STROPIIIA. 219 



Linf^ual formula 08 (13 — 1 — 13), with fi porfort laterals; central and lateral 

 bases of attaclimeiit notclicd at outer lowi-r corners; ('(antral square, having 

 three small denticles ; Indented at upper mar- 

 gin ; laterals trieus})i(l, inner denticle largest ; ' c=;=^c=» 



marginals minutely serrate. ^(j^(P^(!^H^^'''''^ 



Referred to V. Moulinsianay Dupuy, hy fry. -^ -^ ''^ -^ 

 r^ _ „ ., ^ „ , „ Lingual membrane of Vfrligo ventricosa 



Gwyn, JelTreys (1. e.), 240. ^^^^^^ 



Vertigo simplex, (iouLD. 

 Vol. III. PI. LXXII. Fig. 3. 



Shell minute, cylindrical, obtuse at apex, smooth, chestnut-color; whorls 5, 

 well rounded, separated by a deep suture ; aperture 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 

 detected in any specimen. Length, 1| mill. ; breadth half as great. 



Pupa simpler, Gould, Bost. Journ. Nat. Hist., III. 403, PI. III. Fig. 21 (1840); 



IV. 359 (1843); Invertebrata, 190, Fig. 121 (1841). — Pfeiffer, Mon. Hel. 



Viv., II. 302. — DeKay, N. Y. Moll., 52, PI. XXXVI. Fig. 347 (1843). — 



BiNXEY, Terr. Moll., II. 343, PI. LXXII. Fig. 3. 

 Vertigo siinplex, Stimpson, Shells of New England, 53 (no descr.). — W. G. BiN- 



NEY, Terr. Moll., IV. 148 ; L. & Fr.-W. Sh., I. 254 (1869). —Morse, Amer. 



Nat., I. 670, Figs. 67, 68 (1868). — Tryon, Amer. Journ. Conch., III. 310 



(1868). — Gould and Binney, Inv. of Mass., ed. 2, 444 (1870). 



Canada and New England, a species of the Northern Region. 



Animal dark gray above, light gray and pellucid below ; foot moderately 

 long, trilobate anteriorly, the middle lobe minute. Eye-peduncles usually 

 clavate, sometimes ver}' decidedly. No tentacles. Shell carried perpendicu- 

 larly, or even inclined forwards. Active in movement. 



Referred to V. edentula, Drap., by Gwyn Jeffreys, Ann. Mag. Nat. Hist., 

 1872, 246. 



Spurious Species of Vertigo. 



Vertigo contracta, AdajJs, Gen. Rec. Moll., is the same as Pupa contracta. 

 Vertigo decora, Adams, Gen. Rec. Moll., is the same as Pupa decora. 

 Vertigo mintUa, Adams, Gen. Rec. Moll., is the same as Pupa rupicola. 

 Vertigo pentodon. Say, is the same as Pupa pent odon. 

 Vertigo rupicola, Binni.v, is the same as Pupa rupicola. 

 Vertigo corticaria, Binney, is the same as Pupa corticaria. 



STROPHIA, Alders. 



Animal heliciform, blunt before, pointed behind ; mantle posterior, pro- 

 tected by a shell ; respiratory and anal orifices on the right of the mantle, 



