550 SMITT, ARRANGEMENT OF THE GENUS GOBIUS. 



tban half the distance between the tip of the nose and 

 the beginning of tbe first dorsal fin; number of rays in 

 the pectoral fins more than 16. 



«««:Least depth of the tail more than half the distance 

 between the end of the second dorsal fin and the 

 first dorsal supporting ray of the caudal fin. 

 aaaa: Least depth of the tail less than the length 

 of the raandible. 



aaaaa: Longitudinal diameter of the eye more 



than Ys of the length of the head 



reduced. — Gohius Lesueurii, Risso, 



incl. Goh.gracilis, Fr. (Friesii, Malm). 



Varieties: 



1: Nape scaly. 



var. a : Length of the lower jaw 

 more than 48 %, length of 

 the head reduced (from 

 tip of the nose to hind 

 margin of preopercle) 

 more than 78 % of the 

 length of the base of the 

 anal fin — mediterranean. 

 var. ß: Length of lower jaw less 

 than 48 (47.1) %, length 

 of the head reduced less 

 than 78 (77.1) % of the 

 base of the anal fin. — 

 forma Friesii — atlantic, 

 boreal. 

 2: Nape scaleless. 



var. y: Length of the lower jaw 

 less than 48 (47.1) %, 

 length of the head reduc- 

 ed less than 78 (77.1) % of 

 the base of the anal fin. 

 — forma Lesueurii — 

 mediterranean. 



