550 Mr. C. T. Regan— -^ Spwpsis 



Liocassis siamensis, sp. n. 



Depth of body 4§ iu the length, lengtli of head 3|. 

 Breadth of head 11 in its length, length of snout 3i, diameter 

 of eye 5j, interorbital width 3|. Head covered witli skin ; 

 occipital process nearly three times as long as broad, ex- 

 tending to basal bone of dorsal spine; snout blunt; nasal 

 barbel extending to posterior edge of eye ; maxiHary barbel 

 1^ as long as outer mandibulary, 2^ as long as inner, ex- 

 tending to operculum ; mouth subterminal ; teeth on palate 

 in a curved band as broad as that of the praimaxillarii s, 

 without median process. Dorsal I 7 ; spine strong, feebly 

 serrated behind, | as long as head; adipose fin as long as its 

 distance from dorsal spine. Anal 15. Pectoral spine | length 

 of head; inner edge serrated. Pelvics reaching anal. 

 Caudal forked. Caudal peduncle If as long as deep. Yel- 

 lowish, with brownish cross-bands, which are much broader 

 than the interspaces, one on head, a second from dorsal to 

 pectoral and pelvic fins, a third from adipose fin to anal, a 

 fourth on the caudal peduncle and base of the caudal fin ; 

 rest of caudal pale except for a brownish bar on each lobe. 



A single specimen, 90 mm. in length, from the Bangpa- 

 kong River, tSiam, received in 1897 from the Royal Siamese 

 Museum. 



Liocassis meraheiisis, sp. n. 



Depth of body 4§ to 5 in the length, length of head 3? to 

 3f . Breadth of head If in its length, diameter of eye 8 or 9, 

 interorbital width 5^. Head covered with smooth skin. 

 Snout moderately broad, rounded, projecting a little beyond 

 the mouth ; nasal barbel nearer eye than end of snout, when 

 laid back nearly reaching eye ; maxillary barbel extending 

 to middle or posterior edge of eye ; occipital process three 

 times as long as broad, separated by a space equal to ^ its 

 own length from basal shield of dorsal spine ; clavicular 

 process not extending beyond middle of pectoral spine. 

 Vomerine teeth in a curved uninterrupted band, nearly as 

 broad as that of the prsemaxillaries, without or with a very 

 short and blunt median posterior process. Dorsal I 7 ; spine 

 very feebly serrated behind, about ^ the length of head; 

 adipose fin If or If as long as dorsal, longer than its distance 

 from latter. Anal 14. Pectoral spine from a little more 

 than ^ to § the length of head ; inner edge strongly 

 serrated. Pelvics not quite reaching anal. Caudal forked. 

 Caudal peduncle twice as long as deep. Brownish ; head 

 with small dark spots ; above the lateral line two elongate 



