INVERTEBRATA. 399 



used as food, medicine, agents of telegraphic communication, 

 and stand as the general symbols of utter beastiality in the 

 doleful region of . 



Of the family of Lamacidae, Binney makes four genera, 

 namely, Yaginulus, Tebennophorus, Arion, and Limax, and 

 affirms, "we have, then, not even one genus which is un- 

 questionably indigenous to our territory." The mountain 

 has the following genera and species : 



TEBENNOPHORUS caroliniensis, (Bosc.) This is a very 

 common slug in the deep forests on decayed wood and bark, 

 where it is often four inches long. 



LIMAX campestris, (Bin.) Found in the forests and 

 among rocks and logs. Binney remarks : " From its wide 

 distribution, it would seem to be indigenous." 



Family HELICID^. Snails. The animals of this group 

 have shells, are herbivorous and carnivorous, and are found 

 within the tropics, as well as temperate regions, but are more 

 abundant in hot climates, decreasing in frequency in tem- 

 perate and frigid regions. Some of the genera are north- 

 ern, some southern exclusively. The family incline to forest 

 residences, domiciliating on fallen leaves, trunks, branches, 

 and rocks. 



SUCCINEA. Small shells like snails, but shorter, " ovate 

 conic, generally amber-colored, thin, translucent," and they 

 are found over every part of the temperate zone. Habits, 

 like the genus Helix. Succinea obliqua, (Say.) Wide 

 range. S. avara, (Say.) Common. S. ovalis, (Gould.) (?) 



HELIX. These animals have been called cosmopolite, 

 from the universality of their diffusion. They occupy every 

 part of the United States, and are abundant in Pennsyl- 

 vania. They inhabit the forests of the mountain in great 

 numbers ; live on vegetables, hiding under logs, bark, leaves, 

 stones, and grass, and affecting darkness and dampness. 



The following species are found in Pennsylvania, and 

 many of them on the Alleghany, including its eastern and 

 western bases : 



