HOLOCEPHALI 



177 



Fig. 141. 



A, dentition of Myriacanthus. B, dorsal view of Squalorqja polyspondyla, Ag. C, 

 dentition of Callorhyn-ehus; D, of Squalorqja ; E, of Rhynohodus ; F, of Harriotta elegans. D 

 and G, Elasmodus Hunteri, Eg. (All after Dean.) a.cl, anterior clasper ; c, paired cartilage ; 

 61, clasper; f.v, fused postoccipital vertebrae ; pst, 'predentary' tooth ; pt, ' palatine' tooth- 

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

 tt, tentaculum ; v.c, vertebral column ; v.t, 'vomerine' tooth. 



