174 DR. A, SMITH WOODWARD ON [June 7, 



(fig. 4). The grooves for the slime-canals must also have been 

 deep and conspicuous, as shown by the same fragment. 



The most interesting feature in the skull, its quadrate bone 

 (figs. 1-3, qu), is well preserved on the left side and exposed from 

 behind. This bone is long and narrow, antero -posteriorly com- 

 pressed, and inclined somewhat backwards. Its inner face is 

 sheathed by a great vertical plate of the pterygoid, while its 

 outer or lateral border is in complete contact with the bones of 

 the cheek. It is quite clear that there was no postero-temporal 

 cleft or vacuity ; and the quadrate bears no impression of the 

 external auditoi-y meatus. 



There are no vacuities in the bony covering of the postorbital 

 region of the cheek, and the limits of some of its constituent 

 elements are well shown by the natural internal mould. The 

 long and narrow ovoid squamosal (figs. 1, 2, sq.) is distinct ; while 

 the outline of the equally elongated and still narrower postorbital 

 (pto.) can be traced without difiiculty. There can also be little 

 doubt that the postf rental {ptf.) and prefrontal {prf.) exclude the 

 parietals and f rontals from the margin of the orbit. The parieto- 

 frontal region, however, cannot be satisfactoiily interpreted. 

 It seems probable that the parietals {p>ci-), which must have been 

 relatively large, taper rapidly in front, where they extend nearly 

 to the anterior border of the ortit. They must also have been 

 either depressed or thickened in the median portion, where their 

 anterior end articulates with the very narrow pair of frontals 

 ifr.) — suggesting an arrangement nearly like that represented by 

 Cope in the skull of C'ricotus *. The prosquamosal {psq.) is an 

 irregularly triangular plate, somewhat longer than deep, with 

 the apex forwards. The quadrate- jugal (qj.) is nearly twice as 

 long as its maximum depth. The jugal (j.) is especially elon- 

 gated and forms the greater part of the infero- external border of 

 the orbit (orb.), which is oval in shape and directed both laterally 

 and upwards. There are also some traces of the edge of the 

 postfrontal {pff.), prefrontal {prf.), and lachrymal {la.) bones, 

 but the raiddle part of the rostrum is lost. An internal mould 

 of nearly the terminal portion of the snout (figs. 6, 7) demon- 

 strates the slenderness of this region and the elongated shape of 

 the "asal bones {na.). 



The palate is of the typicallj^ Labyrinthodont pattern, with a 

 complete parasphenoid (fig. Q, pas.), which is laterally compressed 

 in its middle portion. The large posterior lamina of the ptery- 

 goid, in a vertical plane, abutting on the quadrate, has already 

 been mentioned. In front of this expansion the pterygoid of 

 each side curves outwaixls to meet the jugal (and probably also 

 the hinder end of the maxilla) in a long suture. Its extent 

 anteriorly is uncertain owing to the absence of the middle of the 

 rostrum. Further forwards the palatines (fig. 6, p)l.) are rather 



* E. D. Cope, I'l-oc. Amer. Pliil. Soc. vol. xvii. (1878), p. 529. 



