NAVACiA AND WACIIXJA. 



483 



A V (' r a i^ c in 



Longituiilnal (liniiictri- of the I'vcs 



Least brcnilth of tlii' intcrorbitiil s|.;icc 



Length of the suout 



Distance between the first dorsal fin and the tip of the snout 



„ „ „ second ,. ., „ „ „ „ „ ,, , 



.. third „ ,. „ „ „ „ „ „ 



,. „ first aiinl „ „ „ „ „ „ ,, 



Length (if tlic base of the first dursiil liii 



,, .. ,, ,, ,, „ second „ ,, 



!! ». „ „ „ „ (irat anal ,, 



., ., ,. ,, „ „ second ,, 



,, „ ,, longest ray in the first dorsal fin 



„ ,« ,, V »' V M second .. „ 



1- .• V V ., „ „ third „ ., 



>i ;. I. „ „ ,. ,, first anal ,, 



" ■• .1 „ „ „ „ second „ „ __ _ 



pectoral fins 



., ., ,, ventral ,, 



Distance l)etvveen the ventral fins and Ihc beiiinuini; of the anal fin 



Length of the niiildle caudal ravs 



4 specimens 

 of nnvatja 



from 

 Archangel. 



3 specimens 



of v'ochnjn 



from 



Pitlekai. 



in % of the length of the l)odv 



»T '» »» 



T» t? J» 

 T) )) )> 



)» 5» »1 



;i.5 



5.7 



7.7 

 2il.7 



4-2.2 

 04.8 

 43.5 



10.0 



17.2 

 1SI.9 

 14.7 

 lU.:t 



!t.2 



a I 



8.2 



13.1 



11.4 



25.4 



(i.4 



3.6 



7.4 



30. « 

 43.3 

 Go. 2 

 43.1 



l(i..f 

 Ki.ii 



18.7 

 14.:. 

 11.0 



il.li 

 it.l 



SU 



8.1. 



13.7 

 11.4 



23.n 



().8 



\\ e tliii.s fiiul on ;m average that in iracJniJa the \ difference of charactei 

 In-eadth of tlie forehead is comparatively greater than 

 in itavnga, just as it is greater in Gadus o</ar than in 

 the Common Cod; -while, on the other hand, the distance 

 between the ventral tins and the beginning of the anal 

 tin, contrary to the tendency of the changes of deve- 

 lopment and in contradistinction to the relation between 

 Gadiis Of/ac and tlie Cod, is on an average less in 

 irarhiiju than in iiavaga. Only tlie first six of the re- 

 lations given in this table, however, shoM- any constant 



riie maximum and minimum 

 proportions also show that these differences, with the 

 exception perhaps of the sixth, are difficidt to en)])lov 

 in the limitation of the species. Better results are 

 obtained in tlie following table, which is also calculated 

 to give an expression for the tendencv of the changes 

 of growth. This table is based on an examination of 

 twelve specimens, six of Gadus navdf/a, between 171 

 and 240 mm. long, and six of G. gracilis, between 



about" 208 and 382 mm. in length. 



Average in 



Navnf/a. 



Vachnja 



3 specimens. 3 specimens. I 3 specimens. ' 3 specimens. 



Length of tlie body expressed in millimetres _ 



„ ,, ., head ., ,, „ 



Length of the snont in % of the length of the head behind the eyes'' 



Least depth of the tail in 'i of the length of the lower jaw ' 



,, ,, „ ,, ,, ,, ,, ,, ,, snonf' 



„ breadth of the interorbital space in % of the length of the snout'. 



,, „ „ head'.. 



J» )5 )» 



19-2.3 

 42.8 

 68.7 

 35.8 

 47.0 

 75.1 

 25.7 



-227 r 

 .50.3 

 70.7 

 38.7 

 49.6 

 73.7 

 25. .^ 



" The body is so distorted in the siiinllest specimens that its lengtl; cannot be fixed exactly. 

 iiavaya = 68'2 %, niaxiinuin = 72' 1 °i. 

 iradinja^ 65'5 %, iniiiinuun = 01.8 "<,. 

 navaga = 39" 1 %, miniiumn = 34-3 %. 

 u-achnja=: 41-1 %, niaxiniiini = 45-4 %. 

 navaga = 50 %, iiiiiiiiiuini = 46'1 %. 



* Mitiinnnn in 



Maxiniuiii ., 



■^ Maximuni ., 



Miniiniini ,. 



'' Maxiniiiiii ., 



Minimum ,, 



' Maximum ,, 



Minimum ,, 



■'' Maximum ,, 



Minimum ,. 



irachiija = o2'6 °a, maximum = GO °i. 

 navaga = 78"1 fj, minimum = 69-4 %. 



vachnja ■ 

 navaga ■ 

 rrarhnja - 



80 ?», maximum = 88-8 f,. 

 26'4 K, minimum = 24 %. 

 2G.7 "o, maximum ^= 289 "L 



•242? 

 53.7 

 64.8 

 42.3 

 .56.8 

 86.3 

 27.9 



358 

 79.6 

 63. 

 43.3 

 56.9 

 82.7 

 27.S 



