1884.] HYBRIDS AMONG THE SALMONID.E. 587 



inches. 



Length of pectoral fin 1*2 



Length of caudal 1*2 



Length of ventral 09 



Height of body 1-9 



Eyes, diameter of 0*3 



Eyes from end of snout 04 



Eyes apart 05 



Distance from snout to dorsal fin 3'0 



Distance from pectoral to base of ventral . 2'2 



Distance from base of ventral to anal .... 1'4 



The lower jaw slightly deformed, being unnaturally shortened. 

 Teeth — in a transverse row across the head of the vomer, but more 

 along the body of the bone. Scales — 23 rows pass from the base 

 of the adipose dorsal fin downwards and forwards to the lateral line. 

 The dorsal, anal, and other fins are much more developed in these 

 pure Char hybrids than in the Zebra, wherein the Char is crossed 

 with a Trout. Colours of a beautiful iridescent purple, with 13 

 transverse or parr-bands along the sides ; the whole of the body 

 covered with small light spots, none on the fins. Anterior edge of 

 the dorsal, ventral, and anal white, also the outer ray of the pec- 

 toral. A few dark marks along the base of the dorsal fin , all the 

 fins darkest at their outer edges. On opening the specimen, it was 

 found to be a male with the milt very fully developed (Plate LVII. 

 figs. 1, 2). 



November 12, 1884. — Pond no. 4 at Howietoun was again ex- 

 amined : the largest fish was 81 inches long ; most of the females 

 were not quite ready for breeding. 



A female of the Struan breed gave 146 eggs, and these were 

 milted from a male of the same race ; consequently, if fertile, will 

 afford an instance of pure hybrid Char interbreeding. The diameter 

 of the eggs averaged 0'13 of an inch; they were placed in box 92 b. 



4500 eggs were taken from two Lochleven Trout and milted 

 from a male of the Struan hybrid ; if fertile, this will give a pro- 

 portion of three parts Char to one part of Lochleven Trout. These 

 were placed in box 88. 



The eight hybrids, the progeny of the eggs of the American 

 Char fecundated from a Lochleven Trout, are doing well, but are too 

 few in number for a specimen to be yet taken. They much resemble 

 the Zebra breed, and are termed the Leopards. 



It will be as well to again allude more particularly to the very 

 erroneous opinion which was given prominence to by Harmer, in a 

 paper read before the Royal Society, May 28, 1 767, who observed 

 that " it appears that the size of the eggs is nearly the same in 

 great and small fishes of the same species at the same time of the 

 year," and which has continued to be almost universally believed in ; 

 for we still see Dr. Gunther's statement (1880) respecting Teleo- 

 stean fishes that "the ova of large and small individuals of the 

 same species of course do not differ in size" is being referred to as 



Proc. Zool. Soc— 1884, No. XL. 40 



