356 ADDENDA. 



it differs iu a very extraordinary manner from the other fish of this 

 family in which sexual differences are observed. From an inspec- 

 tion of the figure, we should have considered the specimen to be a 

 male ; but Prof. De FLlippi says distinctly that the peculiar anal fin 

 is found in the female as well as in the male. 



1. Lebistes pceciloides. 

 De Filippi, I. c. taf. 4. fig. 6. 



D. 9. A. 7. Y. 6. L. lat. 34. L. transv. 8. 

 The specimens are Ig inch long. 

 Barbadoes. 



ADDENDA. 



Page 14. Salmo salar. 

 a\ Fine male specimen, 3 feet long. Beauly. Presented by Lord 



Lovat as " Bull-trout ". Caught in the beginning of April ; 



testicles entirely collapsed. 

 "Whilst this sheet was passing through the press, Lord Lovat's 

 kindness afforded me an opportunity of seeing other specimens of 

 " Bull-trout " at the moment when taken from the water. It is his 

 opinion that at least some of the fish are hybrids between the Salmon 

 and Sea-trout {S. trutta), an opiuion confii'med by external appear- 

 ance and by the" varying number of pyloric appendages, which, in 

 one specimen, was found to be as low as fifty-four ; yet the relative 

 size of the scales on the tail is in all these Bull-trout the same as 

 in the Salmon. Capt. H. Fraser believes that other specimens of 

 " Bull-trout " are true Salmon which, having gone down to the sea 

 as Kelts, return to fresh water before having attained to the con- 

 dition of well-mended fish. Thus, as regards the river Beauly at 

 least, fishes named " Bull-trout" do not constitute a distinct species, 

 but this name would appear to comprise — 



1. Hybrids between Salmon and Sea-trout. 



2. Specimens of Salmon returning from the sea before being well 

 mended. 



3. Sterile specimens — as, for instance, the specimen (a') men- 

 tioned above. 



