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Show 1884.] HYBRIDS A M O N G T H E SALMONID.E. 19 extremity ; a line from the end of the snout to the 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 some are also on its head. Scales-1 2 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 6 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 1 on the subopercle. A few small black spots on tbe 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. Caecal 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 (T\). P. 14. V. 9-10. A. 11 (§). C. 21. L.l. 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 1*15 pectoral fin 1*05 1*0 0*9 caudal fin 1*3 09 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 0*25 Distance of eye from end of snout 0*5 0*33 0*3 Distance of eyes apart 0*6 0*4 0*4 Height of body 15 1*2 1*0 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 ray was 2* >j >» |
