XI 



ELECTKICAL FISHES 



385 



the other by the obvious cross-striation of the fully-developed 

 plates. 



The important question of homologies between the lamellae of 



a b c 



FIG. 252. Raja batis. a, Portion of a longitudinal section through an embryo. ' Club-shaped muscle- 

 fibres developing into electrical plates. &-/, Further stages of development. (Ewart.) 



the matured laminated layer, and the transverse striae of muscular 

 fibres, was till recently quite undecided. The careful investiga- 

 tions of Engelmann have thrown some light on the subject. 



VOL. II 2 C 



