144 Biiiney on Terrestrial Mollusks. 



Pupa Tappaniana Ward, ^ISS. P. testa minima, pellucida, sub- 

 conica, perforata ; aul'ractlbus ([uinque ; apertura suborbiculari, 8-(leii- 

 tata : dente uno columellari, majore, quatiior alteris magnis, tribus 

 alteris parvis. 



Shell very small, pale horn-color, translucent, tapering above tbe 

 penultimate whorl ; whorls a little more than five, convex, with a well 

 im]M'ossed suture ; aperture sub-orbicular, (the penult whorl cutting off 

 about one third of the circle,) about one third of the length of the shell; 

 margin sharp, with a narrow contraction in the sub-margin, beneath 

 Avhich is a thickening within, on which are the labial teeth ; teeth eight, 

 five priniar}' and three secondary ; of the former the largest is on the 

 penultimate whorl, the next largest on the left side of the aperture ; at 

 the base, beginning at the left hand, is a primary, then a secondary, a 

 primary, a secondary, a primary, and another secondary, extending nearly 

 to the upper extremity of the right margin : the last three primaries are 

 not constant in size ; umbilicus o[)en. 



Length, .08 inch; breadth, .05 inch. 



Cabinets of Middlebury College and my own. 



Geographical Distribution. This shell has been found in Ohio, in 

 Massachusetts, near Boston, and in this.place. 



Remarks. This species was discovered by the late Dr. Ward of Ros- 

 coe, Ohio, from whom I received specimens in April, 1840, with the 

 above name. Tliis I retain in justice to Dr. W., who was alike eminent 

 for his attainments and liberality, and in whose sudden death science 

 sustained a severe loss. Subsecjucntly the species was found in ('am- 

 bridge, Mass., by my friend T. J. Whitteniore, Esq., and Dr. Gould. 

 Among some minute shells collected in this town by Mr. M. W. Johnson, 

 of the graduating class of last summer, I have detected this species, but 

 too late for insertion in an article, on the Mollusca of this vicinity, in the 

 next number of the American Journal of Science and Arts, and have 

 therefore published this description separately. 



ri PA PLACIDA Say. 



Shell dextral, cylindric-conic, pale yellowish horn-color ; apex 

 ■whitish, obtuse ; whorls six and a half, somewhat wrinkled ; suture 

 moderately impressed ; aperture unarmed, longitudinally oval, 

 truncate a little obliquely above by the peiuiltimate volution ; colu- 

 mella so recurved as almost to conceal the umbilicus ; labrum, with 

 the exce[)tion of the superior portion, appearing a little recurved 



