Pulmonifera of 3faine. 11 



are always constant in all our specimens, though more conspicuous 

 in the young. These projections are colorless and spring from 

 translucent areas, slightly elevated from the surrounding surflice, 

 and devoid of the coarse, irregular, and interrupted rugre which 

 mark the periostraca. {Plate 2, Fig. 2.) 



Buccal plate, (Fig. 13J saffi'on color, stout, regularly ^^^^ wrt"/^ 

 arcuate, having six or seven longitudinal folds scalloping ^^Kr |i-^,fe|\)^ 

 both edges of the plate. ^^^^^^^^ 



Lingual membrane 100-28-1-28, central plate quite broad Fig. 13. 



having one large blunt denticle; first five or six laterals having one large denticle, 

 next twelve Avith an incipient outer denticle at the base of larger denticle; uncini 

 irregularly dentated. (PI. 4, Fig. 14.) 



Anguispira. nov. gex. 

 This name is proposed for alternata, as we cannot include it with 

 Patula or Euryomphalus if w^e take H. rotundata as the type. 



Anguispira alternata, Say. 



On some of the islands in Casco Bay this species occurs in the 

 greatest profusion, and though generally distributed throughout 

 the State they are not common. Occurs at Aroostook. Perfectly 

 colorless specimens were found in the hollow of a tree on one of 

 the islands in the bay. The periostraca is very much like that of 

 Patula striatella. 



Buccal plate, (Fig. 15,J arcuate, stout, not wide, of the 

 same length throughout, lateral terminations truncate, strong- 

 ly striate both longitudinal and transverse. 



Lingual membrane 121-34-1-34, central plate wide, with one Fig. 15. 



large denticle shouldered at its base, barely indicating the trace of a smaller 

 denticle, laterals long, angular, having one long wide denticle with a minute 

 denticle at its outer base, uncini small and square, distinctly bidentate, one 

 denticle minute. (PI. 4, Fig. 16.) 



In the lingual membrane of one old specimen which I examined 

 the denticles were Avorn completely away from the first ten rows 

 of plates. 



VITRININ^. 

 Vitrina limpida, Gould. 

 Occurs in the neighborhood of Portland, and on several islands 

 in Casco Bay and vicinity. I met with several si:)ecimens at 



