1909.] 



OLFACTORY ORGAN OF TELEOSTEAN FISHES. 



619 



bridge of skin between the two is I'aised to form an upstanding 

 flap and is also prolonged into the nose cavity nearly to its floor 



Text-fie-. 192. 



s.o. 



Salmo solar. 



A. Position and form of nostrils, olfactory cavity, and nasal sac. 



B. Diagram of nostrils, olfactory chamber, and nasal sac in longitudinal section. 



(text-fig. 192, B), forming a pliant curtain to conduct water entering 

 by the anterior nostril through the laminae of the rosette. 



The olfactory chamber occupies the usual position in a hollow 



