NATURAL SCIENCES OF PHILADELPHIA. 307 



'Finest in the Wissahickon and Schuylkill, above the dam." (Tryon.) M. 

 multilineata Say, and the other names, quoted as occurring in this neighbor- 

 hood, are synonyms of the above. 



RlSSOIDjE. 



Leptoxis altilis Lea. Very abundant at Gloucester; also found in the 

 Schuylkill, and in the ditches along Broad street, near League Island. 



Amnicola gran a. Fairmount, Wissahickon, near Chestnut Hill, rare in 

 ditches, south Broad street, with preceding. 



A. lapidaria (Say sp.) Under logs in a moist meadow above Red Bank, 

 N. J. This locality was first pointed out to me by my friend, Dr. G. H. Horn, 

 who discovered this species with several others in abundance. On visiting the 

 spot with him, we obtained in about an hour nearly 300 specimens of this, 

 besides other rare shells. I have never seen this shell from any other 

 locality, though Dr. Leidy informed me that he has occasionally seen single 

 individuals. 



The habitPvt of the animal is curious. Belonging to a genus, all the other 

 species of which, as far as I know, are strictly inhabitants of the water, we 

 found this species in a spot where it could not possibly reach water nearer 

 than a hundred yards, and associated with Helix, Succinea, Carychium, 

 Vertigo, &c. 



A. limosa Say. Wissahickon, near Chestnut Hill, and Delaware River, 

 below Gloucester. " Schuylkill, above the dam." (Tryon.) 



A. 1 us trie a Say. "Wissahickon, above Chestnut Hill, under stones.'' 

 (Tryon.) 



A. porata Say. League Island, in ditches; Schuylkill River, at Fair- 

 mount; Wissahickon, near Chestnut Hill. 



VlVIPARIDwE. 



Vivipara (Paludina) dec is a Say. Most numerous in the Schuylkill, and 

 at the extremity of League Island. Prefers muddy bottoms. Extremely com- 

 mon at all the mill-dams on the Wissahickon. (Tryon.) 



V. subcarinata (Say sp.) Preponderates in the Delaware, especially 

 on the gravelly bottoms of the New Jersey side. Found also in the Schuylkill", 

 but not so common. Very good specimens occur in the Wissahickon. " Kaighn's 

 Point, N. J., very fine specimens." (Tryon.) 



VaLVATIDjE. 



Valvata tricarinata (Say sp.) Rare. Found occasionally in the Wissa- 

 hickon, especially near Chestnut Hill, where it grows quite large. Delaware 

 River, (teste Say.) As far as I am aware, the variety sincera has not been seen 

 in this neighborhood. Mr. Tryon, one of the best collectors in the city, says 

 he has never seen it here. 



HeLICIMJ. 



Succinea oval is Gld. non Say. Abundant in the meadow near Red Bank, 

 mentioned above. 



S. a vara Say. Near the Falls of Schuylkill ; near Manayunk, on the west 

 Side of the Schuylkill; near Red Bank, N. J.; "near Germantown, estate of 

 E. K. Tryon." (T.) 



Achatina 1 u b r i c a Mull Rare. " Isolated individuals west of the Schuyl- 

 kill." (Leidy.) 



1861.] 



