544 SMITT, ARRANGEMENT OF THE GENUS GOBIÜS. 



B: Number of spines in tlie first dorsal fin at niost 7: — 

 Gobionellus, GiR. 

 I, b: Length of the head reduced more than 60 % of the 

 length of the base of the anal fin. 

 Ä: Length of the maxillaries more than 17 % of the length 

 of the body without caudal: — Quietula, JoRD., Everm. 

 B: Length of the maxillaries less than 17 % of the length 

 of the body without caudal. 



B, 1 : Anterior, tubiform nostril placed in the anterior 

 inferior margin of the preorbital — Proterorhinus. 

 nov. subgen. Gobius marmoratus, Pall. — 

 a: Profile of head more or less obtusely rounded. 

 aa: Length of base of anal fin more than 61 % 

 of the distance of this fin from the tip of 

 the nose — var. blennioides (Kessl.). 

 ßß : Length of base of anal fin less than 61 % 

 of its distance from the tip of the nose — 

 var. semilunaris (Heck.). 

 ß: Profile of head anteriorly more or less produced. 

 aa: Length of base of anal fin less than 61 % 

 (but more than 50 %) of the distance of 

 this fin from the tip of the nose — var. 

 nasalis (FiL.) caspia. 

 ßß: Length of base of anal fin less than 50 % 

 of its distance from the tip of the nose — 

 var. nasalis, pontica. 

 B, 2: Anterior nostril placed higher up in the preorbital 

 area, above its lower margin. 

 a: Number of scales in a träns verse Ii ne between 

 the origins of the second dorsal and anal fins 

 more than 14, and above the före part of the 

 anal fins in a longitudinal line of the length of 

 Vio of the length of the body (without caudal), 

 more than 6. 



