320 HELICID^. 



of being thick and flattened. Being so closely allied, 

 these shells should not be separated from each other ; 

 but as they seem to come more properly under this genus 

 than under Bulimus, it is placed accordingly. — [g.] 



3. PUPA ARMIFERA, Sat. 



Plate LXX. Figure 4. 



P. testa albida, cylindracea, obtusa ; anfractibus sex, vel 

 septem, convexis ; apertura sub-ovali, dentibus quatuor 

 armata, quorum unus lamellatus anfractui ultimo, alter 

 columella;, et alteri duo labro, affixi. 



SYNONYMS AND KEFEEENCES. 



Pti])a armifera. Sat, Journ. Acnd. Nat. Sc. II. 162. 



KiRTLAND, Ohio Report, 173. 



Gould, Boston Jocirii, III. 400, pi. 3, f. 10. 



Ada.vis, Vermont Mollusca, 7; Sill. Journ. XL. 271. 



Pfeiffer, Synib. II. 53; Monog. Helic. Viv. II. 357. 



De Kay. New York Fauna, 52. 

 Pupa armigera, Pot. et RIicii., Galerie, I. 1.53, pi. 16, f. 1, 2. 



DESCRIPTION. 



Animal black, superior tentacles long and slender, 

 lower tentacles conical and prominent. Respiratory ori- 

 fice very visible at the angle formed by the junction of 

 the lip Tvith the body whorl. 



Shell cylindrical, sub-fusiform, smooth ; whorls si.x 

 to seven, convex, the three next the aperture of about 

 equal diameter, the posterior three diminishing and form- 

 ing a rather obtuse apex ; suture impressed ; lip white ; 

 thin, sub-reflected, forming the whole outline of the aper- 



