Reproductive Organs oj Spams Gent rod ontns. 17 



In the Iceland fish the orbit was 7 6 to 8'5 per cent, of the lengtli of 

 the fish. Then the distance from the tip of the mandible to the 

 anterior edge of the orbit was 57 to 7'3 per cent, of the length in the 

 small fishes, while in the large specimens it was from 8 to 87 per 

 cent, of the corresponding distance. The ventral ramus of the tail of 

 the Iceland specimens Avas a little longer than that of the small fishes. 

 I do not think that these differences are of specific value. 



The details of the measurements expressed in percentages of the 

 length of the fish are given in the following table. Certain measure- 

 ments were made on the Iceland fishes alone. They are included here, 

 as they may be useful for comparison with other specimens : — 



I Table. 



