144 HELICEA. 



PUPA TAPPANIANA Ward, MSS. P. testa minima, pellucida, sub- 

 conica, perforata ; anfractibus quinque ; apertura suborbiculari, 8-den- 

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

 alteris parvis. 



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

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

 impressed 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 

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

 five primary 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 open. 



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. This I retain in justice to Dr. W., who was alike eminent 

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



/ ' 



sustained a severe loss. Subsequently the species was found in Cam- 

 bridge, Mass.. by my friend T. J. Whittemore, 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. 



PUPA PL.ACIDA 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 penultimate volution ; colu- 

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

 the exception of the superior portion, appearing a little recurved 



