552 SMITT, ARRANGEMENT OF THE GENUS GOBIUS. 



nose and the origin of the first dorsal 

 fin — forma africana (Cameroon — 

 raediterranean?). 

 ßß'. Number of scales in a trausverse row 

 between the origin s of tlie second dorsal 

 and anal fins less tlian 10. Före part of 

 back and nape scaleless. Paragohiodon, 

 Blkr. 

 B: Caudal peduncle long: length of the dorsal margin of the 

 caudal peduncle more than 15 % of the length of the body. 

 a: Length of the lower jaw more than 14% of the length of 

 the body (without caudal fin). — Glossogobhcs, GiLL. To 

 this subgenus belongs the Gohius colonianus, RiSSO. 

 h: Length of the lower jaw less than 14^ of the length of 

 the body. 



aa: Least height of the tail more than 60% of the length 

 of the base of the anal fin. 



aaa: Length of the base of the anal fin less than 14% 

 of the length of the body (without caudal fin) — 

 Cephalogobius, Blkr. 

 bhb: Length of the base of the anal fin more than 

 14 % of the length of the body. 

 a : Interorbital breadth more than 20 % of the 

 length of the head. — Mugilogobius, n. subg 

 from India and Japan. 

 ß: Interorbital breadth less than 15 % of the length 

 of the head. 



aa: Length of the ventral fin more than 33 % 



of the distance between the tip of the nose 



and the origin of the anal fin. 



aaa'. Length of the dorsal margin of the 



caudal peduncle more than 26 % of the 



length of the body (without caudal); 



least depth of the tail less than half 



the length of that margin; length of 



