4. COPIDOGLANIS. 25 



2. Plotosus canius. 



Plotosus canius, Ham. Buch. Fish. Gang. p. 142. pi. 16. fig. 44 ; Cuv. 



Sf Vol. xv. p. 425 ; Bleek. Verh. Bat. Gen. xxv., iVafes. Beng. p. 125, 



Prodr. Silur. p. 318, and Atl. Ichth. Silur. p. 99. tab. 96. fig. 2 ; 



Kner, Sitzgsber. Wien. Acad. xvii. p. 157. 

 unicolor, (Kuhl fy v. If ass.) Cuv. Sf Val. xv. p. 426; Bleek. Verh. 



Bat. Gen. xxi., Silur. Batav. p. 58. 



horridus, Bleek. I. c. p. 59. 



viviparus, Bleek. 1. c. p. 59. 



multiradiatus, Bleek. I. c. p. 60. 



? Plotosus caesius, Hyrtl, Acad. Wiss. Wien, 1859, xvi. p. 17. 



B. 12. ID. 1/5. 2D. + C. + A. 244-271. P. 1/10-11. V. 12. 



Vert. 15/65 (Hyrtl). 



The length of the head is contained five times and a half in the 

 total length (with caudal), the height of the body nine or ten times. 

 Barbels of moderate length : those of the nostril extend to the nape 

 of the neck, those of the maxillary to the end of the operculum. Eye 

 not covered by the skin, rather small, one-third as long as the snout. 

 The band of intermaxillary teeth is more than twice as broad as long ; 

 the vomerine teeth form a crescent-shaped band. Uniform brownish 

 above. 



Bengal. East Indian Archipelago. 



a. Adult : stuffed. Ganges. Presented by G. R. Waterhouse, Esq. 



b. Half-grown. Ganges. Presented by G. R. Waterhouse, Esq. 



c. Half-grown : bad state. Calcutta. From the Collection of Messrs. 



von Schlagintweit. 



d. Young. Pinang. From Dr. Cantor's Collection. 

 e-f. Three feet long : stuffed. 



3. Plotosus limbatus. 

 Cuv. $ Val. xv. p. 422. 



2D. + C. + A. 224. 



The length of the head is contained five times and a half or six 

 times in the total length. The nasal barbels extend to the posterior 

 margin of the eye, and those of the maxillary to the gill-opening. 

 Uniform dark-coloured ; fins with the margin black. ( V(il.) 



Hindostan. 



4. COPIDOGLANIS. 



A short dorsal in front, with a pungent spine, ; a second long dorsal 

 is united with the caudal and anal into one fin. Teeth in the upper 

 jaw conical, on the vomer molar-like, in the lower jaw mixed. Barbels 

 eight ; nostrils as in Plotosus. Cleft of the mouth transverse. Eyes 

 of moderate size, with a free orbital margin. The gill-membranes 

 are separated by a deep notch, united anteriorly only, the united 

 portion not being attached to the isthmus. The first branchial arch 

 with a fringed membrane along the hinder edge of its concave side. 

 Ventral fins many-rayed. Head rather compressed. 



Coasts and rivers of Australia and of the East Indian Archipelago. 



