MAMMAL-LIKE REPTILES. 755 
ethmoid is received in a groove on the lower surface of the 
frontals (and parietals?) and extends so far backwards that it 
nearly, if not quite, touches the supraoccipital. 
The interparietal (I. Pax.) is a flat bone entirely on the back of 
the skull, where it overlaps the supraoccipital below and the tabu- 
lares at the sides. The rest of its front face is in contact with 
the hinder ends of the greatly thickened parietals. 
The tabulare (TaB.) is a large bone forming a good deal of the 
occipital surface. It is wedged in between the postorbital and 
interparietal (R. 3594), and passes outwards above the post- 
temporal fossa to touch the outer end of the paroccipital. The 
outer part of its front face is in contact with the squamosal, and 
its thick outer border joims with this bone to make a distinct 
auditory meatus. 
Text-figure 5. 
r, 79> 
ul! 
Bk 
te )-au. 
Prigation oweni, gen. et sp. n. 
Right lateral aspect of the type-skull. R. 3596 B.M.N.H. X }. 
Reterence-letters as before. 
The squamosal (S@.) is a large bone which has a powerful arti- 
culation with the end of the paroccipital process; above the arti- 
culation a strong ramus runs inwards along the front face of the 
tabulare to overlap the postorbital. Immediately to the outside 
of its articulation with the paroccipital process the bone overlaps 
the upper end and some of the posterior surface of the quadrate. 
Finally, the bone is completed by a powerful ramus which forms 
part of the outer wall of the skull, articulating with the lateral 
border of the quadrate and ending in suture with the quadrato- 
jugal, jugal, and postorbital. 
None of the specimens shows clearly all the sutures bounding 
