C YPRINIFORMES 



383 



H. B. ; Chaca, C. and V. Asia. Doras, Qthr. ; Oxydoras, Kner ; 

 Callomystax, Gthr. Glanidium, Liitk. ; Cetopsis, Ag. America. 



FIG. 37-2. 



Section of Malapterurus elcctricus, Gin., showing the electric organ, A. L', vascular layer 

 K, adipose tissue ; G, muscles. (From Owen, Ana.tomy ofVertcbrc.tes, by permission.) 



-de. 



l> 



FIG. 373. 



Plecostomus Commersonii, Val. A, piece of lepidotrich, enlarged. B, several scales, from 

 which the skin lias been removed on the left. C, small piece of the surface of a scale, much 

 enlarged. D, section through a developing denticle of Hypostoma (I), after Hertwig). a.s, 

 smooth anterior region ; d, denticle ; <l.c, dentine cap ; en, enamel cap ; r/>, epidermis ; l.c, 

 lateral-line canal ; w, enamel organ ; p, pulp ; .so, scale ; ./, segment of lepidotrich. 



Sub-Family MALAPTERURINAE. Malaptcrarus, Lac. ; Africa ; with 

 a large electric organ (Figs. 371, 372) (Fritsch [141]). 



