238 Illinois State Laboratory of Natural History. 



side nearly or quite in contact between the abdominals and 

 marginals. Head large, with gular barbels. Digits 5-4, fully 

 webbed. 



Plastron moderately wide. Wings o£ the abdominal plates 

 wide, with a deep groove behind. Head large, with a rhom- 

 boidal plate above Cixosternum. 



Plastron narrower. Wings of abdominal plates narrow, not 

 grooved behind. Head of moderate size, with no plate 

 above Aromochelys. 



CiNOSTERNUM, Spix. 



ISpix [Kinosternon] Kanse et Testudinis brasiliensis species novae, 



1825, p. 17. 

 Wagler, Nat. Syst. Amph., 1830, p. 137. 



Carapace elongate, convex, smooth. Plastron moderately 

 large, rounded before, truncate or slightly emarginate behind. 

 Wings of abdominal plates wide, with a groove behind. In- 

 guinal and axillary plates with the wings of the abdominals 

 forming the bridge between plastron and carapace. Digits 5-4, 

 fully webbed. Head large, with a large rhomboidal plate above. 

 Tail with a terminal nail. 



Cinosternum pennsylvanicum, (imel. Mud Tortoise. 



Testudo pennsylvanica, Gmel., Syst. Nat. 1788, 1., p. 1042. 

 Cistudo pennsylvanmi , Say, Jour. Acad. Nat. Sci. Phila., 1825, 



IV., pp. 20t), 216. 

 Testudo pennsylvanica, LeC, Ann. Lye. Nat. Hist. N.Y., 1829, 



III., p. 120. 

 Cinosternon pennsylvanimim, Dura. et. Uibr., Erp. G(5n., 1835, II., 



p. 3»>7. 

 Kinosternon. pennsylvanicum, Holbr. N. A. Herp., 1842, 1., p. 127, 



pi. 21.— De Kay, Nat. Hist. N. Y., I., Zool. III., Kept, and 



Amph., 1842, p. 21, pi. II., fig. 4. — LeC, Free. Acad. Nat. 



Sci. Phila.. 1854, VII., p. 1S3. 

 Cinosternum pennsylvanicum, Davis and Kice, Hull. 111. State 



Lab. Nat. Hist. I., No. 5, 1883, p. 54; Bull. Chicago Acad. 



Sci., 1883. 



