250 



LAND AND FRESH- WATER SHELLS OF N. A. [PART L 



margin ; peristome thickened, not reflected ; umbilicus a little open. 

 Length 2, diameter 1 mill. ; aperture 5 long. 



Pupa gouldii, Binney, Proc. B«st. Soc. Nat. Hist. I, 105 (1843) ; Terr. 



Moll. II, 332, pi. Ixxi, f. 2.— Gould, Bost. Journ. Nat. Hist. IV, 352, 



pi. xvi, f. 9 (1843).— Pfei.ffer, Mou. Hel. Viv. II, 358 ; Kijster in 



Chemnitz, ed. 2, 124, pi. xvi, f. 20-23. 



Vertigo gouldii, Stimpson, Shells of N. E. 53 (no descr.). — W. G. Binkey, 



Terr. Moll. IV, 148.— Morse, Amer. Nat. 1, 6(J9, f. 60 (1868). 

 Isthmia gouldii, Morse, Journ. Portl. Soc. I, 38, f. 95, pi. x, f. 96 (18G4). 



From Maryland through New England. 



Jaw scarcely arcuate, of equal size 

 throughout, ends rounded, anterior sur- 

 face with longitudinal lines and trans- 

 verse striae ; concave margin simple, no 

 jawoirer<!(/o^oKWu. [AiousE.] median projection. 



Lingual membrane with 75 rows, each 

 row containing 23 (11 — 1 — 11) short and stout teeth; centrals 

 tricuspid ; uucini serrated. 



Fisr. 436. 



Fi?. 437. 



^g)©0©lS/ 



Lingual deutitiuu of Vtiligo guiildii. [Morsi;.] 



Vertigo 1>ollesiana, Morse. — Shell minutely perforate, cylin- 

 drical ovate, delicately striated, subtrans- 

 Fig. 438. lucent; apex obtuse; suture well defined; 



whirls four, subconvex ; aperture suborbicii- 

 lar, somewhat flattened on its outer edge ; 

 with five teeth, one prominent and rather 

 curved on the parietal margin, two similar 

 in form, the lower one the smaller, on the 

 columellar margin, and two slightly elevated 

 Vi.rii(jo lo'.lesiana. lamelliform teeth within and at the base; 



peristome subreflected and thickened. Length 

 .Oi35 inch; breadth .035 inch. (Morse.) 



