C YPRINIFORMES 



383 



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

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



Section of Muluiiterurus clectricus, Gm., showing the electric organ, A. B, vascular layer : 

 K, adipose tissue ; G, muscles. (From Owen, Anatomy of Vertebrates, by permission.) 



-de. 



FIG. 373. 



Plecostomus Commersonii, Yal. A, piece of lepidotricli, enlarged. B, several scales, from 

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

 enlai-ged. D, section through a developing denticle of Hypostoma (D, after Hertwig). u.s, 

 smooth anterior region ; d, denticle ; d.c, dentine cap ; en, enamel cap ; c;i, epidermis ; l.c, 

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



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

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



