10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.71 



sulcus separating the scutes of the two sides runs a very irregular 

 course. 



Terrapene cmmliculata is with the possible exception of T. jmt- 

 mani Hay, from the Peace Creek beds, the largest species of the 

 genus, and certainly the largest Pleistocene form. 



At this time the main distinguishing features of this species are 

 its large size; shell thick and heavy; carapace with its free borders 

 curved upwards; posterior peripherals widely flaring; keel over the 

 bridges connecting free borders of the front and back peripherals; 

 gutter-like groove above this keel; first vertebral strongly urn- 

 shaped with portion posterior to the middle as wide but usually 

 wider than the anterior end; strongly elevated median longitudinal 

 ridge, extending full length of first vertebral; median, keel out 

 interrupted by transverse sulci. 



EXPLANATION OF PLATES 



Plate 1 



Terrapene smgletoni, new species, No. 11,181 U.S.N.M. Carapace viewed from 

 above. Specimen from Melbourne, Brevard County, Florida. About % 

 natural size. 



Plate 2 



Terrapene canaliculata Hay No. 25-144 Amherst College Museum. Carapace 

 viewed from above. Specimen from Vero, St. Lucie County, Florida. About 

 % natural size. 



Plate 3 



Terrapene canalieulata Hay No. 25-145 Amherst College Museum. Carapace 

 viewed from above. Specimen from Melbourne, Brevard County, Florida. 

 About % natural size. 



Plate 4 



Terrapene canaliculata Hay No. 25-145 Amherst College Museum. Carapace 

 viewed from the left side. About % natural size. 



Plate 5 



Terrapene canaliculata Hay No. 11,428 U.S.N.M. Plastron and carapace viewed 

 from the lower side. Specimen from Melbourne, Brevard County, Florida. 

 About % natural size. 



O .' 



