OF FISHES FROM LAKE TANGANYIKA. 89 
length. Snout with curved upper profile, shorter than the eye, the diameter of which 
is 22 to 22 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 2 or 4 length of head and # 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, } length 
of head; middle soft rays produced, as long as or a little shorter than head. 
Caudal deeply emarginate, crescentic. Caudal peduncle 13 as long as deep. Scales 
- = 4 29-5 : ; 
finely denticulate on the edge, 37-38 ,3; lat. 1. aes 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 millim. 
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 P. ventralis Blgr., from which it differs in the 
dentition and in the shorter pectoral fin. 
5, BATtHYBATES FEROX Bler. 
Native name: “ Musupa.” 
TREMATOCARA, g. 1. 
Closely allied to Paratilapia, but with the teeth very minute, in a narrow band in 
both jaws, the maxillary entirely concealed under the preorbital when the mouth is 
closed, the muciferous cavities of the top and sides of the skull and of the mandible 
extremely large, as in Accrina, and with a single, incomplete, lateral line. 
6. 'TREMATOCARA MARGINATUM, sp. n. (Plate XIX. fig. 1.) 
Depth of body 33 times in total length, length of head 22 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, pra- and suborbital, praeopercular, aud 
mandibular bones with very large and deep cavities separated by narrow septa and 
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