BOTHREMYDID&. 113 
mesoplastron continued to the midline. This is not probable. The mesoplastron evidently 
extended inward only to the change in the direction of the anterior border of the hy poplastron; 
that is about one-third the distance from the peripherals to the midline. 
The inguinal buttress is prominent, but thin. The hinder lobe narrowed rapidly, so that, 
while aout 150 mm. wide at the inguinal notch, it was only about 120 mm. at the hypo- 
xiphiplastral suture. The thickness of the bone behind the inguinal notch is 4 mm. Only a 
fragment of the right xiphiplastral is preserved. It extends fac the midline to the free border 
along the anterior end; backward to behind the scar for the pubis. The free border was acute. 
The ischiadic scar is elevated, 28 mm. long, and 11 mm. wide. 
The surface of the plastral bones shows no sculpture. On the entoplastron may be traced 
sulci bounding laterally and posteriorly the intergular scute. Its anterior boundary can not be 
made out. On the xiphiplastron is seen the femoro-anal sulcus, 18 mm. behind the front border 
at the midline; 26 mm. toward the free border. 
No. 1471 of the American Museum of Natural History is referred provisionally to this 
species. The specimen was one of the Cope collection and accompanied another specimen 
that was labeled as coming from Barnesboro, Gloucester County, New Jersey. Without 
doubt it came from the Upper Cretaceous. It consists of the right epiplastron (fig. 106), a part 
of the left epiplastron, a portion of the left hyoplastron, a part of the left hypoplastron, and a 
few other fragments. The individual was nearly as large as the type of 7. molops, and there- 
fore considerably larger than the type of 7. le slianus. ee plastral bones are thin, the thick- 
ness of the hinder end of the epiplastron being 8 mm., that of the hyoplastral border near the 
axilla,g mm. They are thinner than most of the corresponding bones of the type of 7. lon- 
nines. a considerably smaller individual. 
The epiplastron measures, in a straight line from the epiplastral symphysis to the hyo- 
epiplastral suture, 86 mm. The length of the symphysis is 20 mm.; the greatest width of the 
epiplastron is 37mm. An abrupt ridge 
at the symphysis increases the thick- 
ness to 10 mm. The free border is 
subacute for a short distance on each 
side of the midline; elsewhere, obtuse. 
Most of the free border of the hyo- 
plastron is obtuse. 
The entoplastron had a width of 
close to 70 mm.; it was probably not 
over 60 mm. long. The thickness of 
the hyoplastronimmediately behind the 
entoplastron is 6 mm. 
The fragment of hypoplastron ex- 
tends along the midline go mm. This 
suture was very jagged. At a ridge 
on the upper surface near the front of this bone the thickness amounts to 12 mm. Posteriorly 
it becomes reduced to 5 mm. Of the hyohypoplastral suture there is present 110 mm. 
The hinder bone was somewhat overlapt by the hyoplastron. 
The inferior surface of these bones shows little sculpture. Only faint traces are seen of the 
network of grooves present in most of the species of the genus. On the hypoplastron are seen 
some faint grooves running at right angles with the median longitudinal suture. 
About certain of the anterior sulci there is some doubt. Those which appear to be present 
are represented in fig. 106. There is some doubt about the first sulcus represented on each 
side of the midline. Probably there ought to be a sulcus drawn across the anterior end of the 
entoplastron, but since this bone is missing we can not determine this. There is certainly a 
gulo-humeral sulcus across the epiplastron, ana a humero-pectoral across the front ends of the 
hyoplastrals. The abdomino-femoral sulcus crost the hypoplastron 39 mm. behind the 
hyohypoplas‘ral suture. Mainly on account of the thinness of these bones they are refer red 
to J. leslianus; for there are no parts common to this specimen and the type. The parts ot 
the hypoplastra present hardly coincide. No. 1471 was considerably larger. 
Fic. 106.—Taphrosphys leslianus. Anterior lobe of 
plastron. 3. No. 1471 A. M. N. H. Known 
bones shown by stippling. 
8 
