646 



MR, R. H. BURNE ON THE ANATOMY OF THE [May 25, 



swollen cushion-like base, from the surface of which protrude 

 the apices of about thirty sharp-pointed laminte attached to a 

 linear central raphe in the usual way. Owing to the abnormal 

 structure of the face the olfactory chamber does not occupy 

 the usual hollow in the ethmoid, but lies higher up in a cavity 

 between the backward process of the premaxilla and the upper 

 part of the ethmoid, separated by a prominent ridge from the 

 cavity of the ethmoid, within which it would normally be 

 lodged. 



Text-fig. 210. 



PN. 



Zeusfaher. 

 Left olfactoiy organ, from the side, showing abnormal position. 



The anterior parts of the cavity below the rosette are produced 

 forward above the same ridge of bone tow^ards the expanded head 

 of the maxilla, forming a large finger-shaped accessory sac, filled 

 with mucus and separated by a large lymph-space from the 

 deeper parts of the skull. 



This accessory sac, except for its position with regard to the 

 facial bones, is in many ways very similar to that of Merluccms, 

 and it should be noted that both were filled with mucus. 



Pleuronectid^. 

 Hippoglossiis vidgaris. 



The olfactory organs are situated on either side of the head, 

 that of the right in front of the interorbital ridge, that of the 

 left just to the left of the dorsal line of the body. 



