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EDWIN CHAPIN STARKS. 



posed between the vomer and the nasal bones. Posteriorly it is 

 continued backwards as a cartilaginous plate separating the pre- 

 frontals and behind them is connected with the tissue of the inter- 

 orbital septum. The prefrontal is not pierced by the olfactory 

 nerve, but the nerve runs to the nasal chamber through a passage 



Fig. i. Siganus fuscescens. A, lateral view of cranium; B, lateral bones o 

 head, ah, alisphenoid ; ang, angular ; art, articular ; hoc, basioccipital ; den t 

 dentary ; epo, epiotic ; eth, ethmoid ; exo, exoccipital ; fr, frontal ; hy, hyomandibu- 

 lar; top, interopercle ; n, nasal ;. mpt,- metapterygoid ; mspt, mesopterygoid ; op, 

 opercle ; p, palatine ; pe, prepalatine ; pf, prefrontal ; pop, preopercle ; pro, prootic - t 

 prs, parasphenoid ; pt, pterotic ; pter, pterygoid ; q, quadrate. ; soc, supraoccipital ; 

 sop, subopercle ; spk, sphenotic ; sy, symplectic ; v, vomer. 



