I- Ml DID I . 



3 6 3 



Taylor. We learn from the American Naturalist (vol. \i\, 1885, p. 1208) that this gentleman 

 had collected materials for Professor Cope in the Equus beds, in the region about San Diego. 

 Ibis locality is about So miles south of that which fumisht the type of T. marnochi. 



The catalog number of the San Diego specimen is 3936. The matrix was a mixture of 



in .i\ el and sand. 



It is assumed for the present that the specimen referred to belongs to T . marnochi. The type 

 is spoken of as being large. Unfortunately Professor Cope gave no measurements. The length 

 of the carapace of the San Diego specimen is 215 mm.; the breadth is 141 mm. The width 

 is therefore two-thirds the length, indicating an elongated form. T. ornata, ot Kansas, is 

 nearly as wide as lung. T . major, of Louisiana, is relatively elongated, but even here the 

 width is three-fourths of the length. The outline of the carapace is like that ot T. major, the 

 hinder portion being only slightly wider than the middle. The width at the line of the hinge 

 is 137 mm.; at the seventh peripherals, 147 mm. The height is 95 mm., two-thirds the width. 

 The middle of the back is rather Bat. There are traces of a dorsal keel anteriorly, and these 

 traces are better defined on the area of the third vertebral scute, and are yet perceptible on the 

 fourth. On each side of this keel, on the third and fourth vertebral scutes, there is a distinct 

 broad, but shallow, channel. Most of the area of the fifth scute is concave. 



The margins of the carapace are little flared upward, far 

 less than those of T. major. A distinct keel runs along each 

 side, joining the anterior free border of the carapace with the 

 hinder free border. 



The individual was an aged one, and the sutures between 

 the bones are completely obliterated. 



The sulci are everywhere deeply imprest. The vertebral 

 scutes are unusually narrow. The table herewith presents the 

 dimensions of these scutes. The lengths are taken along the 

 midline; the widths are the maximum. 

 The anterior end of the first vertebral projects forward between the first pair of marginals. 

 Similarly the anterior ends of the third and fourth vertebrals project forward each into the 

 hinder bolder of the scute in front. The marginal scutes are large. The first rises 22 mm. 

 from the free border, the sixth 23 mm. above the lateral keel, and the ninth 27 mm. above the 

 free border. 



464. 464a. 465.: 



Figs. 463-465. Terrapene canaliculata. Portions of the type. X 



4'.;. Fourth right peripheral, with sections "f the ends (a, anterior; b, posterior). 



464. Region of seventh and eighth marginal scutes, with section (a). 



465. Entoplastron and section (a) of harder of hinder lobe. 



Terrapene canaliculata Hay. 

 Figs. 463-465. 



Terrapin, canaliculata, Hay, Bull. Amer. Mus. Nat. Hist., XXIII, 11)07, p. 850, figs. 5-7. 



The fragmentary remains that testify to the former existence of this species belong to the 

 U. S. National Museum, having been sent there many years ago by Dr. J. P. Scriver. Thev 

 had been found on either \\ hitemarsh or Skedawav Island, below Savannah, Georgia. The 



