PUPA. 145 



when viewed in front, but when viewed in profile, this reeurva- 

 ture is hardly perceptible ; umbilicus very narrow. 



Length over three tenths of an inch. Inhabits Massachusetts. 



For this shell I am indebted to Dr. T. W. Harris, of Milton, 

 from whom I have received many intei'esting species of our more 

 northern regions. At first view it might be mistaken for the P. 

 marginata Nob., but it is quadruple the size, and the labrum is 

 not reflected and thickened. 



SYNONYMS AND REFERENCES. 



Pujmplacida Say, (Binney's ed.) p. 39. 

 Pupafallax DeKay, N. Y. Moll. p. 51. 



Gould, Invert. 192. 

 Pupafallax (i Pfeiffer, Men. Hel. Viv. ii. 309. 

 Bulimus Jiordeanusf DeKay, 1. c. 

 Bulimus obscurus Gould, Men. Pupa, p. 17. 



Pfeiffer, iii. 350, on DeKay's authority. 



Remarks. This will probably always remain a doubt- 

 ful species, since those having the best means of deciding 

 upon it have not been able to agree. I therefore simply 

 give Say's original description. 



PUPA RUPICOLA Say vol. ii. p. 341, pi. Ixx. fig. 1. 



CarycMumf rupicola Say" (Binney's ed.) p. 22. 



Pupa rupicola Chemnitz, ed. 2, p. 123, pl. xvi. figs. 17-19. 



DeKay, N. Y. Moll. p. 52. 



Pfeiffer, 1. c. iii. 557; nee Symb. ii. 55. 

 Pupa procera Chemnitz, p. 58, pl. vii. figs. 20, 21. 



Pfeiffer, 1. c. ii. 360. 

 Pupa carinata Gould, 1842, Boston Journ. iv. 1, cover, p. 3. 



Pfeiffer, I. c. ii. 359; iii. 557. 

 Pupa ffibbosa Chemnitz, ed. 2, p. 123, pl. xvi. figs. 13-16. 

 Pupa niinuta (Say-) Pfeiffer, 1. c. ii. 356; iii. 555; Symb. ii. 54. 

 Vertigo rupicola Binney, 1. c. 



minuta f Adams, Gen. ii. 172, absq. descr. 



Pupa procera is said to be identical with rupicola by 

 Binney (Boston Proc. i. 105). Gould doubts the correct- 

 ness of this decision (p. 106). DeKay confirms it, as does 

 Pfeiffer in vol. iii. of his Monograph. 



10 



