4. CHILUBUANCHUS, 17 



Synibranchus immaculatus, Miiller, Ahhandl. Ak. Wiss. Berlin, 1839, 

 p. 245 ; Cantor, Mai. Fish. p. 3.'^7 ; lilcek. Verh. Bat. Gen. xxv. 

 Mnr. p. 57 ; or Nat. Tyds. Ned. Lid. iii. Borneo, vi. p. 438. 



gutturalis, Richards. Voy. Ereb. i^ Terr. Fish. p. 49, pi. 80. 



figs. 14-17. 



Tetiabianclius microphthalraus, Bleek. Nat. Tyds. Ned. Ind. ii. p. 69. 



Synbrauclius bengalensis, Bleek. Atl. Ichth. Mur. p. 119, pi. 48. fig. 1. 



Snout very short, subtruncate ; eyes small, close to the end of the 

 snout. Gill-opening of moderate width, extending to the side, or 

 nearly so, of the ventral surface. Vert. 80/53. 



Bengal. East-Indian archipelago. Dampier's archipelago. 



a, h, c, d. Many adult, half-grown, and young specimens. River 

 Hooghly. 



e. Young. Philippine Islands. Purchased of Mr. Cuming. 



/. Young. Dampier's archipelago. Presented by Sir J. Richard- 

 son. — Type of S. gutturalis. 



g. Adult : skeleton. River Hooghly. From the Collection of the 

 East-India Company. 



3. Symbranchus caligans. 

 Cantor, Mai. Fish. p. 334, pi. 7. 

 Snout of moderate length, obtusely pointed ; the minute eye is 

 nearly opposite to the middle of the lip. Gill-opening very wide, 

 extending up the side to the lateral line. 



Pinang. 

 a. Type of the species. From Dr. Cantor's Collection. 



Third Group. CHILOBRANCHINA. 



4. CHILOBRANCHUS. 



Cheilobranchus, Richards. Voy. Ereb. Sf Terr. Fish. p. 50. 



Body naked*, compressed, subcylindrical in front, moderately 

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

 row, 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 ; giUs 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 stomachal dilatation 

 being longer than the intestine proper, and provided with a short 

 caecal appendage near its upper end. 



Australia and Van Diemcn's Land. 



* I am unable to find tlie minute ar-ales mentioned bv Sir. J. Eicliardson. 

 VOL. viir. i^ 



