Pulmonifera of Maine. 



Fig. 7. 

 one long stout denticle merffinj: 



Buccal plate [F'hj.I,) heavj^, arcuate, not 

 tapering at sides, having ten conspicuous 

 ribs which crenulate tlie upper and lower 

 edges of plate ; lines of accretion distinct. 



Lingual membrane 123-44-1-44, central 

 Ijlate long, widening posteriorly, having 

 one denticle as long as plate ; laterals havinr 

 into bidentate uncini, smaller denticle ncai'ly obsolete. (PL 3, FUj. 8.J 



The whole membrane bears a strong resemblance to that of 

 Tebennophorus Carolinensis. 



Mesodon Sayii, Bmney. 

 This species has been found in several localities in the State. 

 J. M. Gould found this species in Aroostook Valley. Mountain 

 sides appear to be its most congenial position. One specimen in 

 my collection exhibited the singular process of two perfect lips 

 formed about one fourth of an inch apart. 



Buccal plate, {FUj. 9, J strongly arcuate, ta- 

 pering at the sides, having from twelve to 

 thirteen longitudinal ribs which strongly notch 

 the cutting edge, and crenulate also the upper 



^^^^- f;,j. 9. 



Lingual membrane 123-42-1-42, central plate narrow at base of denticle which 

 is longer than plate ; laterals long, narrow, and curving inward, having one long 

 broad denticle, merging into uncini which have two long denticles coalescing, 

 extreme uncini tridentate, obtuse. (PL 4, Fig. lO.J 



Mesodon thyroides, Say. 

 Dr. C. T. Jackson catalogues this species in his Report on the 

 Geology of Maine, and as the shells collected by him were sub- 

 mitted to Dr. A. A. Gould for verification, there can be no doubt 

 of the occurrence of this si:)ecies in the State. 



Triodopsis dentifera, Binney. 

 A few specimens were discovered by Mr. John M. Gould at 

 Bethel, Maine, on the Androscoggin river ; they were found high 

 up on a mountain slope, in young birch, in company with M. Sayii. 



Pomatia aspersa, Midler. 

 Dr. Binney mentions the occurrence of this species on the coast 

 of Maine, otherwise than this, I have never heard of its j^resence 

 in the State. 



