150 



Zf)OL()r4Y 



the pharyiigobianchials of the last two arclios are fused together- 

 The next in order — the cjnliranchials {cp. hr.) — with the exception 

 of those of the last arch, bear a number of slender cartilaginous 

 rods — the hranrliial rai/s — which support the walls of the gill-sacs; 

 and the next — the ccratohranchiah {ccr. hr.) — are, with the same 

 exception, similarly provided. The liypohrnnclviuh (hyp. hr.), which 

 succeed these, are absent in the case of the first and fifth ai'ches. 

 In the middle line on the lloor of the pharyngeal cavity is a mesial 

 cartilage — the hasibrandiinl (Fig. 814, i. hr.) — which is connected 



hi/p.br 



S14.— Hemiscyllium, vcntriLl viuw nf the visceral arc'lics. Letters ^s in iircccJiiit,^ fii^^uvc. 

 I?i addition—/., hr. liasiltrancliial plate ; c^i\ hr. eeratnbraneliials ; //j//.. /.;'. hypobranchials. 



with the ventral ends of the third, fourth, and fifth arches. A 

 series of slender curved rods — the cxtri(hranchials — lie superficial 

 to the branchial arches, along the borders of the corresponding 

 external branchial clefts. 



Two pairs of delicate lahial cartilages are j^resent at the sides 

 of the mouth, and a couple at the margins of the openings of the 

 olfactory capsules. 



The skeleton of all the fins — paired and unpaired — presents a 



