CHELONIID^:. 217 



of the figures on page ii. These came from Shiloh, Cumberland County, New Jersey. These 

 specimens are now in the American Museum and have the number 1319. The scapula re- 

 sembles that of Caretta, except that the upper end is more flattened. The humerus is now 

 missing from this lot of bones. The radial process is stated to have been on the shaft some 

 distance below the head. The costal plate is 82 mm. wide and 13 mm. thick. This and other 

 fragments of the costals show that these bones were not suturally joined to the peripherals; 

 but also that there was no considerable interval between them, the projection of the rib being 

 short. With this lot is the "nuchal or marginal vertebral" mentioned by Cope. It appears to 

 be the left end of the nuchal. The thickness at the median end of the fragment is 15 mm., 

 that near the junction with the first costal, 21 mm. The first peripheral sent a thin process for 

 some distance beneath the nuchal, near the anterior border. 



Cope mentions another specimen, belonging to the Philadelphia Academy, which presented 

 4 peripherals and a fragment of a hypoplastral. A peripheral, believed to be the third, had a 

 length of about 47 mm., and a width of 21 mm. Cope concluded that the rib of the first costal 

 did not run parallel with the hinder border of the costal, but approacht the hinder border 

 toward the distal end. Another peripheral belonging near the middle of the series was trigonal 

 in section, measuring 59 mm. across the lower face and 45 mm. across the inner, or visceral, 

 face. This and two other peripherals were emarginate at the middle of the outer border. The 

 dermal sulcus crost the peripherals a little behind the middle. 



In the American Museum of Natural History is a lot of fragments labeled by Cope 

 as belonging to this species. The catalog number is 1027; the locality uncertain, but probably 

 in New Jersey. A neural appears to confirm Cope's determination. This neural (fig. 274) is 

 63 mm. long, in the midline of the upper surface and including the process. The width is 

 71 mm.; the thickness, 16 mm. The anterior border is beveled so that the neural was overlapt 

 somewhat by the preceding neural; and the hinder border similarly overlapt the succeeding 

 one. A peripheral, probably the second, is 85 mm. long, 47 mm. wide at the middle of the 

 length, and 20 mm. thick. The outer border is obtuse; the inner, acute (fig. 275). Frag- 

 ments of three other peripherals belonged probably near the rear of the carapace; at least, 

 they have a much narrower visceral face than those described by Cope. One has the upper 

 and lower faces 48 mm. wide; the inner face only 19 mm. The other bones throw little 

 or no additional light on the species. 



In the paleontological collection at Princeton University is a lot of turtle bones that are 

 labeled as having been received in December, 1879, from Mr. George Erety Shoemaker, now 

 of Philadelphia. This gentleman writes that these remains came from a marl bed near Shiloh, 

 Cumberland County, New Jersey. This marl belongs to the Miocene. While there is a large 

 amount of this material, it unfortunately consists of the remains of at least four turtles, belong- 

 ing apparently to 2 genera. It has been found impracticable to separate these satisfactorily, 

 but apparently there are parts of 3 individuals of the present species. 



With these bones are 2 neurals which, it can hardly be doubted, belong to P. grandceva. 

 One of these is 50 mm. long, with a short posterior spine, 48 mm. wide, and 12 mm. thick. 

 To it is attacht the neural arch. Another, a more posterior and smaller one, is 32 mm. long 

 and 44 mm. wide. Two other neurals present are only 8 mm. thick and evidently belong to 

 a quite different turtle. 



There are in the lot, belonging apparently to P. grandceva, at least five proximal ends of 

 costals, and most of these show that they articulated each with three neurals, of which the 

 median one was the smaller. These costals vary in width from 80 mm. to 105 mm. and in 

 thickness from IO mm. to 14 mm. The rib-heads were large. Besides the proximal ends of 

 costals, there are many other portions of these bones. A part of a right first costal requires 

 description. The proximal end is missing. Near the distal end the width is no mm.; the 

 thickness 12 mm. The anterior border articulated with the nuchal and with the first periph- 

 eral, the two sutural borders making between them an angle of about 135. The remainder 

 of the distal border, 65 mm., was free from the adjacent peripheral, the second. Near the 

 hinder border issues the rib, making its way to the pit in the third peripheral. Only a portion 

 of the second costal has been recognized. Another costal, probably the fourth, is represented 

 by the distal two-thirds. The distal end is 133 mm. wide; the other extremity, 1 1 1 mm. The 

 thickness, at a distance of 85 mm. above the free border, is 18 mm.; but at the proximal end 



