132 



SCANMMNAVIAN FISHES. 



Length of the body in milliniftres - 



1) Greatest depth of the body in % of the length of the body 



9\ .. „ distance between the first dorsal fin and the tip of the snout . 



, „ length of the body — 



,, „ head ,, 



„ „ lower jaw „ 



»> H )■ 



3) Length 



4) „ 



5) „ 



e) „ 



7) „ 



8) Longitudinal diameter of the eye ,, 



9) „ ., „ „ „ ,. 



11 ») J 



head . 



„ „ distance between the first dorsal fin and the tip of the snout. 



„ „ length of „ second „ „ _ 



„ ,. „ „ the head 



„ „ least depth uf the tail 



10) Distance between the first dorsal fin and the tip of the snout in '/^ of the length of the body 



11) Length of „ „ „ „ ,> „ ., ,, „ n v .i 



12) „ „ „ „ „ „ ., ,> „ :, ., M V low" i«w 



13) „ „ „ „ „ „ ,> „ >. ,. >. V » second dorsal fin... 



in % of the length of the l)ody._ • 



,, ., „ head — 



, distance between the first dorsal fin and the tip of the snout. 



length of the lower jaw _ 



,, ,, „ first dorsal fin 



„ ., ., body.. 



14) Least depth of the tail 

 If.) „ „ „ „ „ 



16) ,, „ „ ., n 



17) n V »» 11 11 



18) „ ., ,. „ ., 



19) Length of the second dorsiil tin 



Trachinus 

 viper a. 



83 

 21.1 

 94.6 

 24.7 



14.7 



59.5 

 (JU.o 

 33.6 

 24.4 

 83. H 

 22.3 

 10.1 

 69.0 

 23.1 



7.2 



29,2 

 32.4 

 49.2 



71.4 



43.7 



Trachinus draco. 



189 



15.3 

 81.7 



22.2 



11.6 



52.4 

 62.0 

 23.6 

 21.0 

 86.2 



18.7 

 9.4 



80.9 

 19.1 



5.4 



24.3 

 28.7 

 4G.4 

 57.3 

 49.2 



2a'cf+19 



Average. 



2cfcf + 19 



229 



17.3 



93 » 



22.5 



11.9 



52.9 

 64.6 

 23.9 

 20.5 

 77.1 



18.4 

 9.4 



79.2 



18.8 

 5.9 



26.5 

 32.4 

 50.2 

 63.4 

 49.9 



285 



16.9 



93.8 

 22.5 



11.6 



51. G 

 64.4 



22.7 



17.8 

 (i9.5 



18,1 



9.5 

 81.7 

 18.7 



5.8 



25.6 

 32.0 

 49,6 

 60.5 

 51.1 



Where the ratios in this table run uniformly through 

 all four columns, rising, as in 19, or falling, as in 8, 

 they naturally indicate a common direction of develop- 

 ment, in which our specimen of Trachinus vipera, as 

 being least, represents the lowest stage; but where this 



is not the case, especially where difference of sex in 

 other fishes, too, takes, a prominent place, as in 2, 6, 15, 

 16 and 17, we see that Trachinus vipera — as far as we 

 can judge from one specimen — represents a branch of 

 development where the male characters are predominant. 



