494 Md. BOUIiENGER ON FISHES [Juue21, 



specimeuof a new British Y\s\x(Ar/jent{na silus), obtained 80 miles 

 south-west of the Scilly Islands. 



Mr. Abbott H. Thayer, of New York, explained his method of 

 demonstrating, by actual experiments, tlie underlying principle of 

 protective coloration in animals, and invited the Members present 

 and their friends to witness an exhibition of his demonstrations 

 which he had arranged with the Secretary to take place in the 

 Society's Gardens next day, at 11.30 a.m. 



Mr. Boulenger read a Report on the Fishes recently obtained 

 by Mr. J. E. S. Moore in Lake Tanganyika. He gave a list of 

 35 species, belonging to the families Serranldce, Cichlidce, Masta- 

 cembelidce, Silundie, Oyprinklrf^ Characinidce, Cyprinodontv/ce., 

 and Folypteridce. The general character of the fish-fauna, so far 

 as had been ascertained, did not differ from that of the fresh waters 

 of Africa, but most of the species were distinct, and the family 

 Cichlidce had furnished types of 10 new genera. 



This paper will be published entire in the Society's ' Transactions.' 

 Diagnoses of the new forms are subjoined. 



SeRKAjS'ID .'E. 



Lates microlepis, sp. n.— D. VII, II 11 ; A. Ill 8 ; Sq. 100- 

 110 ^g^. Distinguished from L. niloticus Hasselq., by smaller 

 scales, a higher spinous dorsal, a longer caudal peduncle, and a 

 truncate caudal fin. 



ClCHLID.E. 



Lamprologus Schilth. — Six new species, which may be distin- 

 guished by means of the following synopsis : — 



I. Caudal rounded or truncate. 



A. Anal v/ith 10 spines. 



D. XIX 8 ; Sq. 4fi ^ ; depth of body 4 times in total 



length L. fasriatus, sp. n . 



D. XX-XXI ; Sq. 32-83 ^ ; depth of body 2j to 



2| times in total length L. compressiceps, sp. n. 



B. Anal with 7 or 8 spines ; D. XIX-XX 8-9 ; 



5—7 



Sq. 33-35 j^-rg ; depth of body 2| times in 



total length L. mnocii, sp. n. 



C. Anal with 5 spines. 



D. XX 8-9 ; Sq 36-40 ~-^ ■ depth of body 3^ to 



3| time.s in total length L. inodestus, sp. n. 



D. XVIII 10-11 ; Sq. 90-95 ^^■, depth of body 4 



times in total length L. elongafiiK, up. n. 



IT. Caudal deeply notched, creseentic ; D. XX-XXI 



7-8; A. VI-VII 6; Sq. 50-54 ^^ L. furcifer, i^. xx. 



