﻿ILLUSTRATIONS 



Plates from photographs by Day and Martin ; text figures from drawiugs by Espinosa. The 

 species represented in all of the plates and the text figures is Ophiocephalua atriatut 

 Bloch. 



Plate I 

 The whole skeleton, articulated; from the left side. 



Plate la 

 Anterior part of skeleton, natural size. 



Plate lb 

 Middle part of skeleton, natural size. 



Plate Ic 

 Posterior part of skeleton, actual size. 



Plate II 



The top of the skull from the dorsal side. 



16, nasal. 67, vomer. 



26, supratemporal. 72, exoccipital. 



27, posttemporal. 73, otoliths. 



85, supraoccipitaL 75, supraethmoid. 



36, frontal. 76, prefrontal. 



37, parietal. 79, epiotic. 



38, pterotic. 81, ethmoid. 



39, sphenotic. 



Plate III 



A part of the disarticulated skull. 



16, nasal, from dorsal side. 



86, frontals, left from dorsal side and right from ventral. 



37, parietals, left from dorsal side and right from ventral. 



38, pterotics, left from dorsal side and right from ventral. 



39, sphenotics, left from dorsal side and right from ventral. 



66, parasphenoid, from the dorsal side. 



67, vomer, from the dorsal side. 



73, otoliths, left from the inside and right from the outside. 

 76, prefrontals, from the dorsal side. 



78, prootics, left from dorsal side and right from ventral. 

 81, ethmoid, from the dorsal side. 

 83, basisphenoid, from the dorsal side. 

 122, alisphenoid, right from the ventral side. 



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