OP FISHES fEOM LAKE TANGAA^YIKA. 89 



length. Snout with curved upper profile, shorter than the eye, the diameter of which 

 is 2§ to 2f in length of head and exceeds interorbital width ; maxillary extending 

 to below anterior fourth of eye ; 2 or 3 series of scales on the cheek ; large scales on 

 the opercle. Gill-rakers rather long, lanceolate, 17 or 18 on lower part of anterior 

 arch. Dorsal XII-XIII 12-13 ; spines increasing in length to the eighth or ninth, 

 which measures f or ^ length of head and f longest soft rays. Pectoral a little 

 shorter than head, extending as far as origin of anal. Ventral produced into a long 

 filament, extending beyond origin of anal. Anal III 9 ; third spine longest, f length 

 of head ; middle soft rays produced, as long as or a little shorter than head. 

 Caudal deeply emarginate, crescentic. Caudal peduncle 1^ as long as deep. Scales 



finely denticulate on the edge, 37-38 ^3 ; lat. 1. 14115; upper lateral line not reaching 

 base of caudal. Grey above, white beneath ; four yellowish stripes along each side ; 

 pectorals yellowish ; other fins dark grey or blackish. 



Total length 100 raillim. 



Three specimens. — Native name : " Likuko." 



This species is named in memory of the distinguished young geologist. Dr. De Windt, 

 attached to Lieut. Lemaire's expedition, who was accidentally drowned in Lake 

 Tanganyika. It is very closely allied to F. ventralis Blgr., from which it differs in the 

 dentition and in the shorter pectoral fin. 



5. Bathybates ferox Blgr, 

 Native name : " Musupa." 



Trematocaka, g. n. 



Closely allied to Paratilapia, but with the teeth very minute, in a narrow band in 

 both jaAvs, the maxillary entirely concealed under the prseorbital when the mouth is 

 closed, the muciferous cavities of the top and sides of the skull and of the mandible 

 extremely large, as in Acerina, and with a single, incomplete, lateral line. 



6. Trematocara marginatum, sp. n. (Plate XIX. fig. 1.) 



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

 upper profile, shorter than the eye, which is 2| in length of head and exceeds inter- 

 ocular width ; mouth extending to below anterior border of eye ; cheek naked ; a few 

 deciduous scales on the opercle ; nasal, frontal, prse- and suborbital, prseopercular, and 

 mandibular bones with very large and deep cavities separated by narrow septa and 



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