Plate 3. 



Figs. 10-13. Leucicoius hisciosiis Garman. 



Fig. 10. Tlie fish seen from the side. Drawing ; iKitiiral size. 



Fig. 11. A i;uliatiiig disc in transmitted liglit. Photograph; magnified 1:41. b, bhjod 

 vessel; n, main disc nerve; n', smaller accessory disc nerves. 



Fig. 12. A radiating disc in transmitted light. Photograph, magnified 1 : 21. b, blood 

 vessels; n, main disc nerve; n', smaller accessory disc nerves. 



Fig. 13. Transverse section of a radiating disc. Stained: haeraatoxylin. Drawing; mag- 

 nified 1:42. b, bloodvessels; c, paratangentially arranged coilnective-tissue 

 cells ; cv, cavities in the basal part of the radiating disc ; n', small accessory 

 disc nerve ; p, pigment cells. 



