HOLOCEPHALI 



177 



.fit 



St. 



Fio. 141. 



A, dentition of Mi/riacanthus. B, dorsal view of Squaloraja polyspondyla, Ag. C, 

 dentition of Callorhytichus; _D, of Sijiutloraja ; E, of Rhyiichodiis ; F, of Harriotta elegans. D 

 and 

 rf. 



l>late 

 //, tentaculuni ; v.c, vertebral column-; v.t, 'vomerine' tooth. 



lentition 01 catloriiyticnus; u, 01 omtaiorcya, fi, 01 xnyncnoaits; e, or /larnotrrt fiegans. u 

 nd G, Elasmodus Hunteri, Eg. (All after Dean.) o.ci, anterior clasper ; c, paired cartilage ; 

 *, clasper; /.v, fused postoccipital vertebrae ; pst, 'predentary' tooth ; pt, ' palatine' tooth- 

 >late ; pv.t, ' prevoinerine ' tooth ; r, rostrum ; st, tooth-plate of lower jaw ; t.n, tritoral area ; 



12 



