— 107 — 



The EPIOTIC has on its posterior surface, an epiotic ridge, which projects postero-laterally 

 to an unusual extent and nearly meets the opisthotic process of the suprascapular; thus nearly or 

 even quite closing the posterior opening of the temporal fossa. 



The SUPRAOCCIPITAL has dorsal and ventral limbs, the forrner of which is largely 

 exposed, on the dorsal surface of the skull, between the frontals and parieto-extrascapulars. The 

 hind edge of the dorsal limb projects backward, forming a short horizontal plate-like process 

 which slightly overhangs the ventral limb and rests upon, and is fused with, the dorsal 

 edge of the spina occipitalis. 



2 INFRAORBITAL BONES. 



The infraorbital bones are, as in Scorpaena, four in number; a lachrymal, two suborbitals, 

 and a postorbital. 



The lachrymal is concave on its outer and convex on its inner surface. It has a short anterior 

 edge, the ventral half of which lies upon the lateral edge of the broad anterior end of the maxillarv 

 process of the palatine, and is very firmly bound to it by tissue. The dorso-anterior corner of the 

 bone bears, on its dorsal edge, a large concave articular facet which articulates with the articular 

 head on the ventral edge of the lateral process of the ectethmoid. The mesial edge of this facet is 

 greatly thickened and forms a stout process projecting mesially, the outer end of which is deeply 

 grooved. The ventro-anterior surface of this process is rounded, and fits against and is firmly bound 

 to the bottom of a unshaped depression on the external surface of the palatine; some slight motion 

 being possible between the two pieces. The groove on the outer edge of the process is presented 

 posteriorly, is free, and simply gives attachment to tissues of the region. The bone lodges two sense 

 Organs of the main infraorbital line, instead of three as in Scorpaena, the third and fourth organs 

 of the line here both lying in the first suborbital. 



The first suborbital is a short and irregulär bone, and lodges two sense organs, instead of a 

 Single one, as in Scorpaena. 



The second suborbital is long and extends backward to the anterior edge of the preopercular, 

 either touching, or almost touching that bone, and being bound to it by tissue. A broad, low and 

 rounded ridge extends the füll length of its outer surface. The main infraorbital canal traverses the 

 anterior two-fifths of the bone in a nearly horizontal position and then turns abruptly upward to 

 enter the postorbital bone, giving off at the bend a short tube directed ventro-posteriorly, this tube 

 being double in the specimen used for Illustration. The bone lodges two sense organs, one lying 

 anterior and the other posterior (here dorsal) to this tube. The posterior three-fifths of the bone, 

 and the ridge on its outer surface, are thus not developed in any apparent relation to any of the tubes 

 of the latero-sensory canal. 



The postorbital bone is bound to the dorsal edge of the second ^uborbital at about the anterior 

 two-fifths of its length, and it and the postfrontal form a slightly curved line which is convex anteriorly 

 and directed upward and backward to join the dorso-lateral edge of the skull at the sutural line between 

 the frontal and pterotic. The two bones lie slightly posterior to the orbit, the hind edge of the orbit 

 being formed by a stiff membrane that is attached to the anterior edges of the two bones. The post- 

 orbital lodges a single latero-sensory organ. 



