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



the border of the maxilla and upon the adductor mandibulae to a 

 point below the eye. 



It rests- partly upon the palatine, but mainly upon the buccal 

 membrane. Both sacs are strongly compressed by the bones of 

 the upper jaw as the mouth is closed. The lachrymal sac pro- 

 bably is also directly aflected by the swelling of the adductor 

 mandibulfe, and the pressure of water against the buccal membrane 

 during the act of expiration. 



/Summary. 



Except in the presence of large ethmoidal and lachrymal sacs 

 there is no very gi-eat resemblance between the olfactory organs 

 of the above two representatives of the Scleroparei. The rosette 

 in particular is very different, that of Trigla being of the normal 

 oval type, and that of Cyclopterus rather of the type found in 

 Cotius and Bovichthys. 



JUGULARES. 

 TrACHINIDtE. 



Trachinus vipera. 



The nostrils lie close in front of the anterior border of the eye 

 surrounded at some little distance by the lachrymal and nasal 

 bones, and by the antorbital process of the ethmoid. Both are 

 small, the anterior slightly tubed with a small posterior hood-like 

 elevation, the posterior a vertical slit valved against ingress by 

 thin protuberant lij)S. The bridge of skin between the two 

 measures less than 2 mm. 



The olfactory chamber lies directly below the nostrils, in the 

 normal position as regards the deeper bones of the skull. It is 

 occupied by a rosette of the normal oval type consisting of from 

 fifteen to twenty sharply convex laminse. Above the posterior 

 end of the rosette is a clearly defined oval aperture leading into 

 an ethmoidal accessory sac of normal type, which is compressed by 

 the backward process of the premaxilla when the mouth is closed. 



NOTOTHENIID^. 



Bovichthys variegatus. 



The nostrils lie in the posterior third of the distance between 

 the upper part of the eye and the snout. The anterior is in the 

 form of a short tube, the posterior is a vertical slit valved against 

 the entry of water by the thinness of its backwardly directed 

 anterior Kp ; between the two is a bridge of skin about 1 mm. in 

 breadth. The rosette is circular and composed of nine swollen 

 laminte radiating from a central circular boss, which has no 

 connection with the anterior nostril, as in most Fishes. 



The olfactory chamber is expanded below and in front to form 

 an extensive though shallow accessory sac which lies under cover 

 of the lachrymal scute, and to a slight extent beneath the adductor 



