C>0 Mr. C. T. Regan on the Fishes of the 



1. Mastaccmhehts (cou.). 



21. Jlavomaryinatus, Blgr. 1898. Cameroon, Gaboon, Oyowe. 



22. niyronuiryinatiis, Blgr. 1898, Ashaiitee. 



23. ophidiiim, Gtlir. 1893. L. Tanj^anyika. 



Siibord. IX. Plectognathi. 



Fam. Tetrodontid^. 

 1. Tetrodoti, L. 1766. 



1. faJiaka, Hasselq. 1757. Nile, L. Chad, Senegal, Niger. 



2. niht, Blg-r. 1899. Congo. 



3. pustulatiis, Murr. 1857, Old Calabar, Gaboon, 



4. miuriis, Blgr. 1902. Congo. 



VII. — A Revision of the Fishes of the American Cichlid Genus 

 Cichlosoma and of the Allied Genera. By C. Tate Regan, 

 B.A. 



I GRATEFULLY acknowledge the kind assistance given to me 

 in the prepartion o£ this paper by Dr. Steindachner, to 

 whom I am indebted for information as to the number of 

 gill-rakers in the typical examples of Cichlosoma bifasciatum, 

 C. lentiginosum, C. altifrons, and C. Sieboldii, and by Dr. Th. 

 Gill, through whose intervention the British Museum has 

 acquired typical specimens of Cichlosoma centrarchus, C. bal- 

 teatum, C. rostratum, and C. basilare. Dr. S, Garman has 

 very kindly given me information as to the number of gill- 

 rakers and the length of the dorsal spines in C. pavonaceum. 

 In the descriptions of the species the number of scales in 

 a longitudinal series is counted from above the origin of the 

 lateral line to the base of the caudal fin, in a transverse 

 series from the base of the first dorsal spine to the lateral 

 line and thence to the middle of the abdomen. The number 

 of scales in a transverse series between the lateral line and 

 the base of the soft dorsal fin does not include the scales 

 forming the sheath which is usually present at the base of 

 the fin. The length of the last dorsal spine is measured 

 from its tip to its actual base, not to the free edge of the 

 scaly sheath at its base. The caudal peduncle is measured 

 from the level of the base of the last anal ray to the actual 

 base of the middle caudal rays, a point which is easily ascer- 

 tained by bending the fin laterally. I have given a list of 

 the specimens in the British Museum collection on which 

 ray descriptions are founded, with the total length in milli- 

 metres of each. 



