235 



base of the two dorsal ßns and the anal fin prove to be un- 

 influenced by diff'erences in age and sex, but are subject to 

 greater or less individual variation. 



The horizontal diameter of the eye is larger in the young 

 ones than the minimum interorbital width of the front; in 

 middle sized specimens the two measurements are about equal; 

 in adult specimens the interorbital width is a little larger than 

 the horizontal diameter of the eye. 



The anal fin starts farther to the front in the young ones 

 and young specimens than in the adults, its distance from 

 the end of the snout being in the former ones 46.9 — 49.1 '^/o, 

 in the latter ones 49.4 — 54.2 °/o of the total length. 



The tail is in quite little young ones (68 — 76 mm. long) less 

 slender than in larger young ones and the adults, as its mini- 

 mum height in the former ones is 4.4 — 4.2 "/o, in the latter 

 ones 3.9 — 3.3 °/o of the total length. 



The length of the pectoral fins amounts in the young ones 

 and young specimens to 21.3 — 23.7% of the total length, in 

 the females to 24.6 — 21.8% (decreasing with age), in the males 

 to 24.3 — 26.8 %. The length of the ventral fins amounts in the 

 young ones and young specimens to 10.3 — lô^/o, in the females 

 to 15.5—12.9%, in the males to 16.5—18.2%. The height of 

 the 1"* dorsal fin amounts in the young ones and young speci- 

 mens to 8.2 — 9.2 % Ч, in the females to 8.6 — 7.3 %, in the 

 males to 11.3 — 8.8%. The height of the 2°^ dorsal fin in young 

 ones and young specimens amounts to 11.5 — 17.2 ^), in the 

 females to 14.1— 16.9 o/o, in the males to 23.5—27.1%; the 

 height of the anal fin in young ones and young specimens 

 amounts to 8.1 — 10.2 %V) in the females to 9.1 — 9.9%, in the 

 males to 11.2 — 15.7%. Thus it holds good with regard to all 



Here \se do not take into consideration the specimen of 157 mm. which 

 already distinctly shows male characters, as the height of the 1^* dorsal 

 fin amounts to 9.6 "/o, the height of the ■2'^'^ dorsal fin to 19.i %, and 

 the height of the anal fin to 10.8 "/o of the total length. 



