Plate 4. 



Fig. 14-17. Bassozetus nasus Garman. 



Fig. 14. The fish seen from tlie side. Drawing ; natural size. 



Fig. 15. A radiating disc iu transmitted liglit. Photograph; magnified 1 : 58. n, main disc 

 nerve ; p, reticulation formed by the pigment cells with their long processes. 



Fig. 16. A r.adiating disc in transmitted light. Photograph; magnified 1 : 27. n, main disc 

 nerve; p, reticulation formed by the pigment cells witli their long processes. 



Fig. 17. Transverse section of a radiating disc. Stained: liaematoxylin. Drawing; mag- 

 nified 1 : 42. b, blood vessels ; c, paratangentially arranged connective-tissue 

 cells ; n, main disc nerve ; p, basal pigment cells. 



