634 



MR 



. E. H. BURNE ON THE ANATOMY OF THE [May 25, 



its front half only being occupied by the rosette. The laminae of 

 the rosette are very feeble and resemble those of the Pike. 



Gastrosteid^. 



The olfactory organ of Gastrosteus has been described by Solger. 

 He states that it has in connection with the lower part of the 

 olfactory chamber an accessory nasal sac. One nostril only 

 is present. It has the form of a short tube, situated in the 

 normal position between the nasal and lachrymal scutes. 



Percesoces. 

 ScoMBREsociD^ (see Blaue). 

 Belone vulgaris (text-fig. 203, A). 



The olfactory organ of this species has been described by Blaue. 

 The chief peculiarity in it is that the olfactory chamber is a 

 simple open pit, from the centre of which protrudes a solid 

 mushroom-shaped boss, representing the usual laminate rosette. 



Text-fio-. 203. 



L.c. 



A. The right olfactory organ of Belone vulgaris, from above. 



B. The right olfactorj^ organ of HemirhampJius, from the side. 



L.C, lateral-line canals in the lachrymal. 



Hemirhamphus (text-fig. 203, B). 



The olfactory organ is veiy similar to that of Belone, but the 

 central boss is relatively smaller. 



