INVERTEBRATA. 401 



one-twentieth of an inch." This is the commonest species 

 of Pupa. 



PUPA pentodon, (Say.) Length, one-twelfth of an inch. 

 This is a widely-distributed shell. It lives in woods, under 

 leaves, and on the roots of trees. These three species in- 

 habit the mountain. 



YERTIGO ovata, (Say.) "Length, three-fortieths, trans- 

 verse diameter, one-twenty-fifth of an inch." Wide range. 

 "It is somewhat aquatic in its habits." 



PUPA corticaria, (Say.) Length, one-tenth, diameter, 

 one-twentieth of an inch. These minute shells are found on 

 the Alleghany, and its eastern and western slopes. 



FRESH WATER PULMONATA. 



(Family Limniadae.) 



This family is wholly fluviatile. 



PLANORBIS, (Lamarck.) " Shell discoidal sinistral ; spire 

 depressed or concave, exhibiting the whorls above and be- 

 low;" fresh water. Dekay reports, as belonging to New 

 York, and probably Northern and Middle States, the fol- 

 lowing list of species : Planorbis trivolvis, bicarinatus, len- 

 tus, megastoma, (thin, delicate shell,) parvus, corpulentus, 

 deflectus, dilatatus, which " occurs from Massachusetts to 

 Maryland and Ohio." Several of this genus are on the 

 mountain. - 



LIMNEA, (Lam.) "Animal spiral, elongated, or oval." 

 Dekay has catalogued the following species : Limnea catas- 

 copia, ("from Massachusetts to Delaware and West,") fra- 

 gilis, umbrosa, caperata, pallida, megasoma, gracilis, humilis, 

 reflexa, columella, emarginata, (a boreal species extending 

 South,) desidiosa, juglaris, appressa. 



PHYSA, (Drap.) "Animal oval, more or less spiral." 

 Of this genus Dekay reports species heterostropha, planor- 

 bula, cylindrica, elliptica, plicata, obesa, ancillaria, glabra, 

 aurea; elongata. 



34* 



