HYBRIDS— LEOPARDS AND STRUANS. 263 



while another crossed the head, and a dark band ran across the middle of the 

 dorsal fin. I removed three from the box.* 



On November 29th, an example 2'1 inches in length was taken from the 

 remaining 16, the finger marks in this specimen appeared to have been about 12, 

 but were broken up into irregular shapes, reticulated over a yellow ground colour. 

 The back was black spotted. Dorsal fin with two oblique black bands, a light 

 upper edge and a dark spot at the base of its first dorsal rays ; 15 rows of scales 

 between the adipose dorsal fin and the lateral-line. These fish were kept under 

 the same conditions as the Zebra breed, and on March 13th, 1884, only 8 remained 

 and they seemed in rather an unsatisfactory state, and on December 24th, the 

 last eight were shifted to pond 24, and again in 1886, to pond 16. 



Hybrid between British char and Loehleven trout. 



December 5th, 1885. — About 6500 eggs of S. levenensis were milted from a 

 Windermere char which had been kept too long, for although the impregnation 

 was considered good, there was a deficiency of milt ; in 84 days, or on February 

 27th, about 30 hatched ; and on July 30th, 20 were moved to pond 4. December 

 17th, 19 remained and were shifted to pond 23. They were fully as large as 

 yearlings of the true Lochlevens and much more silvery. May 30th, 1887, moved 

 to pond 32. 



Struan Hybrid, or between American and British char, Plate XI, fig. 1. 



Day, Proceedings Zool. Soc, 1884, pp. 38, 379, 586, and plate Ivii. 



November 15th, 1882. — About 9000 ova of an American char, S. fontinalis, were 

 fertilized with the milt of a Scotch char, which had been termed S. struanensis, 

 obtained from Loch Rannoch, and which had been retained in one of the boxes. 

 The milt seemed rather thick, they hatched on February 9tb, or in 86 days. The 

 mortality among the eggs was : November 28, December 309, January 1907, 

 February 130, or a total loss of 2104 eggs, or nearly 1 in 4| ; due probably to the 

 insufficiency of fertilization. There were no considerable amount of monstrosities 

 or malformations. On May 20th, 1883, I received one IJ inches long, having 8 

 broad cross bands and many intermediate smaller ones, no band on the dorsal fin. 

 On July 20th, I received four more of the following dimensions 1'3, 1'8, 2'0, 2'1 

 inches in length, and with from 8 to 11 par bands. In some, these par bands 

 were much more broken up on one side of a fish than they were on the opposite, 

 one had 9 wide ones, another had 6 to opposite the end of the dorsal fin, after 

 which they were broken up. All had the light anterior edge to the first dorsal 

 fin. November 29th, 1883, two more were removed from the tank of 28 and 

 3'0 inches respectively in length.f From 20 to 28 rows of scales between the 

 base of the adipose dorsal fin and the lateral-line. Teeth along the head of 

 the vomer, none along its body. These were kept under the same conditions 

 as the Zebra and Leopard breeds. On March 13th, 1884, 91 lively young 

 fish were transferred to a planked pond at Howietoun, and from among these 



