258 



'ENDEAVOUR SCIENTIFIC RESULTS. 



in this respect resemble the Soleidse and Cynoglossidae. 

 The symmetrical position of the nasal organs in these 

 flatfishes appears to be correlated with the size of the 

 eyes, since the migration of a small eye would occasion 

 much less disturbance of the anterior region of the 

 head than would that of a larger eye. 



7 



F G 



Fig. 8. Arrangement of olfactory laminae in nasal organ of: 



(A) Pelotretis flavilatus. (B) Azygopus pinnifasciatus. 



(C) Colistium nudipinnis. (D) Ammotretis tudori. 



(E) Ammotretis rostratus. (F) Rhombosolea plebeia. 



(G) PeltorhampJius novce-zeelandia;. 



In the dextral Pleuronectinae and in the Samarinae 

 the olfactory laminae rim parallel to one another, and 

 there is no median rachis. This arrangement is quite 

 different from that exhibited by the Paralichthodidae, 

 the Bothidae and the Soleoidea, in which the olfactory 

 laminae are arranged transversely to or radiating from 

 a median rachis. Among the Khombosoleiuae, Ammo- 



