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IV. Second Contribution to the Ichthyology of Lake Tanganyika.—On the Fishes 
obtained by the Congo Free State Expedition under Lieut. Lemaire in 1898. By 
G. A. Bou.tencer, 7. R.S., F.Z.8. 
Received May 13, read May 16, 1899. 
[Puares XVIII.-XX.] 
THE extraordinary richness of Lake Tanganyika in Perciform fishes of the family 
Cichlide, first revealed by Mr. Moore’s collection, reported upon in these ‘Transactions, 
vol. xv. 1898, pp. 1-30, pls. i—viii., is further shown by the collection made in July— 
August 1898 by the Lemaire Expedition at Moliro, at the southern extremity of the 
Lake, already explored by Mr. Moore. Although consisting of no more than 34 
specimens, the collection entrusted to me for description by the Government of the 
Congo Free State contains the types of ten new species, three of which warrant the 
establishment of new genera. These new generaare of further interest in emphasizing 
a feature of the Tanganyika Cichlidw to which I have drawn special attention in my 
previous contribution, p. 2, viz. the extent of the lateral lines in many of the forms 
discovered by Mr. Moore. ‘The knowledge of forms with three lateral lines, a 
condition previously unrepresented in the Cichlidw, adds force to the remarks I have 
made with regard to the morphological significance of the so-called “interrupted 
lateral line.” 
The Lemaire collection is further valuable for the care with which coloured sketches 
of most of the fishes have been taken on the spot by M. Dardenne, the excellent artist 
attached to the expedition. ‘lhese sketches have enabled me to represent some of the 
more strikingly coloured forms in chromolithography. 
In addition to the definitions of the new species, I am able to draw up descriptions 
of the two species of Ectodus of which very incomplete definitions were given in the 
previous contribution, owing to the bad condition of the type-specimens. I have also 
added notes on the known species of which specimens are contained in the Lemaire 
collection, or of which coloured drawings, accompanied by an indication of the native 
names, have been supplied by M. Dardenne. 
VoL. xv.— Part Iv. No. 1.— December, 1899. ) 
