Aethur. — Notes on some Sjiechnens of migratory Salmonidse. ISS 



long. Ova, about the size of small pin-beads or turnip seed. Flesb, of a 

 pale pink colour. When cooked, this fish ate much finer than any brown 

 trout which I have tasted in Otago. 



Dimensions : Weight, 2 lbs. 14 oz. ; length, 17^ in. ; depth, 4^^ in. ; 

 girth, llj in. ; head, S^in. long. 



Teeth : Very fine on maxillary, palatines, and vomer. On head of vomer 

 two, and one rudimentary. None at all along body of this bone. On 

 mandible and tongue not so fine, coarser. 



Fin rays: D.ll, P. 13, V.9, A. 10, C.19 ; 5 sub-rays above and 5 under 

 origin of tail, as usual. Length of rays, D.2, P.2j^, V.lj^, A.2j-%in. 



Scales : 15 in transverse row, from adipose back to lateral line. 



Branchiostegal rays : 10. Pyloric cceca, 40 ; surrounded by much fat. 



5. S. cambricm. — A Welsh sea-trout, from the river Usk. This is one 

 of three specimens (smolt stage) preserved in spirits, in the Otago 

 Museum. 



General description : This specimen is discoloured, owing to the action of 

 the spirits in which it is preserved, in common with but not so bad as the 

 other two. In form : Rounded outhne, but not very full or deep in the 

 body ; thickness maintained towards the tail. Head contained 4,\ times in 

 extreme length of fish ; snout rounded ; jaws of equal length ; maxillary, 

 broad and fine ; posterior end accurately circular, and does not project 

 beyond vertical from posterior margin of orbit. Operculum large, hind 

 margin straight, and forms right angle with lower margin. Suboperculum 

 narrow, longer than broad, of rectangular form, but with the posterior angle 

 very circular, and projects behind the operculum. Preoperculum with a 

 rounded outline ; lower limb not distinct. Eye large and round. Fins 

 average size. Tail forked. Colour : Brown back, silvery sides ; scales 

 deciduous ; white belly ; par marks, ten, faintly visible. Spots black, 

 round, and numerous on gill-covers and body above and below lateral line 

 (which is distinct but not prominent). Dorsal fin spotted ; three spots on 

 adipose ; tail immaculate. So far as can be made out, dorsal fins and tail 

 dark ; pectoral, neutral, and anal fins white. 



Dimensions: 7-|-in. snout to tip of tail; head, l-^^in. ; other dimensions 

 proportional. 



Teeth : Fine, present on mandible, maxillary, and palatines ; vomer, 

 crescent-shaped ; head armed with a few teeth, shaft of bone with two dis- 

 tinct rows along outer edges. 



Fin rays: D.ll, P. 13, V.8, A. 9, C.19, with the usual four or five sub- 

 rays above and below. 



Scales: 15 in transverse row from adipose back to lateral line. 



Branchiostegal rays: 11. The pyl. cseca and vertebrse not examined. 



