Pulmonifera of Maine. 21 



total 3,150. Conuhis chersina stands tlius: 80 rows of plates 37 

 plates ill a row, total 2,960 ; thus we have the palatal membrane 

 longer and narrower in C. chersina. 



VALLONIN^. 



Patula striatella, Anthony. 



Abundant everywhere throughout the State ; I have frequently 

 met with specimens perfectly white. I have received from Rev. 

 E. C. BoUes of Portland a distinct variety of this species collected 

 by him at Waterville, Maine ; they were rather above the average 

 size, the whorls bulging, the usual semi-carination being entirely 

 obsolete, the suture very deeply impressed. In one specimen the 

 last whorl is completely separated from the shell and turns rapidly 

 downward in its revolution. The regular folds or ribs which 

 characterize this species are quite prominent and sharp ; between 

 these ribs the periostraca is marked with irregular rug», which 

 run not only parallel with the ribs but across in every direction, 

 and appear to be governed by no order of arrangment, appearing 

 more like cracks caused by a change in the condition of the per- 

 iostraca; very fine revolving lines are also observable. {PL 2, 

 Fig. 6.) 



Buccal plate (Firj. 48,) arcuate, pointed at sides. 

 marked with diverging striie, cutting edge un- 

 evenly notched or jagged. 



Lingual membrane 100-16-1-16, central plate Fig. 48 



largest, square tridentate, laterals nearly square, bidentate, uncini with two 

 minute denticles. [PL 8, Fifj. 49.) 



Vallonia minuta, Say. {Figs. 54, 55.) 



Found everywhere in abundance throughout the State. In 

 gardens in the City of Portland. 



Buccal plate, (Fig. 56,) wide, narrow, straight, 

 lateral portions slightly bent, longitudinally 

 striate, cutting edge minutely notched. 



Fig. 56. 



Lingual membrane, 73-11-1-11, central plate narrow, notched at outer posterior 

 angles, having three minute denticles ; laterals, three, lozenge shaped, bidentate, 

 outer posterior angle indented ; imcini broad, short, denticulated, (PI. 8, Fig 

 57.) 



