18 SILURID.E. 



(without caudal) ; its width between the gill-openings is two-thirds 

 of its length. Barbels long : the nasal extending to the base of the 

 occipital process, and that of the maxillary to, or nearly to, the ex- 

 tremity of the pectoral. The pectoral spine is very finely serrated, 

 the serrature being hidden below the skin ; its length is three -fourths 

 of that of the fin. 



Bengal, Khasya. East Indian Archipelago. 



a, b. Adult and half-grown. Ganges. Presented by G. B,. Water- 

 house, Esq. — Types of M. magur, Ham. Buch. 



c. Half-grown. Calcutta. From the Collection of Messrs. von Schla- 



gintweit. 



d. Half-grown : skin. Pinang. From Dr. Cantor's Collection. 



e. Young. Khasya. Presented by Sir W. Hooker. 



/. Adult. East Indian Archipelago. From Dr. P. v. Bleeker's Col- 

 lection. 

 g-k. Adult and half-grown : stuffed. India. 

 l-m. Half-grown. From the Haslar Collection. 



11. Clarias macrocephalus. 

 D. 70. A. 50. P. 1/8. 



Caudal fin free. Vomerine teeth small, obtusely conical, forming 

 a crescent-shaped band which, in its middle, is rather broader than 

 that of the intermaxillaries, and which has no process behind in the 

 middle. Head finely granulated above ; its length to the end of the 

 occipital process is one-fourth of the total (with the caudal); the height 

 of the body is one-sixth of the total in adult specimens. Occipital pro- 

 cess very obtuse and rounded in adult specimens, rather more promi- 

 nent in younger individuals. The width of the head between the gill- 

 openings is two-thirds of its length (to the end of the occipital process), 

 its width between the eyes is two-fifths of its length. Barbels of 

 moderate length : those of the nostril extend to, or somewhat beyond, 

 the gill-opening ; those of the maxillary to the middle or to the end 

 of the pectoral. The pectoral fin reaches a little beyond the vertical, 

 from the origin of the dorsal fin ; its spine is nearly smooth, the fine 

 serrature being hidden below the skin ; its length is three-quarters 

 of that of the fin. Uniform blackish brown, lighter below. 



Siam. 



a-b, c-d. Adult (12-13 inches long) and half-grown. Siam. Pur- 

 chased of Mr. Jamrach. 



12. Clarias fuscus. 



Macropteronotus fuscus, Lacep. v. p. 88. pi. 2. fig. 2. 



Clarias pulicaris, Richards. Voy. Staph. Fish. p. 135. pi. 62. figs. 5 & G. 



D. 59-65. A. 44-47. P. 1/9. 



Caudal fin free. Vomerine teeth villiform, forming a crescentic 

 band which is narrower than that of the intermaxillary. Head finely 

 granulated above, its length (to the end of the occipital process) being 

 somewhat more than one-fourth of the total (without caudal) ; its 



