48 NEW-YORK FAUNA MOLLUSCA. 



GENUS PUPA. Lamarck. 



Shell small, obtuse at the tip ; the last whorl in the adult narrower or not larger than the 

 others, giving it a cylindrical shape. Aperture semioval or irregular, and modified by teeth. 

 Animal with four tentacles as in the preceding ; but in the smaller species, the anterior pair 

 scarcely apparent. 



Obs. The animals composing this group are generally terrestrial, and usually small ; inhabit 

 moist places among mosses, and under the bark of rotten trees. They may be found abun- 

 dantly in old deserted tanyards, feeding on woody fibres. We are indebted to Messrs. Say 

 and Gould for the best illustration of the American species of this genus. 



Pupa milium. 



PLATE IV. FIG. 44. 



Pupa milium. Gould, Bost. Journ. Nat. Hist. Vol 3, p. 402, pi. 3, fig. 23. 

 P. id. Adams, American Journal of Science, Vol. 40, p. 271. 



P. id. Godld, Invertebrata of Mass. p. 187, fig. 118. 



Description. Shell exceedingly minute, suboval. Whorls four, rather convex, obviously 

 wrinkled ; apex bluntly rounded : suture deep. Aperture half the width of the last whorl, 

 heart-shaped, the apex being its right upper angle: transverse margin nearly direct ; the 

 outer margin scolloped by an indentation of the lip ; remainder of the margin regularly 

 rounded. Lip white, slightly everted. Throat with six teeth, two of which, on the trans- 

 verse lip, equidistant ; one with a tubercle at its base, on the middle of the left lip, and nearly 

 at right angles with the former, is the largest ; a fourth is on the indenture of the outer lip, 

 directed between the two on the transverse lip and two smaller ones more within the shell. 

 Umbilicus large and deep. 



Color. Light chesnut. 



Diameter 0-03. Height, 0-06. 



Found by Dr. Gould (whose description I have adopted) in Massachusetts, and subsequent- 

 ly in Vermont. It will doubtless be detected in this State. Allied to P. ovata of Say ; but 

 that shell is larger, and the semioval aperture with seven teeth. 



