NO.1301. OSTEOLOGY OF HEMIBRANCHIATE FISHES— STARKS. 631 



The supraclavicle is a short, scale-like bone, setting low on the clavi- 

 cle, simply serving as a septum between the clavicle and post-temporal, 

 and not suspending the former lower than it might l)e were it articu- 

 lated directly to the post-temporal. 



The clavicle is a complex bone, bending backward at its upper end 

 to support the long simple postclavicle, which appears exteriorly as the 

 up})er lateral plate behind the head. It (the clavicle) borders nearly 

 half of the fenestre, which t3-i)ically is through the center of the 

 hypercoracoid. It sends a wide process from its middle directly below 

 this fenestre backward and downward to the hypocoracoid. Its lower 

 end is straight, running obliquely forward to where it joins the lower 

 end of the Iwpocoracoid (''interclavicle"), leaving an open space 

 1)ehind and between the forks of the hypocoracoid. 



The hypercoracoid is little more than a rod of bone forming some- 

 what more than half of the fenestre, between it and the clavicle. It 

 strongly resembles in shape and position the long, slender actinosts. 

 The first pectoral ray works directly on it, as usual, and from this fact 

 and its appearance one not knowing the cartilaginous origin of the 

 l>one might conceive the possibility of the Iwpercoracoid having orig- 

 inated from an actinost. This fancy is perhaps disturbed by the fact 

 that the upper actinost is attached to its upper outer edge. 



The other three actinosts are attached to the hypocoracoid or end 

 ill cartilage over it. 



The Shoulder Girdle of Macrorhamphosus sagifl-e, (new species.) 

 macrorhamphosid.e. 



The cranium is wedge-shaped as viewed from above. Posteriorly 

 it is abruptly vertically truncated. The epiotics reach to the posterior 

 edge of the cranium, and, bending sharply over, show about half of 

 their surface above and half posteriorly. 



The post-temporal is small and conical and ankylosed to the cranium, 

 forming the outer lower angle. On'the lower surface of the cranium 

 it articulates with the exoccipital at its inner edge, and with the 

 pterotic anteriorl}^; on the posterior surface, with the exoccipital and 

 the epiotic; on the superior surface with the pterotic anteriorly, and 

 with the epiotic at its outer edge. 



The supraclavicle is so closely attached against the outer upper part 

 of the clavicle that it is difficult to make out. It scarcely rises above 

 the head of the clavicle. 



The line of bony plates along the upper part of the sides is continu- 

 ous over -the clavicle, with a ridge on the post-temporal and the 

 pterotic. These are doubtless homologous with the lateral line plates 

 of Aulorhynchu.s. 



A broad, thin plate projects backward from the middle of the inner 

 edge of the clavicle and supports the hypercoracoid and the upper 



