122 



Mr. T. Regan on the Anatomy 



the mesethmoid appears as a large plate overlying the vomer 

 and has a lateral process on each side supporting an upwardly 

 directed process of the anterior part of the palatine, in front 

 of which that bone is suturally united with the vomer ; tiie 

 well-developed mesopterygoid overlaps the parasphenoid ; 

 the series of circumorbitals is noteworthy for the firm attach- 

 ment of the supraorbital to the lateral ethmoid and frontal 



Fig. 1. 



I 



../} :spa 



Skiill of Aulopus filamentosm, from above and from the side. 



V, vomer ; eth, mesethmoid ; leth, lateral ethmoid (praefrontal) ; «, nasal ; 

 in, infranasal ; sor, supraorbital ; por, postorbital ; /, frontal ; 

 p, parietal ; soc, supraoccipital ; eoc, exoccipital ; boc, basioccipital ; 

 spo, sphenotic (postfrontal) ; ^rfo, pterotic ; epo, epiotic ; opo, opis- 

 tbotic ; pro, prootic ; i)sj), parasphenoid ; bsp, basisphenoid ; asp, 

 alisphenoid ; osp, orbitosphenoid ; t, temporal plate (lateral dermo- 

 occipital). 



and of the uppermost postorbital to the frontal and sphenotic ; 

 there is a well-developed infranasal ; the opercular bones are 

 remarkable for the great development of the suboperculum, 

 which forms the entire posterior margin of the gill-opening; 

 the branchiostegals also are long and curved upwards. 



