pupa. 205 



Arizona, at Fort Grant, junction of Arivapa and San Pedro Rivers; Nevada 

 at White Pine : it thus appears to be a species of the Central Province. 



The description and figure are drawn from an authentic specimen. The 

 species is less elongated, more blunt, and has more convex whorls than Pupa 

 fallax. 



Animal unobserved. 



Pupa hordeacea, Gabb. 



Shell rimate, cylindrical, thin, scarcely striate, pellucid, horn-color; spire 

 elongated, apex obtuse ; whorls 5, convex, the last equalling one third the 

 shell's length ; aperture truncate-ovate ; peristome thickened, white, 

 reflected, not continuous ; one twisted, tooth-like, entering, promi- 

 nent fold upon the parietal wall of the aperture, and one prominent 

 upright tooth within the aperture at its base. Length, 2h mill. ; 

 diameter, l mill. 



Pupa horduccti, Gabb, Am. Journ. Conch., II. 331, PI. XXI. Fig. 7 



(1866). 



Pupa hordeacea, W. 0. Binney, L. & Fr.-W. Sh., I. 241, Fig. 417 (1869). 

 Leucochila hordacea, Tkyon, Am. Journ. Conch., III. 300 (1868). 



Arizona, at Fort Grant, junction of Arivapa and San Pedro Rivers; in the 

 Central Province. 



My description and figure are drawn from an authentic specimen. 

 Animal unobserved. 



Pupa armifeua, Say. 



Vol. III. PL LXX. Fig. 4. 



Shell cylindrical, subfusiform, smooth; whorls 6 to 7, convex, the three next 

 the aperture of about equal diameter, the posterior three diminishing and form- 

 ing a rather obtuse apex ; suture impressed ; peristome white, thin, subreflected, 

 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 towards the throat, which 

 is almost filled up by projecting teeth, white within ; teeth commonly 4,, 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 back- 

 ward and downward into the aperture, — it is prominent, 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 aper- 

 ture ; base of the shell, from the umbilicus to the edge of the aperture, com- 

 pressed, fonc'iig a short and obtuse keel ; umbilicus a little expanded, and 

 slightly perforate. Length, 4|, diameter, 2§ mill.; length of aperture, 1| mill. 



