1884.] ON RACES AND HYBRIDS AMONG THE SALMONID^. 581 



6, On Races and Hybrids among the Salmonidse. — 

 Part III. By Francis Day. 



[Eeceived November 24, 1884.] 

 (Plates LVI. & LVII.) 



On May 20th I read a paper before this Society' wherein I 

 detailed the results of some experiments made at Howietoun on the 

 breeding and hybridization of the Salmonidae. I now propose to 

 continue their history up to the middle of November this year. 



It will be remembered that in December 1880 some ova and milt 

 were obtained from Salmon in the Teith, which were subsequently 

 hatched at Howietoun, and in their early life were kept in the 

 central wooden pond, from which they were transferred to pond 

 no. 7^ During the month of May 1884 16 jumped out of the 

 pond and were found dead, and in all their breeding-organs were 

 observed becoming well developed. 



On August 28th an examination was made of pond no. 7, and a 

 grilse of 1| lb. weight was removed. On being opened it proved to 

 be a female with its ova well forward, the largest being O'l of an 

 inch in diameter. The fish measured as follows : — 



inch. 



Total length 14-1 



Length of head 2-8 



Length of pectoral fin 1*'J 



Length of caudal fin 2*2 



Height of body 3-2 



Eyes, diameter ()-^5 



Eyes from end of snout 0*8 



Eyes, apart Tl 



Distance from snout to first! 

 dorsal fin J 



57 



112 rows of scales along the lateral line, 10 from the adipose 

 dorsal fin downward and forwards to the lateral line ; the rows of 

 scales from the head to the base of the first dorsal fin irregular in 

 their course. The longest outer caudal ray 2'2 inches, middle rays 

 1"0 inch ; length of the base of the first dorsal fin 1'6 inch, inter- 

 space between it and the adipose fin 3'4 inches. Caecal pylori 60, 

 the longest 0'8 inch. Colours — two large black spots behind the 

 eye, one on the upper portion of the preopercle and 2\ on* the 

 opercle ; numerous black spots on the body above the lateral line, 

 and anteriorly a few halfway down to the abdominal edge, and some 

 in one line posteriorly. Dorsal fin grey with a lightish edge, and a 



1 See Pi-oc. Zool. Soc. 1884, p. 376. 



2 See Proc. Zool. Soc. 1884, pp. 20, 21. 



