AND HYBRIDISM IN SALMO FONTINALIS. 15 



tioD, because, owing to its roying disposition, the Salmo fontinalis 

 is generally only for some period of its existence retained in 

 ponds. I have been famished with several fine examples from 

 9^ up to 11| inches, and some smaller ones, by Sir Pryse Pryse 

 from Cardiganshire ; and they give the following results : — 

 B. x.-xi. D. 13 (^). P. 12-13. V. 8-9. A. 10-11 (g). 



200-210 



C.19. L.l. T2™. L.tr.lEg. 

 190-200 



Length of head, males 4|, females 4|- to 4|-, of caudal fin 5 to 

 7| in the total length. Mye — diameter 5 to 5| in the length of 

 the head, 1^ diameter from the end of the snout and from its fellow. 

 The maxilla reaches to beneath the hind edge of the eye. Sub- 

 opercle differs, mostly nearly quadrangular ; opercle generally 

 much narrower in its upper than in its lower half. Teeth 

 normal. Fins — all the smaller examples (that is, those most dis- 

 tantly removed from the United-States parent stock) have 2 to 3 

 undivided and 8 divided rays to the anal fin. My American 

 specimen has 3 undivided and 7 to 8 divided rays in the same fin. 

 At Howietoun all I have examined have 8 divided anal rays. If 

 this is invariable, it demonstrates that the fish in this country de- 

 velops the maximum number of its anal fin-rays as found in its 

 native habitat. Caecal appendages 25 in one examined. Scales — 

 42 to 48 rows of scales from the lateral line to the base of the 

 ventral fin ; 21 to 26 rows in an oblique line from the posterior 

 end of the base of the adipose dorsal fin downwards and for- 

 wards to the lateral line. Colours — the smaller ones with light 

 sinuous lines, not seen in the large examples ; covered with light 

 round or oval yellow spots, which occasionally coalesce. 



(3) "What are the characters of this fish kept in this country in 

 ponds wherein there is a plentiful supply of water ? Personally 

 I have only visited one such locality, the magnificent breeding- 

 ponds at Howietoun, from which Sir J. Gribson-Maitland, Bart., 

 has been so good as to furnish me with specimens. These 

 fish, taken in July 1882, varied in length from 7| to 8| inches ; 

 and in every one the ova or milt was well advanced. 



B. x.-xi. D. 13 (^). P. 12. V. 8-9. A. 11(?). C. 19. 



185-206 



L. 1. iijim . L. tr. 13^. Cjec. pyl. 34. 



185-206 

 122-125 . 

 188-200 



Length of head, males 4| to o|, females 5|, of caudal fin 6| 



'35 

 height of body 4| to 5^ in the total length. Eye — diameter 4^ 



to 5 in the length of the head, 1 to 1| diameter from the end of 



