Plate 5. 



Figs. 18-20. Maerurus c.auus Garniau. 



Fig. 18. Tlie fisli seen from tlie side. Drawing ; natural size. 



Fig. 19. A radiating disc in transmitted light. Photograph; magnified 1:41. n, main 



disc nerve ; p, branched pigment cells. 

 Fig. 20. A radiating disc in transmitted light. Photograph ; magnified 1:17. n, main disc 



nerve; p, branched pigment cells. 



Figs. 21-23. Myctopluim aurolaternatum Garman. 



Fig. 21. The fish seen from the side. Drawing; natural size, al, anterior lateral r.adiating 

 organs; ma, mandibular r.adiating organs; ml, mediolateral radiating organs ; 

 op, opercular radiating organs; pe, pectoral radiating organs; pi, posterior 

 lateral radiating organs; va, anterior ventroanal radiating organs; ve, veutro- 

 caudal radiating organs; ve, ventromedial radiating organs; vp, posterior ven- 

 troanal radiating organs. 



Fig. 22. The fish seen from below. Drawing; natural size, al, anterior lateral radiating 

 organs; ma, mandibular radiating organs; ml, mediolateral radiating organs; 

 op, opercular r.adiating organs; pe, pectoral rixdiating organs; pi, posterior 

 lateral radiating organs ; va, anterior ventroanal radiating organs; vc, ventro- 

 candal radiating organs ; ve, ventromedial radiating organs ; vp, posterior 

 ventroanal radiating organs. 



Fig. 23. Axial section vertical to the median plane of the fish througli a posterior lateral 

 r;xdiating organ. Stained: hacmatoxylin-picric .aciil-fuchsin. Drawing; magni- 

 fied 1 : 140. b, blood vessels ; c, connective tissue of the interior of tlic organ ; 

 p, section through the outer horseshoe-shaped pigment cell band ; pc, radiating 

 cells; pp, internal pigment cell layer; si, scale iin<lerlying the radiating oi-gan ; 

 ss, scale covering the radiating organ ; t, section through the 11-shaped thickeu- 

 injr of the covering scale. 



