220 FOSSIL TURTLES OF NORTH AMERICA. 
The peripheral appears to be the second of the series. Its length is 116 mm.; its greatest 
width, 66 mm.; and the thickness, 22 mm. This is reduced gradually to the acute hinder 
border. The anterior border is obtuse. 
The length of the costal, omitting the portion of the mb projecting from the peripheral 
border, is 220 mm. The width is 87 mm.; the thickness 11 mm. at the proximal end, 14 mm. 
distally. Proximally the costal articulated with 3 peripherals, as we have found to be the case 
with some of the costals of the Princeton specimen. “The middle and smallest of these neurals 
was crost by a sulcus which divided two vertebral scutes. “This sulcus is 36 mm. long on the 
costal, a fact that indicates that the vertebral scutes were not wide. 
The surface of the bone is smooth, but markt by vascular grooves. The distal border was 
not articulated to the peripherals, except by gomphosis of the end of the rib. 
Genus CHELONIA Brongniart. 
Cheloniide with persisting costo-peripheral fontanels; four pairs of costal scutes; jaws not 
hookt; the grinding-surface of each maxilla with a prominent tuberculated ridge which 
terminates in front in a sharp tooth and which does not extend on the narrow premaxilla. 
Limbs each usually with a single claw. 
Type: Chelonia mydas | Linneus). 
To this genus there is assigned, with doubt, a single species of North American fossil 
turtles. It is ahae called by Cope Puppigerus parvitectus. In the writer’s Bibliography and 
Catalogue, 1902, p. 443, this species and Leidy’s Chelonia grandeva were catalogged under 
the genus Puppigerus; and he would be glad to retain them there were it possible. In that 
work it was stated that the type of Puppigerus was Leidy’s Chelonia grandeva; but the fact 
was overlookt that Mr. Richard Lydekker had, in 1889, chosen as the type of that genus Owen’s 
Chelone longiceps. According to Lydekker, Puppigerus becomes a synonym of Lytoloma Cope. 
It is possible that such 1s er case; but it appears more probable that Puppigerus i is a distinct 
genus, with P. longiceps as its type. The writer can not believe that Leidy’s C. grandava 
is congeneric with P. longiceps and he has for that reason proposed for C. grandava the generic 
name Procolpochelys. Furthermore it is improbable that parvitecta belongs i in the same genus 
as Leidy’s grandava. 
About the only reasons for placing the species parvrtecta under Chelonia are that we thus 
avoid erecting a new genus on extremely insufhcient materials and that we return the species 
to the genus to which it was originally referred, which genus 1s probably not far from the true 
one yet to be establisht. 
On page 143 of the Proceedings of the Philadelphia Academy for 1867, Cope described 
fragments of what he regarded as two species of Chelone; but he applied no specific names to 
these. In the Miocene volume of the Maryland Geological Survey, 1904, page 63, Case has 
copied Cope’s descriptions. Case has also described and figured (op. cit., p. 64, plate xxv1, 
fig. 5) the proximal portion of a scapula which he refers to an unnamed species of Chelone. 
This, as well as Cope’s specimens, was found in the Calvert formation of the Miocene. These 
remains are not generically determinable. 
Chelonia? parvitecta Cope. 
Plate 32, fig. 3. 
Chelone parvitecta, Corr, Ext. Batrach., Reptilia, Aves N. A., 1870, p. 155. 
Chelone parviscutum, Cope, Cook’s Geol. New Jersey, 1868 (1869), p. 738. 
Chelone parviscutatus, Cope, Amer. Jour. Sci. (2), 1, 1870, p. 138. 
Pupptgerus? parvisc utum, Core, Ext. Batrach., Reptilia, Aves N. A., 1870, p. 235, 244. 
Puppigerus parvitecta, Corr, Proc. Acad. Nat. ae 1872, p. 15 
Puppigerus parvitectus, Hay, Bibliog. and Cat. ves Vert. N. A., 1902, p. 443. 
The present species, whose specihe name has been so greatly abused, has as its type a 
single costal plate, which is now in the American Museum oe Natural History and bears the 
Dee 1318. It was found at Squaankum, Monmouth County, New Jersey, and was supposed 
by Cope to have come from the Miocene marl; but this is Lower Eocene. He reported having 
found another costal in Charles County, Maryland. 
