DEFORMITIES IN SALMONIDAE. 261 



of the articulation that exists in Salmo between the 

 supra-maxillaries and the palatines, the slight develop- 

 ment of vomer, parasphenoid and palatines has hindered 

 the supra-maxillaries in their growth and prevented them 

 getting their normal length. The left supra-maxillary is the 

 smaller and bears a few but very small teeth, the right 

 one is somewhat larger and bears teeth, which are much 

 more developed. 



Ethmoideum and nasalia have not ceased growing at so 

 early a period, and on account of the slight development 

 of the base of the skull in this region, the prenasal por- 

 tion of the head got crooked. 



Therefore the upper surface of the snout got bent, first 

 in a downward and then in a backward direction. The 

 praemaxillaria , fully developed but directed backwards , are 

 consequently lying under the palate. 



The teeth of the praemaxillaria are fullgrown, but have 

 their points directed upwards and forwards, due to the 

 abnormal position of these bones. 



This salmon was a ripe male , weighing 2,7 kg. and 

 showing no extraordinary meagerness. Stomach and inte- 

 stines were quite empty, as generally is the case with sal- 

 mons caught in our rivers. 



Leyden Museum, May 1885. 



Notes from the Leyden JMuseura, Vol. VII- 



