148 HELICEA. 



P. Gouldii Binn. &c. is the same as Vertigo Goulclii. 

 P. milium GId. is the same as Vertigo miUum. 

 P. modesta Say &c. is the same as Vertigo ovata. 

 P. ovata Gld. &c. is the same as Vertigo ovata. 

 P. ovidum Pf. is the same as Vertigo ovata. 

 P. Parraiana Orb. is the same as Bui. marginatus. 

 P. simplex Gld. &c. is the same as Vertigo simplex. 

 P. unicarinata Bin., vol. i., is the same as Macroceramus pon- 

 tificus. 



Subgenus VERTIGO. 



Stimpson, 1851, Shells of N. E., p. 53, separates this 

 group from the Helicidae, considering the want of lower 

 tentacles sufficient to form a family of Vertiginidae. 



VERTIGO GOULDII Binney vol. ii. p. 333, pi. Ixii. fig. 2. 



Vtrtigo Gouldii Stimpson, Shells of N. E., p. 53, absq. desc. 

 Pupa Gouldii Ciiesinitz, ed. 2, p. 124, pi. xvi. figs. 20-23.* 

 Pfeiffer, 1. c. iii. 557. 



VERTIGO MILIUM Gould vol. ii. p. 337, pi. Isxi. fig. 1. 



PujHi jnilium Pfeiffek, 1. c. iii. 559. 



Chemnitz, ed. 2, p. 119, pl. xv. figs. 39-42. 



VERTIGO OVATA Say vol. ii. p. 334, pl. Ixxi. fig. 4. 



Vertif/o ovata Say, (Binney's ed.) p. 26. 



Fitjja ovata Chemnitz, ed. 2, p. 118, pl. xiv. figs. 1, 2; xv. figs. 35-38. 



Pfeiffek, Men. Hel. Viv. ii. 360; iii. 558; Symb. ii. 54. 

 Pupa modesta Say, (Binney's ed.) p. 32, pl. 74, fig. 5. 

 PujMi ovulum Pfeiffee, olim, Symb. i. 46. 



Adams (1. c.) considers these two species distinct. 

 Found also in Mexico and Cuba, (Pfeiffer.) 



VERTIGO SIMPLEX Gould vol. ii. p. 343, pl. Ixxii. fig. 3. 



Vertigo simplex Stimpson, Shells of N. E. p. 53, (absq. desc.) 

 Pupa simplex Pfeiffee, 1. c. iii. 530. 



* " lu the States of New York, Baltimore, Cambridge." 



