Zoological Bulletin of the Division of Zoology of the Pennsylvania Department of Agriculture . es besides a very narrowbridge. Claws five in front and four behind, strong, the web betweenthe toes small. These are large turtles of great strength and voracity, chieflyaquatic. Three species are known to science, of which two are foundin America, but only one occurs in Pennsylvania. Species 4. Chelydra serpentina (L.). The Snapping Turtle. This is variously known as the Common Snapping Turtle, theSnapping Turtle, the Loggerhead, Loggerhead Terrapin, Snapper,Alligator Couta, Couter, Alligator Torto
Zoological Bulletin of the Division of Zoology of the Pennsylvania Department of Agriculture . es besides a very narrowbridge. Claws five in front and four behind, strong, the web betweenthe toes small. These are large turtles of great strength and voracity, chieflyaquatic. Three species are known to science, of which two are foundin America, but only one occurs in Pennsylvania. Species 4. Chelydra serpentina (L.). The Snapping Turtle. This is variously known as the Common Snapping Turtle, theSnapping Turtle, the Loggerhead, Loggerhead Terrapin, Snapper,Alligator Couta, Couter, Alligator Tortoise, Serrated Tortoise, Snap-ping Tortoise, Snake Tortoise, Alligator Turtle, Land Turtle, Alli-gator Terrapin and Soup Turtle. We have authority for each ofthese various names in literature at hand. The most common nameis The Snapping Turtle. This is, of course, named from its habit ofsnapping or biting at objects when angered, as it will catch sticksor other objects held toward it and often hold on with bulldog tena-city. There is a common superstitious belief, which of course is not 125. Fig. 3. Common Snapping Turtle, showing carapace {dorsal view), plastron (ventralview of right half) and left side view of shell, with side view of head and tail, (One-halfsize original). Drawn by W. R. Walton in Laboratory qf H. A. Surface Harris- 126 well founded, to the effect that it will hang on until thunder is heardor until sundown. The description is as follows: Shell high in front, low behind; carapace with three moderatekeels; margin sharply serrate behind; head large, powerful, not com-pletely retractile; eyes close together, beak hooked; tail with sharp,tubercular crest above, moderate plates beneath, length about equalto shell; plastron small, forming a cross; claws 5-4, web small. Colorof carapace is dark olive or brown, plastron dull yellow. Plates ofcarapace with concentric and radiating grooves, and some radiatingblack dashes. Carapace of young extremely rough, of old, rathe
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