138 SILURIDJ5. 



pose fin is two-sevenths or one-fourth of the total (without caudal) ; 

 it is very high in adult examples. Anal fin much higher than long. 

 Caudal subtruncated. Brownish ; fins with rounded dark spots. 

 Nile ; Senegal. 



a, b-e. Fine specimens. Chartoum. From Consul Petherick's Col- 

 lection. 



/. Adult. West Africa. Purchased of Mr. Dalton. 



g. Twenty-six inches long: stuffed. Seneg'tl. Purchased of M. 

 Parzudaki. 



Eighth Group. ARIINA. 



Proteropterous Siluroids with the anterior and posterior nostrils 

 placed close together, and without nasal barbel, the posterior 

 nostril being provided with a valve. 



59. ARIUS*. 



Bagrus, sp., et Arius, Cuv. 6} Vul. 



Bagrus, sp., Sciades, sp., Ariodes et Arius, Miill. fy Trosch. 



Ilexanematichthys, Guiritinga, Sciades, Arius, Hemiarius, Cephalo- 



cassis, Netuma, Ariodes, et Pseudarius, Bleek. Nederl. Tydschr. 



Dierk. 1863, p. 90. 



Adipose fin of moderate length or short ; a short dorsal fin with a 

 pungent spine and with seven (sixf) soft rays ; anal fin rather short. 

 Head osseous above ; barbels six, four at the mandible. Teeth on 

 the palate fixed ; the upper jaw is the longer. Eyes with a free 

 orbital margin. Caudal fin forked ; ventral with six rays, attached 

 behind the vertical from the dorsal. 



Tropical regions. 



* a. Teeth on the palate villiform or cardiform. 



1. Bagrus trachipomus, C. $ V. xiv. p. 443.— Bengal. 



2. Chinta-jellah, Russell, pi. 167. — Bagrus chinta, C. % V. xiv. p. 445. — 



Coromandel. 



3. Bagrus pemecus, C. # V. xiv. p. 456. — Cayenne. 



4. couma, C. $ V. xiv. p. 459. — Cayenne. 



5. Arius subrostratus, C. # V. xv. p. 62.— Malabar, 

 ti. rostratus, C. $ V. xv. p. 63. — Alipey. 



7. belangerii, C. $ V. xv. p. 71.— Bombay. 



8. Leptarius dowii, Gill, Proc. Acad. Nat. Sc. Philad. 1863, p. 170.— West 



coast of Central America. 



9. Arius nigricans, Valenc. in d' Orb. Voy.Amer. Merid. Atl. Poiss. pi. 3. fig. 3 ; 



C. $ V. xv. p. 83. — South America. 

 10. Silurus quadrimaculatus, Bl. tab. 368. fig. 2 ; Bl. Sehn. p. 383. — Pime- 

 lodus quadrimaculatus, C. 4" V. xv. p. 185. — America. 



)3. Teeth on the palate granular. 



1. Pimelodus jatius, Ham. Buch. pp. 171, 376. — Arius jatius, Bli/th, Calc. 



Journ. As. Soc. Beng. xxix. p. 151. — Ganges. 



2. Arius molliceps, C. # V. xv. p. 108.— Hub. ? 



3. puncticulatus, C. $ V. xv. p. 108. — Buenos Ayres. 



t All the species examined by myself have seven dorsal rays ; Valenciennes 

 however, mentions six only in several South American species. 



