290 A. Smith Woodicard—On Eurycormus. 



description ; the side walls of the brain-case and the otic capsule, 

 though evidently ossified, are also obscure ; a small post-frontal 

 (Fig. 1, pt.f.) seems to be present; and the only other recognizable 

 cartilage-bone worthy of note is the robust, triangular prefrontal 

 (Fig. 1, pr. f.), which constitutes the antero-superior angle of the 

 orbit. The interorbital septum is apparently unossified. 



The membrane bones of the cranial roof are much crushed and 

 broken, but portions of the long, narrow parietals (Figs. 1, 2, pa.) 

 and frontals (Fig. 1, /.) are distinguishable, the former and the 

 posterior half of the latter displaying a superficial tubercular orna- 

 ment. The parietals extend to the occipital border, and the hinder 

 part of their median suture exhibits a very deep sinuosity (Fig. 2). 

 The precise limits of the parietals and frontals are not shown, owing 

 to the accidental crushing and removal of the middle region of the 

 skull. On either side of the parietals, a large squamosal occurs 

 (Figs. 1, 2, sq.), longer than broad, and with a slightly excavated 

 outer border into which fits the upper margin of the superior post- 

 orbital : it is superficially marked by a few scattered tubercles and 

 pittings, and a transverse, though inwardly and backwardly inclined 

 groove in the posterior half seems to indicate a sensory canal. On 

 the right side, partly overlapping the anterior extremity of the 

 frontal, is a well-preserved nasal (Fig. 1, na., Fig. 3), longer than 

 broad, with a rounded and somewhat fluted posterior margin, and 

 superficially marked with a few rugosities and tuberculations : at 

 the anterior outer angle of this bone a small narrow smooth process 

 occurs, distinctly notched at its base, especially on the inner side, and 

 thus marking the position of the openings of the olfactory capsule. 



The hyomandibular (Fig. 4) is exposed on the left side, much 

 vertically elongated, and with a broad mesial expansion posteriorly ; 

 the upper extremity is scarcely expanded, the anterior margin is 

 slightly concave, and a prominent longitudinal ridge occurs upon 

 the anterior half of the outer face of the bone, gradually becoming 

 obliterated above and below. Of the symplectic and quadrate nothing 

 is recognizable, and the only element of the pterygo-palatine arcade 

 identifiable with certainty appears to be a portion of the great, broad 

 metapterygoid on the left side. 



The extremity of the snout is broken away, thus exposing small 

 plate-like bones in the anterior part of the roof of the mouth, covered 

 with a cluster of slender, conical teeth (Fig. 8) : these are evidently 

 the vomers, and may perhaps also comprise portions of the palatines. 

 The premaxillas are lost, except a small fragment on the left side, which 

 bears a conical tooth of larger size than those of the inner cluster just 

 mentioned. The maxilla (Fig. 1, rnx.) is long and slender, laterally 

 compressed, gently arched so that the alveolar margin is convex, and 

 more than twice as deep behind as in front ; a robust inwardly- 

 directed process extends from the anterior end of the bone to abut 

 against a portion either of the palatine or vomer ; its outer face is 

 rugose, but not tuberculated ; and the teeth are arranged in a single 

 close series. In the hinder two-thirds of its length the maxilla is 

 bounded above by a long narrow jugal bone (Fig. l,ju.), abruptly 



