148 HELICEA. 



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

 P. milium Gld. is the same as Vertigo milium. 

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

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

 P. ovulum 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 Helicidse, considering the want of lower 

 tentacles sufficient to form a family of Vertiginidae. 



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



Vertigo Gouldii STIMPSON, Shells of N. E., p. 53, absq. desc.. 

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

 PFEIFFER, 1. c. iii. 557. 



VERTIGO MILIUM GOULD vol. ii. p. 337, pi. Ixxi. fig. 1. 



Pupa milium PFEIFFER, 1. c. iii. 559. 



CHEMNITZ, ed. 2, p. 119, pi. xv. figs. 39-42. 



VERTIGO OVATA SAY vol. ii. p. 334, pi. Ixxi. fig. 4. 



Vertigo ovata SAY, (Binney's ed.) p. 26. 



Pupa ovata CHEMNITZ, ed. 2, p. 118, pi. xiv. figs. 1, 2; xv. figs. 35-38. 



PFEIFFER, Mon. Hel. Viv. ii. 360; iii. 558; Symb. ii. 54. 

 Pupa modesta SAY, (Binney's ed.) p. 32, pi. 74, fig. 5. 

 Pupa ovulum PFEIFFER, 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, pi. Ixxii. fig. 3. 



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

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



* "In the States of New York, Baltimore, Cambi-idge." 



