112 PROCEEDINGS OF THE ACADEMY OF [Mar., 



2. Chelydra serpentina (Linnaeus). Plate I, fig. 5; II, fig. 5. 



Two young snapping turtles were brought out of the swamp and 

 at the time were not carefully examined, but were suppo.3ed to be 

 young of the alligator snapper. On comparison with similar-sized 

 representatives of Chelydra serpentina taken at Ithaca, N. Y.-, they 

 prove to be identical with the northern specimens. They are without 

 the scalloped anterior margin of M. temminckii young, as represented 

 by Agassi z^ and do not possess the striking papillae of the young 

 of the alligator snapper. The orbits are directed outwards and 

 upwards as in C. serpentina and wholly unlike the condition in the 

 large skull of M. temminckii secured in the swamp. Furthermore, 

 no supramarginals appear in the carapace. The specimens are 

 small, the larger having a shell 1| inches long by 1^ inches wide. 

 A brief description may be given as follows: 



Carapace grayish-black; very rough; three distinct ridges, the 

 central highest; vertebral plates distinctly serrate at edges, inclined 

 to overlap, each plate roughly bifid posteriorly; marginal plates 

 thick, narrow, edges smooth anteriorly, strongly toothed posteriorly. 

 Plastron acute posteriorly; black with white marginal markings. 

 Head gray, skin tuberculate, white spot below angle of mandible 

 on each side. Neck black, skin loose and wrinkled. Legs black, 

 unmarked. Skin of head, neck, legs and under surface of body 

 gray or black, rough and finely tuberculate. Tail long, black, 

 spiny above, smooth below, gradually narrowing to apex. 



3. Cinosternum pennsylvanicum Bosc. Plate II, fig. 3. 



It is one of the common turtles of the swamp, found l^oth on land 

 and in the water. These turtles were often seen in the shallower 

 waters of the lakes and in the ponds on the islands and frequently 

 on the higher portions of the wooded areas where they came to 

 deposit their eggs. 



The specimens collected showed practically no variation in struc- 

 ture or coloration, and the adult as represented in the Okefinokee 

 fauna may be briefly described as follows: 



Carapace smooth and comparatively high; uniform dark brown 

 in color without markings, but occasionally with fine obsolete indented 

 lines; marginal plates narrow, brown above and reddish-yellow 

 below with brown markings on under side; both extremities of 

 carapace obtusely rounded. Plastron loosely hinged, not com- 

 pletely covering fleshy parts, especially posteriorly, deeply notched 



" Natural History of the United States, Vol. II, Part III, Plate V, Nos. 23-27. 



