18/8.] MR. R. COLLETT ON CERTAIN GOBIOID FISHES. 331 



In the Black Sea it was taken in the harbour of Odessa by 

 Kessler in 1859. 



Genus Crystallogobius, Gill. 



Crystallogobius, Gill, Proc. Acad. Nat. Sci. Philad. 1863, p. 269 

 (1863). P 



Body transparent, elongate, strongly compressed, naked, with 

 parallel muscular impressions. The male only dentiferous, the teeth 

 in a single series ; strong canine teeth in the lower jaw. Two 

 separate dorsal fins, the first composed of two spines ; ventral fins 

 united, gill openings wide ; pseudobranchiae present. 



Fig. 3. 



Mature male of Crystallogobius nilssoni, in the breeding-season £. 

 C. nilssoni (Dub. & Kor.). 



1844. Gobius nilssonii, Dub. & Kor. Kgl. Vet. Akad. Handl. 

 1844, p. 53, tab. 2. fig. 3 (Stockh. 1846;. 



1861. Gobiosoma nilssonii, Giinth. Cat. Acanth. Fish. Brit. Mus. 

 vol. hi. p. 86 (Lond. 1861). 



1863. Crystallogobius nilssonii, Gill, Proc. Acad. Nat. Sci. Philad. 

 1863, p. 269 (Philad. 1864). 



1872. Latrunculus nilssonii, Coll. Forh. Vid. Selsk. Christ. 1872, 

 p. 10 (Christiania, 1873). 



1874. Latrunculodes nilssonii, Coll. Forh. Vid. Selsk. Christ. 1874, 

 p. 151 (1875). 



The intermaxillary bones in the male very prominent, short; 

 small teeth in front of both jaws, long canine teeth in the lower 

 jaw. The ventral fins united into a funnel, with the shorter rays 

 towards the body. The first dorsal and the ventral fins in the 

 female rudimentary; the ovaries project far behind the vent. 

 Number of muscular impressions 27. The lower jaw the longer. 

 D' 2, D 2 19 (20) ; C. 8 ( 9 or io) + 15 (14) + 8 ( 9 or io) ; A. 21 ; 

 V. 6 ; P. 30 (31). Lin. lat. 27. Vertebr. 29. M. B. 5. 



A. Remarks on the Synonymy. 



This species was described by von Diiben and Koren in the Vet. 

 Akad. Handl. for 1844, UDder the name of Gobius nilssonii, the de- 

 scription having been taken from half a dozen specimens found off 

 the Bergen coast in 1834-43, although it had earlier, during the same 



