BY W. MACLEAY, F.L.S. 265 



distance behind the head. Eibs present. Gill-openings confluent 

 into one slit situated on the ventral surface. Air-bladder none. 

 Stomach without ca>cal sac, or pyloric appendages. Ovaries with 

 oviducts. 



Genus Symbranciius, Bl. 



Body naked. Four branchial arches with well developed gills. 

 No accessory breathing sac. Gill-membrane free from the isthmus. 

 Palatine teeth in a band. 



Warm Seas. 



907. Symbranchus gutturalis, Eichards. 



Yoy. Erebus and Terror, Fishes, p. 49, pi. 30, figs. 14-17. 



Body cylindrical ; tail compressed. The colour is of an uniform 

 liver brown, slightly paler along the ventral line and darker 

 towards the tip of the tail. The throat and cheeks with the snout 

 are bluish-grey, mottled thickly with brown spots and lines. The 

 eyes are small and situated near the snout. 



Dampier's Archipelago. Port Darwin. 



Dr. Gunther looks upon this species as identical with Ophisternon 

 hengalensis, M' CI ell., and Si/mbranchus immacidatus, Miiller. 



Genus Chilobranchus, Eichards. 



Body naked, compressed, subcylindrical in front, moderately 

 elongate. Head small ; snout very obtuse and short ; mouth 

 narrow, with the upper jaw slightly protractile ; eye of moderate 

 size. Teeth in the jaws in a single series ; none on the palate. 

 Gill-opening transverse, the gill-membrane not attached to the 

 isthmus ; hinder edge of the gill-opening with a raised lip. Four 

 branchial arches, no slit behind the fourth ; gills well developed ; 

 no accessory breathing-sac. Vent in the anterior half of the total 

 length, with a minute papilla. Vertical fins reduced to a simple 

 cutaneous fold, without rays. Intestinal tract straight — the 

 R 



