1895.] "^^lO [Cope. 



of the short basioccipital. There is no evidence that any of the rows of 

 teeth of the upper jaw rise from the palatine bone ; they appear to be 

 maxillary in attachment. 



The specimen of Pariotichus aguti on which the above observations are 

 made, possesses, attached to the skull in nearly normal relation, seven 

 vertebrae, a good deal of the scapular arch, and the right humerus. The 

 fifth and sixth vertebrse have slender cervical ribs. The bodies of these 

 with that of the seventh are the only ones whose inferior surfaces are ex- 

 posed. I observe narrow spaces for intercentra between them. Of the 

 scapular arch the clavicle and a median element are preserved. The 

 former has a narrow subvertical portion which rests on the anterior edge 

 of the scapula, and a horizontal portion which is considerably expanded, 

 contracting gradually to the middle line. The median element is T shaped, 

 with the median portion or stem rather slender. It is broken off pos- 

 teriorly so that its apex cannot be described. It underruns the expanded 

 clavicles, and may be therefore supposed to be a cartilage bone and a true 

 sternum, and not an interclavicle. A superficial layer of the exposed 

 part of this element is roughened by sculpture, and probably represents 

 the interclavicle. The inferior layer of the expanded part of the clavicle 

 is similarly sculptured. The humerus has greatly expanded extremities 

 and a slender shaft of moderate length. The form is similar to that of 

 Pariasaurus. There is an angulation of the distal extremity, which repre- 

 sents a condyle. Entepicondylar foramen well developed ; no ectepicon- 

 dylar foramen. 



The species differ as follows : 



I. The long maxillary tooth below the anterior border of the orbit. 

 Head short, wide ; orbit small, half interorbital width ; length of skull 



about 25 mm P. brachyops. 



II. The long maxillary tooth nearer the nostril than the orbit. 

 «• Sculpture reticulate. 

 Interorbital and parietal sculpture reticulate ; interorbital width 20 mm. ; 



interior jaw teeth with round crowns P. incisivus. 



««• Sculpture more or less in longitudinal ridges. 

 Interorbital sculpture in longitudinal ridges ; interorbital width 9 mm., 



equal orbit ; maxillary tusk abruptly longer P. ordinatus. 



Cranial sculpture in longitudinal ridges ; orbit about equal interorbital 

 width ; skull equilateral, straight posteriorly ; length 72 mm. Inner 



jaw teeth compressed P. isolomus. 



Cranial sculpture partly reticulate, especially medially ; orbit about equal 

 interorbital width ; width of skull three quarters length ; outline 



emarginate posteriorly, length 80 mm P. aguti. 



Orbit oval ; cranium 162 mm. long, and nearly as wide ; posterior border 

 emarginate ; muzzle much contracted, entirely overhanging symphy- 

 sis mandibuli P. Jiamatus 



