BOTHRKMYD1D,<E. II j 



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 hypoplastron; 

 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 about 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 from 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 1 1 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 T. molops, and there- 

 fore considerably larger than the type of T. leslianus. The 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, 9 mm. They are thinner than most of the corresponding bones of the type of T. lon- 

 ginuchus, 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 



| -. j XvX 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 hyoplastron immediately behind the 

 entoplastron is 6 mm. 



FIG. U)6.Taphrotphys leslianus. Anterior lobe of The f ragrnen t of hypoplastron ex- 



plastron Xj. No. 1471 A. M. N. H. Known tends a , ong the midline 90 mm. This 

 bones shown by stippling. , . -j 



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 be:omes reduced to 5 mm. Of the hyohypoplastral suture there is present no 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, and a humero-pectoral across the front ends of the 

 hyoplastrals. The abdomino-femoral sulcus crost the hypoplastron 39 mm. behind the 

 hyohypoplastral suture. Mainly on account of the thinness of these bones they are referred 

 to T. leslianus; for there are no parts common to this specimen and the type. The parts of 

 the hypoplastra present hardly coincide. No. 1471 was considerably larger. 



8 



