214 FOSSIL TURTLES OF NORTH AMERICA, 
peripheral bones; but he also exprest doubt whether these bones might not rather belong 
to the rear of the carapace. Among the bones in the lot mentioned there is none that can be 
recognized as a bone belonging in the midline. Fragments are found which, when fitted 
together, furnish fig. 271. The: bone markt by 1 is certainly that called by Cope the first 
marginal. It seems impossible to determine just where it belonged. It is, for various reasons, 
improbable that it belonged in front. Hence, assuming that Cope had a symmetrical bone 
which joined the supposed first peripheral, the latter is here taken to belong behind and to 
be the last left peripheral. 
Cope estimated the length of the bone 1 to be 153 mm. It is not known whether he took 
account of the narrow fragment on the right of the figure; but there is no doubt that this 
fragment belongs where it is placed. 
ak The length of the bone then, not includ- 
ing a deeper plate on the right that 
sould be hidden when the hone joined 
the one next to it, is 165 mm. The 
greatest width, omitting a deep sutural 
: 7 plate, is 100 mm. The thickness on the 
\ a wale y right side is 27mm. The greatest thick- 
ness is to the left of the middle of the 
length and is 45 mm. Cope states that 
this is the thickness nearthe suture of the 
second peripheral; from which expres- 
sion we may infer that the narrow frag- 
ment on the left of the hgure, markt 2, 
is a part of the penultimate peripheral. 
The free border of the bone 1, so far as 
represented, is thick and obtuse. Fig. 
271 gives a section froma to 6. The free 
Fic. 271.—Lembonax insularts. Fragments of two bones 
F : ete od 
of the carapace, with section of one. Type. . Lenierotens bone,on the left, projected 
a to b, direction of section. 1, probable last peripheral; in an obtuse angle. It appears improb- 
2,iprobable penultimate peripheral, able that such’ an irregular border 
would be found on the front of the carapace. The upper surface is convex and undulating 
but there is no definite sculpture. ‘Toward the free border the surface is pitted and rough. 
Seen from below the bone is concave. Near the hinder border of the narrow fragment on 
the right is a prominent ridge. A suspicion is awakened that this is the fragment which Cope 
mentions as bearing the support of a vertebra. The ridge mentioned continues for some 
distance on the larger part of the bone of which the fragment is a part. Behind it, on the 
larger fragment, are two equally prominent ridges, followed by some smaller ones, and these 
are separated by deep grooves. What is the meaning of these grooves and ridges can not be 
determined. It is possible that the median bone, whether nuchal or pygal, sent a process 
along the under surface of the bone 1, two-thirds its length. 
The bone shown on the left of the one indicated by 1 has a thickness of 33 mm.; and it 
is possible that this is a part of what Cope called the nuchal. In that case the bone 1 would 
be either the right ultimate peripheral, or first left peripheral. 
As in the case of L.? propyleus, it is impossible to state with certainty that this species 
belongs to the genus Lembonax. 
Lembonax? propylzeus Cope. 
Fig. 272. 
Lembonax propyleus, Corr, Proc. Acad. Nat. Sci., Phila. 1872, p. 15. 
Lembonax prophyleus, Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 444. 
The type of this species is now in the American Museum of Natural History, and has 
received the number 1310. This specimen was found in the Eocene greensand, in the vicinity 
of Farmingdale, ie aioush County, New Jersey, the same formation and locality that furnisht 
the type of F the genus, L. polemicus. 
