150 FOSSIL TURTLES OF NORTH AMERICA. 



measure 48 mm. each, while the concave visceral face is 22 mm. wide. The mouth of the pit 

 is circular. 



Cope referred to this species a specimen which now has the number 2351 of the American 

 Museum and which is regarded here as belonging to the species since described by Wieland 

 as Propleura borealis, here as Osteopygis borealis. If all of the peripherals described by Leidy 

 belong to the same species this can not be the same as Cope's species; for the peripheral here 

 represented by fig. 181 is too long and narrow. Furthermore, the peripheral with the missing 

 costal border is too thick. In the doubt, therefore, it seems best to regard Leidy's materials 

 and Cope's as belonging to distinct species, making the elongated peripheral of Leidy's spec- 

 imens the type of his species and leaving it to future discoveries to determine whether or 

 not any of Leidy's materials are co-specific with Cope's specimen. 



Genus CATAPLEURA Cope. 



A genus not well known. Nuchal bone little broader than the anterior peripherals. 

 Nuchal and first and second peripherals suturally joined to the first costal bone. The other 

 peripherals to the eleventh probably not suturally connected with the disk of the carapace. No 

 pit in the second peripheral for the hyoplastron. A pit in the eleventh peripheral for the rib of 

 eight costal. Plastron probably resembling that of Osteopygis, but not extending so far along 

 the peripherals. 



Type: Catapleura re panda Cope. 



This genus differs from Lytoloma in having the two anterior peripherals solidly joined to 

 the first costal. It differs from Osteopygis in the much narrower nuchal bone and in having 

 no pit in the second peripheral for the process of the hyoplastron. From both Lytoloma and 

 Osteopygis it differs in the much thicker posterior peripherals. 



The genus was establisht by Cope in 1870 (Ext. Batrach., Reptilia, Aves N. A., p. 

 143). On page 235 of the work cited Cope exprest himself in doubt whether there were 

 nine or ten costal plates present. In 1884 (Vert. Tert. Form. West., p. 112) doubt is exprest 

 whether there were 9 costals. There can now be no doubt that this genus, like Osteopygis 

 and the great majority of turtles, had only 8 pairs of costals. 



Catapleura repanda Cope. 

 Figs. 185-188. 



Osteopygis repandus, Cope, Proc. Acad. Nat. Sci. Phila. 1868, p. 147 (num. nud.). Hay, Bibliog. and 



Cat. Foss., Vert. N. A., 1902, p. 441. 

 Propleura repanda, Cope, Cook's Geol. New Jersey, 1868 (1869), p. 755 (nom. nud.). 

 Catapleura repanda, Cope, Ext. Batrach., Reptilia, Aves N. A., 1869, p. 143, plate vii, fig. 2; Vert. Cret. 



Form. West, 1875, p. 259. 



The present species is based on very meager materials and none additional has been 

 discovered since the first description of the species. The type is now in the American Museum 

 of Natural History and consists of a part of the nuchal, the succeeding three peripherals and a 

 part of the fourth of the right side, the first of the left side, and four other peripherals, one 

 nearly complete costal and parts of others, and a portion of a femur. The catalog number is 

 2353. These bones were obtained from the upper bed of Cretaceous greensand at Bameshoro. 

 Gloucester County, New Jersey. 



The nuchal bone (fig. 185) is remarkable for its narrowness fore and aft, being only 47 mm. 

 The widths of the first and second peripherals are respectively 43 mm. and 44 mm. The 

 free border of the nuchal is somewhat obtuse and the thickness soon becomes 10 mm., at 

 the end of the bone. The posterior border articulated suturally with the first costal. The 

 posterior sutural edge is oblique to the surfaces of the bone and the nuchal slightly overlapt the 

 first costal. The thickness of this border is 8.5 mm. The posterior border of the nuchal was 

 much wider from side to side than the anterior border. On the end of the nuchal, nearer the 

 anterior border, there is a notch which receives a process of the first peripheral (fig. 185). 

 The latter measures 50 mm. along the anterior border, 17 mm. along the posterior. Its free 

 border is more obtuse than that of the nuchal. The second peripheral (fig. 185) extends 53 

 mm. along the free border. It is 13 mm. thick near the free border, 7 mm. thick at the hinder 



