176 TELEOSTOMES 
of the shark. As a somewhat transition form to the more 
usual conditions of the Teleost, the Raddit-fish has been 
figured (Fig. 184 A). (Plectognathi.) 
Fig. 184.— The porcupine-fish, Chilomycterus geometricus (Schn.), Kaup. x #. 
(After GOODE in U.S. F. C. report.) Warmer Atlantic, 
Fig. 184 A.— The rabbit-fish, Lagocephalus levigatus (L.), Gill. x %. (After 
GOODE in U.S. F.C.) Northeast Atlantic. 
A final, perhaps the most bizarre, instance of adapta- 
tion among Teleosts is that of the Sea-horse (Fig. 185). 
In spite of its many structural oddities, its genetic kin- — 
ship with the Sticklebacks (Hemibranchiates) cannot be 
doubted. Yet to have attained its present form its evolu- 
tion must have been carried along a widely divergent path. 
It may, in the first place, have fused the lines of its meta- 
meral scales, dividing off the surface of its elongate body 
