100 



Part III. — Twenty-sixth Annual Report 



The colour of the peritoneum. 



The number of the lobes of the urinary bladder. 



Position of the ureter with respect to the .swim-bladder. 



Number of pyloric cseca. 



Shape of the ovary. 



Shape of the abdominal cavity. 



Standard — the Length of the Fish. 



All the measurements have been represented as percentages of the 

 length of the fish. The length is measured from the anterior end of the 

 fish, mouth closed, to the end of the middle rays of the tail fin. 



These have been summarised, and the range of variation with the 

 number of variants for each species is shown in the following table. 

 There are also included the ranges of variation for the Gadids treated in 

 the two previous papers. From the latter the number of variants is 

 omitted, but these can be found in the papers just mentioned. Certain 

 new measurements have been made on the species already treated. 



Measurements Represented as Percentages of the Length of the Fish. 



Range of Variation. 



* The figures within brackets are the numbers of variants. The numbers of the variants for the species already 

 described have been published in the previous papers, 

 t The first dorsal fin was a little frayed. 

 X The barbel was found equal to 1 per cent, of the length of the fish in a virens measuring 9'4 cm. in length. 



