BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 24. AFD. IV. N:0 3. 25 
not reckoned it in my measurements of this fin, but in the 
dorsal fins it is more developed, especially in C. gobio, where- 
fore I have in these taken both the measurements. 
C. poecilopus. | C. gobio. 
RAGE the body i ER | 7] 45,21 57,5) 76,11 42,51 57,9 (05 
ength of the body in millimetres . . . je 43,4 62,7| 76,1] 42,41 58 |75,8 
Length of the first dorsal fin (measured be- | 
tween the outermost rays) in 4 of that [| 12,6) 13,4] 14,5) 11 12,1112,5 
DÄKGCDeR Dodd vä so dt koda forska RE 12 | 13,2) 13,4] 14,4| 10,9] 11,4| 12,5 
Length of the first dorsal fin (the appendant 
membrane included) in 4 of that of the Jr 15,9) 16,0] 17,7 15 |15,3|16 
body HISINGEN se gren ve JR lar SE Kö lo 17 165 17,6 14,7 15,3 15,8 
Length of the second dorsal fin (measured 
between the outermost rays) in 4 of that | 729,01 30,0] 29,7 27,7 | 29,7| 29,2 
FRA OLE LAR JUR, BL DEN, . 
SEN 19 29,51 30 |29,8|29,7|28,4| 29,5 
Length of the second dorsal fin (the ap- 
pendant membrane included) in 4 of that fF/ 311 31,4) 31,81 31,6 34,0) 33,7 
Rep DOMVi ru ttelgdekyg a I dffe KONG 
BROR) bor 19 | 31,2) 31,8| 30,7] 33,4| 32,6| 33 
Length of the anal fin (measured between 
the outermost rays) in 24 of that of the [7] 24,9] 25,7) 25,31 21,6) 22,6) 23,3 
RR dillslgsde öra RNE 
TN 19 |25,3| 24,8) 24,6) 21,5) 21,9| 21,2 
Height of the first dorsal fin in Zz of the ja 7,9) 7,9) 8,11 9,1) 3) B4 
NEnotnOkORtIePDOdY a vå sc s 4 eh RE 
Rv OT SGT, GUI) I TS 
Height of the second dorsal fin in 2 of thefg 11,3) 11,5| 11,3) 12,1) 11,5) 11,8 
NenetnROCEEher BOY 4. « <>. 24 ne so . 
Oda SM [2 | 11,9/ 11,8] 10,9) 12,4 12,3] 11,9 
Height of the anal fin in Zz of the length [| 9,6|10,4| 11,3 11,4] 11,6) 12,9 
HUR STO Ny RE a an SR i 
(fd, 43 - 10,01 10,31) 10,1] 10,6) 11,5| 11,8 
From the above table, which shows the length and the 
height of the unpaired fins in proportion to the length of 
the body, we reduce the following: The first dorsal fin in- 
ereases in length with age, in both sexes and in both forms, 
whether the appendant membrane be reckoned or not. 'This 
increase is more regular and more distinct in this fin than 
in the two others. No difference in sex seems to be found 
in the length of the fin, in specimens of any size at least, 
but looking at the table, we find at the first glance that the 
length of the fin is greater in C. poecilopus than in C. gobio 
measured either way. The measurements of the length of 
the fin show a gradual increase from the smallest C. gobio 
