Conch., p. 84, 1822. Odostomia insculpta De Kay, Moll. 

 N. Y., p. 115, pi. xxxi, fig. 297. 



Not common. 



Odostomia producta Gould, Invert. Mass., p. 270, fig. 175; 

 De Kay, Moll. N. Y., p. 116, pi. xxxi, fig. 296. Jamina producta C. 

 B. Adams, Bost. Journ. Nat. Hist., Vol. in, p. 322, pi. iii, fig. 8. 

 Chemnitzia producta Stimps., Shells of N. E., p. 41. 



Rarer than the preceding, with which it is found. The animal is 

 purple, lighter than 0. fusca; rostrum much expanded, bilobed in 

 front, grooved along the middle; tentacles short, triangular, bases 

 connate behind; foot auricled before, rounded and broader behind. 



Odostomia seminuda Gould, Invert. Mass., p. 273, fig. 178. 

 Jamina seminuda C. B. Adams, Bost. Journ. Nat. Hist., Vol. II, p. 

 .280; Chemnitzia seminuda Stimps., Proc. Bost. Soc. Nat. Hist., Vol. 

 iv, p. 16. 



Very rare. 



