1884.] UYBRIDS AMONG THE SVLMONID.E. 19 



extremity ; a line from the end of the snout to tlie further point of 

 the posterior end of the opercle passes just below the orbit ; half the 

 length of the upper edge of the subopercle equals its greatest depth. 

 Maxilla of moderate strength, and reaching to below the hind edge of 

 the orbit. Teeth — in a double row of about 6 on either side, pass along 

 the anterior two thirds of the body of the vomer, while someare also 

 on its head. Scales — 12 rows pass downwards and forwards from the 

 hind edge of the adipose dorsal fin to the lateral line ; 21 rows pass 

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

 near the hind end of the fish irregular. Colours : very silvery, like 

 a grilse, with G or 7 irregularly distributed rows of black spots on 

 the anterior portion and upper two thirds of the body, decreasing to 

 3 or 4 at the end of the caudal region ; no parr-marks on the sides. 

 Two large black spots on the hind edge of the preopercle, 5 on the 

 opercle, and I on the subopercle. A few small black spots on 

 the top of the head. Lower two thirds of dorsal fin with large 

 black spots and a white anterior upper edge ; the fins generally 

 greyish and darkest in the centre, the anal having a light front edge. 

 Csecal appendages of moderate size. Sex, male. Generative organs 

 rudimentary. 



Last year I also adverted in the same communication to 20,000 

 eggs of Lochleven Trout having been fertilized with Salmon-milt 

 by Sir J. Gibson-Maitland on December 24th, 1881. These eggs were 

 hatched on March 9th, 1882, or in 75 days, and on November 15th, 

 1882, about 1250 young were alive. I exhibited four specimens, 

 varying in length from 3'4 to 4'3 inches. These fish have continued 

 to do well, and are thriving in the upper and centre planked ponds at 

 Howietoun, upwards of 800 being alive. 



I obtained three specimens (on the table), which give the following 

 measurements : — 



B. x-xi. D. 13 (y^). P. 14. V. 9-10. 

 A. 11 (I). C. 21. L. 1. 118. 



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



in. in. in. 



Total length of specimens 7'3 5*7 5*4 



head 1-6 1-2 M5 



pectoral fin 1-05 I'O 0-9 



„ „ caudal fin 1-3 0-9 0-9 



Distance from snout to base of dorsal fin ... . 2'8 2'2 2*2 

 ,, ,, „ centre of base of 



caudal fin 6*2 4'9 4-6 



Diameter of eye 0'3 0*23 025 



Distance of eye from end of snout O'O 0*33 0'3 



Distance of eyes apart 0-6 0*4 0*4 



Height of body 15 1-2 10 



Specimen no. 1 had the teeth in a double row along the body of 

 the vomer. In examining the extent of the emargination of the 

 caudal fin, it was 0*5 of an inch, while the length of the outer rav was 



2* 



