10 



JOHAN KL-ER. 



[sec. ARCT. EXP. FRAM 



The proportion mentioned above would in that case decrease to 

 aliont 1.2. 



The greatest breadth appears to be almost exactly at the middle, 

 by the snpiaorbital commissure. The outline is oval, but in the front 

 (at the snout) it is narrower. The foremost portion of the crania! shield, 

 between the orbits and forwards, is flat; farther back the head is 

 rather markedly arclied, and as is usual in this genus, there is a 

 shghtly rounded protuberance behind the eyes. The sides of the head 

 behind the eyes are somewhat steep. 



Fiji 1. Tlircr- cross-seclicMis of Macropetalichthijs Sclieii new species. L'ppermost, 



near the sapra-orl>ital commissure. Tlie centre fignre at the point where the post- 



orhital canal branches off in the medial bone. Belo\\, at the posterior end of the 



poslorbital canal. Matura) size. 



Sculpture. This is only visible on a small part within the right 

 orbit. At this spot the siu'face shows fine, slight crenulated tubercles, 

 which behind appear to ha\e a tendency to run together into longi- 

 tudinal ridges. 



.Structure of the c r a n i a 1 bone s. Plate I, fig. 5, shows a 

 microscopic section through the right side of the cranial shield, behind 

 the supraorbital and infraorbital canals. The portion of the section 

 which appears greatly enlarged in fig. (j, is from the thickest part, inside 

 the [tostorbital canal. 



The structme clearly show s agreement with that of Coccosteus ded- 

 piens. The vascular canal system, however, is widei- and has thinner 

 walls than is the case with the latter; a comparatively compact base- 

 ment layer also appeals to be lacking. The bone-cells are small, often 

 round, as in the case of Coccosteus. 



Characters of cranial shield. The separate bones of 

 the cranial shield cannot be distinguished. They must be assumed to 



