170 SYSTEMATIC PALEONTOLOGY 



Description. — The type is a fragment of the hinder portion of the 

 carapace. The species is closely related to the living Terrapene Carolina. 

 It differs from the latter in having the tenth marginal scute in contact 

 with the fifth vertebral scute. Additional specimens found in the Port 

 Kennedy cave indicate that the shell was also relatively thicker. 



Occurrence. — Cope's type was found on Oxford Neck, Talbot County. 

 He states that it was associated with remains of the mammoth, the elk,' 

 the Virginia deer, and the snapping turtle. 



Collections. — Type in the American Museum of Natural History. 

 The Port Kennedy specimens are in the Philadelphia Academy. 



Family CHELYDRIDAE. 



Genus CHELYDRA Schweigger. 



Chelydea serpentina (Linne). 



Testudo serpentina Linne, 1858, Syst. Nat. ed. x, p. 199. 



Chetydra serpentina Agassiz, 1857, Cont. to Nat. Hist, of U. S. of America, 



vol. i, p. 417. 

 Chetydra serpentina Cope, 1869, Synop. Ext. Batr. Rept. and Aves N. A., 



Trans. Amer. Philos. Soc, vol. xiv, p. 125. 



Description. — Cope, who is the authority for the occurrence of this 

 species on Oxford Neck, Talbot County, does not state what portions of 

 the skeleton were found, and the remains have since been lost. For a 

 general description of the species, see Boulenger's Catalogue of the 

 Chelonians, etc., of the British Museum, 1889, p. 20. 



ARTHROPODA. 



Class INSECTA (Hexapoda). 



Order COLEOPTERA. 



The conditions necessary for the preservation of insects as fossils are 

 very exacting. The greater number of insects are land dwellers, and hence 

 their chance of falling into marine or fresh water deposits is limited. 



