752 



MR. F. DAY ON HYBRIDS 



[Dec. 19, 



from the lateral line to the base of the ventral fin. Row of scales 

 on the upper half of the body very irregular. Colour : On removal 

 from the water it was silvery with a rich purple gloss, from 7 to 8 

 irregularly placed rows of black spots were present on the fore part 

 of the body, gradually decreasing in number to 3 or even 2 in the 

 caudal portion ; no parr marks on the sides, 4 large black spots ou 

 the opercle and 2 more on the cheeks. Fins greyish, darkest in 



Head of Hybrid Salmon (Tay), cJ. 



the centre, the dorsal with black spots and a white anterior edge. 

 Testicles present but rudimentary, no milt being present. 



December 24th, 1S81, aboat 20,000 eggs of Lochleven Trout were 

 fertilized with salmon-milt; they hatched on March 9th, 1882, or 

 in 75 days. Of these, on November 1 5th about 1250 were alive at 

 Howietouu. The largest example was 4g inches in length, and four 

 of these fish are on the table. 



B. X. D. 13 (t%). p. 13-14. V. 9. A. 1 1 (§). C. 19. 

 L. 1. 116-118. L. tr. 25-26/30-32. Csec. pyl. 61-/8. 



No. 1. No. 2. No. 3. No. 4. 



Length of example 4-3 3-4 4-1 40 



Length of head O'O 07 0-8 O'S 



Length of pectoral fin 08 06 0-6 0(5 



Length from snout to base of dorsal... 1-7 1'4 1-7 1-6 



Length from snout to base of caudal . . . 3'8 3"0 3-6 34 



Diameter of eye 0-2 0-15 0-2 0-2 



Fi-om end of snout 025 0-2 0-2 0-23 



Apart 0-3 0-27 03 03 



Height of body , 0-8 0'65 0'7 07 



In example No. 1 the length of the central caudal ray is half that 



