ON THE SKULL OF A PARIASAURIAN REPTILE. 155 
10. On the Skull of a Pariasaurian Reptile, and on the 
Relationship of that Type. By D. M.S. Watson, M.Sce., 
F.Z.8., Lecturer on Vertebrate Paleontology in Uni- 
versity College, London. 
[Received December 20, 1913: Read March 3, 1914] 
(Text-figures 1-7.) 
INDEX. pave 
Sfatementiob matenialaused meee meat eee eaten econ ates LOO 
Maseniotiom wir wie SHewIl bo: ase ssdoanoe s00005000000000900008 Gusnic| 298000 156 
IBTAIZCASCD A OPER aca eee En ae Sane COR Lee oO O 
TAL ahem eee Se eee rn) ha OAIREE aA So eathc nt peste 
TRG(0) Basar ba enon bduaen hoa HeLnbb Budeaoeee coaane acommaone ncsnen creado 162 
Relations of bones of cranial roof ...............s0000022-02 168 
“Move STrwulll OF AUPHAORIC, 265 cos'be5008000 90 205 494 100 b690000e doe p9FOR0 CON 165 
Dsorssion OF Hoa Guill ..sccccasccecss bao snanvacnavooqeovademooasasaced IGG 
The Sphenethmoid in early Tetrapods .....................+.. 166 
Nave IS apnemracoerall "ab ead debdoud bends nanadansokae seaeeticus eoubseaeoaa 10%) 
Systematic position and Relationship of Pariasaurus ......... 170 
Diagnostic characters of the Cotylosauria .................... --. 170 
* Comparison of Pariasaurus with other Cotylosaurs ............ 172 
General characters of Deimocephalia ...............00208 sce eee eee ees 175 
iss Fri ANTOTAOMOIMHES caecatensccoocd0n coopeocesaceene LG 
3 45 “ Therocephalia”’ and “Cynodontia”’... 176 
3 ex IDROTIARAMIND, scoocavcascgoave0 adasonasoedo “6c 177 
Diagnostic characters of the Therapsida .................--:.220-+ 178 
Comparison with the Pelycosauria.........22..:.2:0ss:see sere reese 178 
Comparison of Pariasaurus with the Therapsids ............... 179 
AGIAO WTOC RSTNETILID  copccsocs asa econo ado osoobeonsosocboucosobscbccasoonen IED 
In 1838 Andew Geddes Bain discovered, on the Blinkwater 
Commonage, in Cape Colony, the skull and a good deal of the 
skeleton of a large reptile, which was subsequently described by 
Owen as Pariasaurus serridens. Our knowledge of the structure 
of the animal remained very slight until H. G. Seeley, in 1888, 
deseribed a skull and axial skeleton referred to Pariasaurus 
bombidens *. Some years later he obtained in South Africa a fine 
skeleton, and the imperfect skull and axial skeleton of another, of 
which he gave a good description. 
In 1893 E.'T. Newton gave an excellent account of the skull of 
Elginia mirabilis, a closely allied reptile from the Upper Permian 
Culties Hillock Sandstone of Elgin. 
A.S. Woodward, in 1898, published a diagram of the palate of 
Pariasaurus, which he correctly interpreted. Broom, in several 
papers, has added to our knowledge of Pariasawrus and allied 
types; and J. Versluys has corrected his account of the palate. 
_. * Tt is almost certain that P. bombidens is not congeneric with P. serridens. As 
this paper is purely morphological I have postponed all discussion of nomenclatural 
“difficulties to a more fitting occasion. 
