6. CHACA. 29 



Third Group. CHACINA. 

 The gfill-membranes are confluent with the skin of the broad 

 isthmus, the gill-openings being thereby reduced in extent. The 

 dorsal and anal are divided into two portions : the anterior of the 

 former fin with a strong spine, whilst the posterior of both fins are 

 united with the caudal. Ventrals six-rayed. 

 East Indies. 



6. CHACA. 

 Chaca, Cuv. ^ Val. xv. p. 444. 

 Head exceedingly large, broad, and depressed ; cleft of the mouth 

 very wide, with the lower jaw prominent, and with bands of villiform 

 teeth in both jaws ; no teeth on the palate. Eyes rudimentary. 

 Barbels six, small : one to each angle of the mouth, and two paii-s 

 at the lower jaw. Gill-opening rather narrow, not extending to 

 the lower side of the head. 

 East Indies. 



1. Chaca lophioides. 



Cuv. (§• Val. XV. p. 445. pi. 451 ; Valenc. in Belang. Voy. Ind. Orient. 

 Zool. Poiss. pi. 4. fig. 2 ; ? Kner, Sitzgsher. Wien. Acad. 1855, xvii. 

 p. 101. taf. 1. figs. ^6. 



ID. 1/4. 2D.-I-C.-1-2A. 25 + 104-12. 1 A. 10. P. 1/5. V. 6. 



Head and body with a few series of short fleshy tentacles. 

 Bengal. (Borneo ?, New Guinea ?) 



a. Adult: stuffed. Nepal. Presented by B. H. Hodgson, Esq. — This 

 specimen is not sufficieutly weU preserved to enable us to count 

 the fin-rays, and therefore the determination is doubtful. 



2. Chaca bankaneusis. 



Bleeker, Nat. Tydschr. Nederl. Ind. iii. p. 455 & viii. p. 165, Pi-odr. 

 Silur. p. 323, and Atl. Ichth. Silur. p. 96. tab. 95. fig. 1. 



ID. 1/3-4. 2 D.-I-C. + 2 A. 22-24 + 11 + 11-12. 1 A. 9. 

 P. 1/4. V. 6. 

 Head and body granidar, ■\\athout tentacles. 

 Sumatra, Borneo, Banka. 



a. One of the typical specimens. From Dr. P. v. Bleeker's Collection. 

 h, c, d. Adult and half-grown. Borneo. 



3. Chaca buchanani. 



Platystaciis chaca, Ham. Btich. pp. 140, 374. pi. 28. fig. 43. 



ID. 1/4. 2D. + C. + 2A. 18 + 11 + 8. 1 A. 8. P. 1/5. V. 6. 



Head and body with series of short fleshy tentacles; eye sur- 

 rounded by a ring of small tentacles. 

 Ganges. 



a. Adult. Ganges. Erom Mr. M'Clelland's Collection. 



