Classijication of the Order Apodes. 



383 



spines sliovt, laminar ; neural arches without zygapnph^-ses ; 

 caudal vertebrre without lateral transverse processes ; ribs 

 and internniscular bones feeble. 



Heterenchelys, with two species from West Africa (' Annals/ 

 Sept. 1912, p. 323). 



Fi- 1, 



vl: 7?7/? V9P op sop 



epo- 



eoc 



pro osp 



Heterenchelys macrurus. Jaws, hyo-palatinej and opercular bones, and 

 skull from above and from the side. 



mx, maxillary ; den, dentary ; ar, articulare ; j?^, palato-pterygoid ; 

 hm, hyomandibular ; q, quadrate ; pop, praeoperculum ; op, opercu- 

 lum ; sop, suboperculum ; iop, iuteroperculum ; br, branchiostegals ; 

 eth, ethmoid ; r, vomer ; /, frontal ; p, parietal ; jisj), parasphenoid ; 

 asp, alisphenoid ; osp, orbitospheuoid ; pro, prootic ; sjm, sphenotic : 

 pto, pterotic; epo, epiotic; sac, supraoccipital ; ew, exoccipital ; 

 hoc, basioccipital. 



