314 MK. T. ATTHEY ON ANTHRACOSATJRTTS RtJSSELLI. 



squamous, and behind the so-called supraoccipitals. The parietal 

 foramen, one-eighth of an inch in diameter, lies at about an equal 

 distance from the anterior and posterior borders of the bones. 



The so-called supraoccipitals are about twice as broad as they 

 are long, united on the median line, bounded by the parietals in 

 front, by the squamous and then the epiotics externally, by the 

 true occipitals beneath the posterior border of the cranium ; and 

 they form, with the epiotics, the posterior concave border of the 

 occiput. 



The epiotics, somewhat rhomboidal, with the posterior external 

 angles produced backwards and outwards, forming the external 

 angles of the true cranium, and broader than long, are sutured in 

 front to the squamous, internally to the so-called supraoccipitals, 

 and externally for a third of their length to the quadrates, the 

 outer two-thirds being free. Behind and beneath they are united 

 by suture to the upper surface of the occipitals. A small portion 

 of the outer and posterior margins of each of these bones is 

 wanting, having been broken off. 



I have not ventured to mark out, even by dotted lines, what 

 I consider to have been the original outline of these parts. 



Under surface of the skull (Plate TIL). — This entire surface, 

 excepting the premaxillary part, has suffered great vertical de- 

 pression. The median suture, uniting the premaxillaries, is 

 distinct, and is seen to be continued further back between, first 

 the vomers and then the pterygoids. On the right side of the 

 median line the palate is nearly perfect; on the left, the maxil- 

 lary bone is wanting. Nearly the whole of the prseniaxilla, the 

 nasal channel, the entire palatal tooth, a portion of the palate - 

 bone, and the corresponding part of the maxilla of the right side 

 are unfortunately covered by the angular bone of the right 

 mandible, which has been thrown obliquely along that part of 

 the inferior surface of the cranium. 



The above parts are all exposed and well seen on the left side. 

 Besides this, the posterior piece of the left palate-bone, which 

 bears a series of small teeth, has been shifted from its natural 

 position, and lies on the posterior part of the upper surface of 



