FAMILY HEUCUXE — PUPA. 51 



nearest the base very small, and placed near the smaller tooth of the columella ; the two 

 others larger, subequal. Umbilicus distinct. 



Color. Whitish horn. Animal with two truncated tubercles, representing the anterior 

 tentacles : foot white ; and head and neck, as far as the mantle, black. 



Height, 0-09. 



This, according to Dr. Eights, is common about Albany and Troy. PL 35, fig. 337, is 

 copied from Gould, to illustrate his curvidens, which is now considered as identical with this 

 species. 



Pupa fallax. 



PLATE XXXV. FIG. 331. 



Cyclostoma marginatai Say, Jour. Acad. Nat. Sc. Vol. 2, p. 172. 



Pupa fallax. Id. Jour. Ac. Nat. Sciences, Vol. 5, p. 121. 

 P. placida. Id. Desci terr. and fluv. shells, p. 24. 



P. fallax. Gould, Invertebrata of Mass. p. 192, fig. 123. 



P. albolabrisi Adams, American Jour. Science, Vol. 40, p. 271/ 



Description. Shell very small, turreted, regularly tapering to a pointed apex. Whorls six, 

 moderately convex, polished, minutely wrinkled. Aperture unarmed, suboval, truncated above 

 by the penultimate whorl, less than one third of the whole length of the shell. Lip white, 

 reflected and thickened. Pillar-lip nearly straight, and turns abruptly at the front so as to 

 form nearly a right angle. Umbilicus small, but distinct. Color, dusky or pale horn. 



Height, 0-2-0-3. 



This animal was first described by Say as a Cyclostoma, under the name of C. marginata. 

 In describing P. fallax, he undoubtedly alludes to this as Pupa marginata, but thinks it 

 differs by its larger size, and its lip not being so widely reflected. Recent American concho- 

 logists have, however, united not only these species together, but have added to them the P. 

 placida of the same author,* as published in a scarce tract now out of print. 



I have not been so fortunate as to detect this species in this State, but I am informed that 

 it has been found here by Mr. Binney. Its present range is from Massachusetts to Ohio. 



* P. placida. (Des. terr. and fluv. shells, p. 24.) Shell pale yellowish horn ; 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. Columella so recurved as almost to conceal the umbilicus : labnim, with the excep- 

 tion of the superior portion, appearing a little recurved when viewed in front, but in profile this is hardly perceptible. 

 Umbilicus very narrow. Height, 0-3. 



Since writing the above, I learn that the original specimen of the P. placida of Say is the Bidimus hordeaceus of 

 Europe. 



