1 92 THE TANGANYIKA PROBLEM. 



dorsals. Caudal with deep crescentic notch. Caudal peduncle 2\ as long as deep. 



6-7 4 ^ 52 



Scales 55 — — ; lat. I 26 . Pale brown above, yellowish beneath ; a small dark 



13— IS 



brown opercular spot ; a round brown spot on caudal peduncle at root of caudal 

 fin ; dorsal fin greyish, the soft portion with round white spots, other fins yellowish. 



Total length, 175 millim. 



Described from a single specimen. Native name, " Murungi." 



59. Trematocara marginatum. — Blgr. 1899. (Fig., p. 179, upper.) 



Depth of body 35 times in total length, length of head 2| to 3. Snout with 

 curved upper profile, shorter than the eye, which is 2h in length of head and 

 exceeds interocular width ; mouth extending to below anterior border of eye ; cheek 

 naked ; a few deciduous scales on the opercle ; nasal, frontal, prte- and suborbital, 

 pneopercular, and mandibular bones with very large and deep cavities separated by 

 narrow septa and covered with a thin skin. Gill-rakers short, 10 on lower part of 

 anterior arch. Dorsal X. 11 ; spines § length of head, a little shorter than the 

 longest soft rays. Pectoral acutely pointed, as long as head. Ventral reaching 

 origin of anal. Anal III. 10 ; third spine nearly as long as dorsals. Caudal with 

 deep crescentic notch. Caudal peduncle lh as long as deep. Scales cycloid, 30! ; 

 lateral line reduced to a few (six or seven) short tubes in the upper series. Pale 

 brownish above, white beneath ; a bluish lateral stripe ; fins yellowish, dorsal and 

 anal edged with blackish. 



Total length, 63 millim. 



Described from two specimens. Native name, " Lilowe." 



60. Trematocara unimaculatum. — Blgr. 1901. (Fig., p. 201, upper.) 



Depth of body 3 to 3J times in total length, length of head 2% to 2% times. 

 Snout with curved upper profile, as long as or a little shorter than the eye, the 

 diameter of which is nearly double interorbital width and contained 3 to 35 times 

 in length of head ; mouth extending to below anterior border of eye ; cheek naked ; 

 a few deciduous scales on opercle ; nasal, frontal, prreorbital, suborbital, prae- 

 opercular, and mandibular bones cavernous, with large cavities covered with thin skin 

 and separated by narrow septa. Gill-rakers short, 17 on lower part of anterior arch. 

 Dorsal X. -XII. 9-1 1 ; spines increasing in length to the sixth or seventh, which 

 measures h length of head ; soft rays scarcely longer. Pectoral very pointed, as long 

 as or a little longer than the head. Ventral reaching origin of anal. Anal III. 7-8 ; 

 third spine nearly as long as dorsals. Caudal deeply notched, crescentic. Caudal 

 peduncle nearly twice as long as deep. Scales 30-32? ; lat. 1. 5-14. Silvery, 

 brownish above, a large rounded black spot on posterior third of spinous part of 

 dorsal, rarely followed by a second. 



Total length, 120 millim. 



Described from several specimens from the Usambura Market. 



