14 R. COLLETT. M.-N. Kl. 



Structure of the Body. 



The length of the head is greatest in the males, in which it is con- 

 tained 4.4 to 4.7 times in the total length 1. It is comparatively lesser 

 in the females (especially in the largest individuals), and is contained 

 occasionally 4.7, but as a rule 5 to 5.3 times in the total length. 



The height of the body is least in males, greatest amongst the 

 females. Measured over the anus it is about equal in both sexes, and 

 in average sized exemplars is contained 9.5 to 10 times, and in large 

 specimens from 10 to 10.5 times in the total length. 



The tail is considerably longer than the head and body together 

 (which is contained from 2.4 to 2.6 times in the total length). Anus 

 thus lies considerably nearer the end of the snout than the caudal. 



In the very young, the proportions of the body are about the same 

 as in old individuals; viz.: 



Total length 43 mm.; length of head 9 mm.; end of snout to 

 anus 16.5 mm 



Total length 47 mm.; length of head 9 mm.; end of snout to 

 anus 17 mm. 



Total length 60 mm.; length of head 12 mm.; end of snout to 

 anus 22 mm. 



In these three specimens, the length of the head is thus contained 

 in the total length from 4.7 to 5.2 times, and the body's ante-anal 

 portion 2.6 to 2.7 times. 



Colouration. 



a. Fry: unknown. 



b. Very young individuals. Two specimens examined were of a 

 total length of 43 to 47 mm. (Dröbak 1865; Trondhjcm Fjord 1894). 



The colour is whitish, with 8 to 10 almost quadratic (or, down- 

 wards, somewhat pointed) cross bands, the first immediately behind the 

 neck, the last forming a trifling dark point on the tail. 



In colour, these cross bands arc dark greyish brown, darkest in 

 the margins which can be almost black, lightest in the centre. Two 

 belong to the body proper, the others to the tail portion. The fore- 

 most bands stop at the median line, the hindermost run down to or 

 beyond the anal. 



> In a young male, of a total length of 137 mm. the head is contained 4.89 times in 

 the total length. 



