Cope.J t)dO [March 16, 



species, the T. insifjnis. IMr. Cummins, however, now sends me parts of 

 skeletons of four individuals, which present distinctive characters. Two 

 of these include vertebral elements, and all embrace jaws and bones of the 

 limbs and arches. 



The vertebrae present no important difference from those of T. insifjnis, 

 but the surface of the intercentrum is not yet cleaned of a thin layer of 

 matrix. The peculiar character of this species is most readily seen in the 

 posterior portions of the mandibular ramus. The angle consists of two 

 subequal tuberosities which are separated by a deep groove, instead of one 

 prominent one. Tlie external tuberosity is represented in the T. insignis by 

 a small protuberance of the lateral enlargement of the external face of the 

 ramus. The extremity of this tuberosity is in the T. bilobatiis strongly 

 honeycombed, and it is bounded below and externally by a groove which 

 is faintly indicated in T. insignis. Above it, on the inner side, is another, 

 shallow groove, from which it is separated by a sharp ridge. Both grooves 

 are smooth. The superior one is wanting in T. insignis. The quadrate 

 cotylus is more depressed externally than in T. insignis, thus making it 

 more oblique. The internal fossa of the cotylus is not divided by a longi- 

 tudinal groove, as it is in T. insignis The dental foramen is large, and is 

 located as in the T. insignis. There is also an inferior longitudinal groove of 

 the ramus as in that species. The surfaces preserved show that the sculp- 

 ture is more marked in the T. hilobatus than in the T. insignis. 



Measurements. ^[. 



Depth of ramus at interior edge cotylus 026 



Length " from " " " 030 



Width " at " " " 017 



" of both tuberosities of angle 0125 



Diameters of intercentrum | anteroposterior Oil 



I transverse 021 



Thickness of intercentrum 004 



The specimens described came from the same locality, and a ditferent one 

 from that which has produced the specimens of the T. insignis (Type No. 

 39, 1882). 



REPTILIA. 



Pariotichus megalops, sp. nov. 



This reptile is known to me from a nearly complete, somewhat distorted 

 cranium. A thin layer of matrix conceals the greater number of the teeth, 

 so that the presence of canines cannot be demonstrated. Those which are 

 visible are on the premaxillary and anterior parts of the maxillary bones. 

 They are small, conic, slightly curved, acute and absolutely smooth. 



The muzzle is short and broadly rounded. The nareal opening is latero- 

 superior, and is just above the principal convexity where the lores pass into 

 the muzzle. Canthus nostralis rounded off. Interorbital region wide, 

 convex in section, nearly plane anteroposteriorly, its width a little exceed- 

 ing the diameter of the orbit. Orbit large and round, its diameter equal to 



