— 121 — 



united. It forms part of the roof of the temporal fossa, and is traversed by the main infraorbital 

 and supratemporal latero-sensory canals, lodging one organ of each of those lines. 



The SUPRASCAPULAR is bounded anteriorly by, and firmly united with, the lateral extra- 

 scapular and the parieto-extrascapular, and forms part of the hind edge of the casque-like dorsal 

 surface of the skull. It has opisthotic and epiotic processes which are attached, respectively, and 

 in the usual manner, to processes of the opisthotic and epiotic bones. Immediately posterior to the 

 base of the opisthotic process there is a large articular facet, the lateral edge of which is slightly 

 differentiated as an articular eminence, this being more evident in small than in large specimens. 

 The two surfaces give articulation to articular surfaces on the dorsal end of the supraclavicular. 

 Immediately posterior to the articular eminence is the posterior opening of the section of latero- 

 sensory canal enclosed in the bone, this section of canal lodging one sense organ of the main infra- 

 orbital line. The bone extends some distance beyond the opening of the canal and terminates in 

 a stout point. 



The SUPRACLAVICULAR has a small dorsal end, the anterior corner of which is entirely 

 occupied by a large condylar eminence. Immediately postero-lateral to this eminence, there is a 

 small flat or slightly concave articular surface. These two surfaces articulate with the two articular 

 surfaces on the ventral surface of the suprascapular, the supraclavicular lying beneath the supra- 

 scapular and not extending back to the hind end of that bone. Immediately posterior to these artic- 

 ular surfaces the posterior half of the dorsal edge of the bone is traversed by the main latero-sensory 

 canal, the section of canal lodging one sense organ of the line. The ventral end of the bone is slightly 

 expanded, and has a large depression on its inner surface. The anterior and posterior edges of this 

 depression, and also the thin ventral edge of the bone, rest upon and are firmly bound by tissues 

 to the dorsal end of the clavicle, the supraclavicular fitting into a depression on the outer surface 

 of the latter bone. This depression in the clavicle surrounds a deep notch in the edge of that bone, 

 this notch corresponding to the notch shown in my figures of the clavicle of Scomber. The depressed 

 region on the inner surface of the supraclavicular overlies this notch in the clavicle, and the occipito- 

 supraclavicular ligament, passing through the notch, has its Insertion in the depression on the supra- 

 clavicular. Nothing whatever in the arrangement of the parts is abnormal, as compared with Scor- 

 paena, nor is the supraclavicular (postero-temporal) at all crowded out of its normal place and 

 relation to the other bones, as stated by Gill ('88) and by Jordan and Evermann ('98). The bone 

 is simply inclined backward more than in Scorpaena, its dorsal end is smaller, and the prolonged 

 hind end of the suprascapular projects backward considerably beyond it. 



The PARASPHENOID is large, with expanded anterior and posterior portions that are con- 

 nected by a short but relatively wide intervening portion. The ventral surface of the anterior portion 

 is deeply grooved to receive the vomer, the dorsal surface of this portion presenting a correspondingly 

 wide, low and rounded, median longitudinal ridge. On the dorsal surface of the posterior portion 

 of the bone there is a wide raised median portion, the deeply grooved lateral edge of which receives, 

 on either side, the cartilaginous ventral edge of the proötic; the raised portion thus not only closing 

 the hypophysial fenestra but also forming, on either side of that fenestra, a relatively considerable 

 part of the floor of the myodome. The ascending process of the bone, on either side, is represented 

 by a short, slender and sharply pointed dorsal extension of the thickened anterior edge of the ex- 

 panded posterior portion of the bone, and so unimportant is it that the process seems, at first sight, 



Zoologica. Hrft 57. 16 



