80 ]Mr. C. T. li.'gaii on the 



§§§§ Body naked or scaly; skeleton veil ossified : no 

 honiocercal caudal tin ; opisthotic extending 

 downwards to the ba.sioccipital. 



22. Anacanthini. 



c. Phvsoclistic ; pelvic bones embraced by or articulated to the 



coracoids ; pelvic tins without spines, often with numerous 

 rays; maxillary free, protractile. 23. Allotrioi/nathi. 

 u. Budy deep ; skeleton well ossified ; an occipital crest ; 

 lower pharyno-eals toothed ; post-temporal forked ; au 

 orbitosphenoid. 

 Frontals noraial, in contact below with the 

 niesethmoid and orbitosphenoid ; ribs 

 sessile ; pelvic bones articulated to the 

 greatly expanded coracoids ; each pelvic 



tin of lo to 17 rays 2.3 «. Lamproidei. 



Frontals forming the lateral walls of a 

 chamber, the floor of which is formed 

 bv cartilage containing the mesethmpid 

 and orbitosphenoid ossiticatious ; ribs on 

 parapophyses ; pelvic bones not articu- 

 lated to the coracoids; each pelvic fin 

 of 8 or 9 rays 2?,b. Veliferoidei. 



/3. Bodv elongate ; skeleton feebly ossified ; no occipital 

 crest ; lower pharyngeals toothless ; post - temporal 

 simple. 

 An orbitosphenoid ; epiotics meeting behind 

 the supraoccipital : palatine and ptery- 

 goids present ; neural and hsemal spines 



present ; body ribbon-shaped 23 c. Traciiypteroidei. 



No orbitosphenoid; epiotics separated by the 

 supraoccipital; no palatine; pterygoids 

 represented by a single small element ; 

 no neural and haemal spines ; body eel- 

 shaped 23 r/. Stylophoroidei. 



d. Physoclistic ; cranium symmetrical ; an orbitosphenoid or 



pelvic bones directly attached to the cleithra ; pelvic tins 

 usually with more than 6 rays, the first of which may be 

 spinous ; maxillary attached proximally to a process of the 

 palatine 24. Betycomorphi. 



An orbitosphenoid 24 fl. Berycoidei. 



No orbitosphenoid 24 6. Zeoidei. 



e. Physoclistic ; cranium asymmetrical ; pelvic bones directly 



attached to the cleithra ; tins without spines. 



25. Heterosomata. 



f. Physoclistic ; cranium svnimetrical ; pelvic bones directly 



attached to the cleithra t : each pelvic fin of a spine and 

 5 soft rays or still further reduced ; no orbitosphenoid. 



u. Post-temj: oral more or less distinctly forked, attached to 

 the epiotic above and to the opisthotic or exoccipital 

 below. 

 * Spinous dorsal not forming an adhesive disc. 



26. Percomorphi. 



t Except in the Trichiuridae and Tetragonuridfe, in which the indirect 

 attachment is assumed to be due to degeneration. 



