50 



THE SKATE 



Boatifat eafttta^ 



^SilifHtal tartilage 



PttrygO'4iuadrate_ 

 cartilage or 

 upp rjato 



Spiraeular 

 cartilage 



Byomandibular 



Propterygium 



Metopttrygxwn 



bial cariilagt 



Labial cartilage 



.Labial cartilage 



Meckel's cartilage 

 — or lower jato 

 —Hypo-hyal 

 ■Ceratohyal 

 ~Epi-kyal 



•Hypo-branchial of the 

 third branchial arch 

 ^Third cerato-branchialt 

 —Third epi-branchial 

 .Hypo-branchial of the 



fifth branchial arch 

 -Fifth oerato-branchiale 

 .interior glenoid facet 

 ■Soapulo-coracoid 

 fontanelle 

 'iddle glenoid facet 



Coraeoid fontanelle 

 <FoeUrior glenoid facet 



AnUrior^ ^ - 

 acetabular facet 



Hiac proeaee 

 'oeterior acetabular faeet 



Commencement of hasmat eanal 



FIG 2. The ventral aspect of the skeleton of Raja namta. (Eedia™ 

 from Parker, Zootomy, MacmiUan and Co.) 



gium, the strong basal piece of the hind limb. From the 

 metapterygium and the anterior facet the jointed radials 



