Pxdmonifera of Maine. 17 



Not being able to get a living specimen of this specips to procure the parts 

 above described, I resorted to a specimen received from Cincinnati, Ohio, ten 

 years ago, and by soaking it in water for nearly three hours, the dried remains 

 within the shell were so softened, that with a little diligence and patience I 

 managed to extract the entire lingual membrane and buccal plate. Mention is 

 made of this, that others desirous of securing the dentition of any species of 

 Avhich .they have no living example, can, by pursuing the above course obtain 

 satisfactory results from the exsiccated animal. 



Striatupa. not. gen. 



Based upon peculiarities of dentition as seen in the enormous 

 central plate and the channelled buccal lamina. 



At first sight these might be regarded as specific peculiarities, 

 considering the size of central plate as one of degree only, but 

 we find the buccal plate modified in such a manner as to conform 

 perfectly to this difierence in structure. 



The two following species are united under the above name 

 after a careful consideration of these features. I became acquainted 

 with the dentition of S. milium before 

 I had discovered the species herein de- 

 scribed as '^.ferrea, and had made up my 

 mind as to the value of these difierences. 

 "When therefore I discovered the latter 

 species, I noticed in the appearance of 

 the shell alone its strong specific weight. 

 But still the close similitude it bore to 

 the shell of S. m.iliuni lent it a new 

 interest; and on examining the lingual 

 membrane and buccal plate its generic 

 affinities with S. milium were rendered 

 complete. 



Striatura ferrea, nov. sp. 



(Fig's 36, 37, 38.) 

 Animal dark blue, foot rapidly narrow- 

 ing to an acute point behind. Shell very 

 small, translucent, with a steel grey tinge, 

 not shining : having three volutions, the 

 outer M^horl rapidly enlarging, aperture (Fig's 36, 37, 38.) 



JOUBNAL p. S. N. H, 2 MARCH, 1S64. 



