PUPA. 



437 



Fig. 697. 



Pupa armifera. 



Shell cylindrical, smooth ; whorls six to seven, convex ; aperture nearly oval ; 

 teeth commonly four ; slightly perforate. 



Pupa armifera, Say, Journ. Acad. Nat. Sc. ii. 162 (1821) ; Binney's ed. 21. — Gould, 



Bost. Journ. iii. 400, pi. 3, %. 10 (1840) ; iv. 359 (1843). — Ada.ms, Vermont Moll. 



1.57 (1842) ; Sillim. Journ. [Ij xl. 271. — Ffeiffer, Symb. ii. 53 ; Mon. lid. Viv. 



li. 3.i7. — De Kay, N. Y. Moll. 52 (1843). — Binney, Terr. Moll. ii. 320, pi. 70, fig. 



4. — KusTER, in Chemnitz, ed. 2, 57, pi. 7, figs. 17-19. — W. G. Binuey, Terr. 



Moll iv. 142. 

 Papa rtipicola, Pfeiffer, Symb. ii. 55, teste Pfeiffer in Mon. 

 Pupa iirmigcra, Potiez and Michaud, Galerie, i. 159, pi. 16, tigs. 1, 2. 

 Leitcochila armifera, Morse, Am. Nat. i. 667, fig. 35 (1868). 



Shell cylindrical, sub-fusiform, smooth ; whorls six to seven, con- 

 vex, the three next the aperture of about equal di- 

 ameter, the posterior three diminishing and form- 

 ing a rather obtuse apex ; suture impressed ; peris- 

 tome white, thin, sub-reflected, forming the whole 

 outline of the aperture except a small portion of 

 the body whorl, where a thin, testaceous deposit 

 connects its two extremities ; aperture lateral, 

 nearly oval, deep, cup-shaped, and narrowing to- 

 wards the throat, which is almost filled up by pro- 

 jecting teeth ; white within ; teeth commonly four, 

 one of which, affixed to the body whorl, commences 

 at the superior margin of the aperture, near the 

 junction of the peristome and ultimate whorl, and 

 runs backward and downward into the aperture ; it is promi- 

 nent, lamelliform, irregular, has one or more sharp, projecting 

 points, and is sometimes bifid ; another, thick and massive, is 

 situated deep in the throat, and marks internally the place of 

 the umbilicus ; and two others, projecting and tooth-like, are 

 placed on the peristome at the base of the aperture, and point 

 towards the centre of the aperture ; base of the shell, from the 

 umbilicus to the edge of the aperture compressed, forming a short 

 and obtuse keel ; umbilicus a little expanded, and slightly per- 

 forate. Length, four and two thirds mill. ; diameter, two and 

 two thirds mill. ; length of aperture, one and two thirds milli- 

 metres. 



Probably inhabits every State east of the Rocky Mountains. 



p. armifera. 

 Enlarged. 



