158 SILTTRID^E. 



8. East Indian species. 



34. Alius truncatus. 



Arms truncatus, Cuv. Sf Val. xv. p. 64 ; Cant. Mai. Fish. p. 256 ; Bleek. 



Nat. Tydschr. Nederl. Ind. iii. p. 426, and Ail. Ichth. Silur. p. 33. 



tab. 56. 

 Cephalocassis truncatus, Bleek. Prodr. Silur. p. 108. 



B. 6. D. 1/7. A. 23-24. P. 1/9. Vert. 15/33. 



The height of the body is one-half of the length of the head, which 

 is one-third of the total (without caudal) . Head elongate and de- 

 pressed, its greatest depth being two-thirds of its width ; the latter 

 is contained once and two-thirds in its length. Snout broad, of 

 moderate length, spatulate, its length being one-fourth of that of the 

 head. The diameter of the eye is one-seventh or one-tenth of the 

 length of the head ; interorbital space convex ; the upper eyelid is 

 broad, transparent. The teeth on the palate are 

 villiform and confined to the palatine bones, .where 

 they form an oblique elliptic short patch on each 

 side. The maxillary barbels extend to, or scarcely Q < \\ 



to, the operculum ; the outer and inner mandi- 

 bulary barbels are nearly of equal length, half as long as the head. 

 The crown of the head is granular ; the occipital 

 process is narrow, oblong, about thrice as long as 

 broad ; basal bone of the dorsal spine small, cres- 

 cent-shaped. Dorsal spine strong and long, four- 

 fifths of the length of the head, serrated along both 

 edges ; the first soft dorsal ray as long as the head. 

 Adipose fin very short and elevated. Caudal forked, 

 with the lobes obtusely rounded, short, its length 

 being one-half of that of the head ; the upper lobe 

 sometimes produced into a short filament. Pectoral 

 spine as strong as, but much shorter than, that of 

 the dorsal fin, serrated along both edges. Ventral 

 shorter than pectoral. Fins whitish. 



East Indies. 

 a-b. From 9 to 12 inches long. Siam. Purchased of Mr. Jamrach. 

 &-d. Adult and half-grown: skins. Pinang. From Dr. Cantor's 



Collection. 

 e. Half-grown. From Dr. P. v. Bleekcr's Collection. 

 /. Adult : skeleton. Siam. Purchased of Mr. Jamrach. 



35. Arius caelatus. 



Arius coelatus, Cuv. fy Val. xiv. p. 66 ; Bleek. Atl. Ichth. Silur. p. 35. 

 tab. 53. 



sequibarbis, Cuv. 8f Val. xiv. p. 68. 



granosus, Cuv. 8f Val. xiv. p. 69. 



ccelatoides, Bleek. Verh. Bat. Gen. xxi. Silur. Batav. p. 32. 



microgastropterygius, Bleek. I. c. p. 33. 



clypeaster, Bleek. I. c. p. 34. 



■ clypeastooides, Bleek. I. c. p. 34. 



