EASTERN PROVINCE — NORTHERN REGION SPECIES. 191 



Verti§^o Bolleslaiia* Morse. 



Shell minutely perforate, cylindrical-ovate, delicately striated, sub- 

 translucent; apex obtuse; suture well defined; fig. 193. 

 whorls 4, subconvex ; aperture suborbicular, 

 somewhat flattened on its outer edge, with 5 

 teeth, one prominent and rather curved on the 

 parietal margin, two similar in form, the lower "S^M^'^ 

 one the smaller, on the columellar margin, and rcrtigo Boiusiana. 

 two slightly elevated lamelliform teeth within and at the base; peri- 

 stome subreflected and thickened. Length, .065 inch ; breadth, .035 

 inch. (Morse.) 



Islhmia Bollesiana, Morse, Ann. N. Y. Lyc.,viii, 209, figs. 4-6 (Nov., 1865). 



Vertigo BoUeaiana, Morse, Araer. Nat., i, 669, figs. 63, 64 (1868). — W. G. Binney, L. 

 & Fr.-W. Sh., i, 250 (1869) ; Terr. Moll., v.— Gould and Binney, Inv.,442, 

 fig. 703 (1870).— Tryon, Am. Journ. Couch., ill, pt. 4, 308, pi. xv, fig. 25 

 (1868). 



New England ; New York ;. Virginia. Distribution, therefore, like 

 the last species. 



Animal unobserved. 



Jaw of the same width throughout, slightlj' rounded at the ends; 

 cutting edge without projection, finely striated. 



Lingual membrane with 88 rows of (12-1-12) teeth; base of attach- 

 ment notched at outer posterior corners ; fi,;. 194. 

 square, widening posteriorly, armed with ^r=a'^'*"* 

 three minute denticles, central one largest; /^-^^^-^ 



Lingual membrane of Vertigo 



laterals having two minute denticles apart, BoiUsiana. (Morse.) 



outer denticle nearly obsolete; marginals scarcely notched. 



A comparison of this description and figure of dentition with that of 

 Lehmann (Plate XIY, Fig. 53) will prove that this species cannot be 

 identical with P. pygmcea, of Europe, as has been suggested by Mr. 

 Gwyn Jefireys (Ann. Mag. Nat. Hist., 1872, 246). 



Vertigo simplex, Gould. 



Shell minute, cylindrical, obtuse at apex, smooth, chestnut-color; 

 whorls 5, well rounded, separated by a deep suture ; aperture fig^i95. 

 circular; the peristome nearly continuous, simple or scarcely 

 everted, except at its columellar margin, where it partially 

 conceals a small umbilicus ; no trace of a tooth has been de- 

 tected in any specimen. Length, If'""' ; breadth, half as 

 great. 



