628 mk. r. h. burne on the anatomy of the [may 25, 



Apodes. 



Anguillid.5;. 

 Anguilla vulgaris. 



The anterior nostril lies at the end of a short tube upon the 

 upper lip not far from the mid-line ; the posterior is a simple 

 circular perforation situated close in front of the eye. 



The olfactory chamber occupies the area between the nostrils, 

 broadening gradually behind and terminating in a roimded end to 

 the mesial side of the posterior nostril. Its floor and mesial side 

 are covered by an olfactory rosette in which the laminae lie at 

 right-angles to a linear raphe that runs from the anterioi' nostril 

 to the hinder end of the olfactory chamber. The individual 

 laminse are triangular in outline. 



Conger tndgaris. 



The Conger agrees in all essential particulars with the Eel as 

 regards the structure of its nose. 



The olfactory nerves are of enormous size, which accords with 

 Bateson's observation that the Conger is one of the few Fishes 

 that hunt by scent. He also states that the water current in 

 the nose is due to the movement of cilia in the tubular nostril. 



MURiENID^. 



Murcena tigrina. 



The olfactoiy organ is very similar to that of an Eel or even 

 more to that of a Siluroid (e. g. Fimelodus). Both nostrils are 

 situated at the extremity of a short tube, one projecting forwards 

 above the snout, the other backwards above the eye. 



The olfactory chamber is a simple oval cavity lying between the 

 two nostrils and occupied by an elongated oval rosette. 



Murmna zebra had an olfactory organ of precisely the same 

 character, except that the cavity and rosette were shorter and 

 rounder. 



Suminary. 



In this group the examples seen show a very strong similarity 

 in the structure of the nose and a close resemblance also (through 

 the Mursenidfe) with that of Siluroids, The anterior nostril (and 

 sometimes the posterior) is strongly tubular and the cavity and 

 rosette are elongated. 



H A p L o M I. 



EsOCIDoE. 



Esox lucius (text-fig. 198). 



The nostrils lie close together upon the slope of the forehead 

 about one quarter the distance from the eye to the snout facing 

 upwards and forwards. The anterior is circular, of relativelj- 

 large size (about a quarter the diameter of the eye) and flush 

 with the surface. The posterior is crescentic, with the concavity 



