PUPILLA. 135 



Of uncertain position. 

 "Pupa" lata C. B. Adams. PI. 21, fig. 15. 



See vol. 27, p. 246, where the original description of this 

 species is repeated, and it was referred with a mark of doubt 

 to the genus Columella. The unique type is here figured. It 

 is imperforate, yellowish corneous, slightly translucent, very 

 shortly cylindric with conic summit. The high first half- 

 whorl is smooth, the rest delicately costulate, the riblets low, 

 very narrow with wide intervals, stronger on the upper part 

 of the spire, on the last whorl stopping abruptly at the weak 

 angulation which bounds the smooth, rather flattened base. 

 There are nearly 4 rather strongly convex whorls. The aper- 

 ture is oblique. Peristome is not in the least expanded and 

 is thick for so small a shell, its edge smoothly rounded. Colu- 

 mella with an indistinct, closely adnate reflection above. 

 Length 1.9 mm., diam. 1.35 mm. 



It differs from Pupiwma and Columella by the smoothly 

 rounded finish of the lip, and the columella. The riblets are 

 not euticular. I take it to be the embryonic stage of some 

 larger shell, but I have not been able to trace the species. It 

 is not a pupillid snail, in my opinion. No locality further 

 than ' ' Jamaica ' ' is known. 



PUPILLA (Vol. 26, p. 152). 

 PuPiLLA cuPA (Jan). Vol. 26, p. 185. 



A study of the specimens in the Charpentier collection has 

 been made by G. Mermod (Revue Suisse de ZooL, vol. 33, No. 

 17, July, 1926, pp. 577-582). 



The types of Pupa alpicola Charp., two specimens from 

 Mont Gietroz near Fiomay, valley of Bagnes, Valais, are fig- 

 ured, his figures reproduced in our PI. 24, fig. 11. 



Pupa halleriana Charp. agrees with P. cupa, the only dis- 

 tinction mentioned by Charpentier being the presence of fine 

 granulation on the shell. In certain lights such microscopic 

 granulation occurs in the majority of the shells of muscorum, 

 sterri and triplicata. 



