0)1 new Fresliicater Fishes from Portuguese Guinea. 37; 



XLT. — Descriptions of new Freshwater Fishes discovered hy 

 Dr. W. J. Ansorge in Portuguese Guinea. By G. A. 

 BOULENGER, F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



Eepresentatives of the following six new species form 

 part of a large collection made at or near Batata by Dr. 

 Ansorge, and sent by him to the British Museum. Some 

 specimens are from the Geba River, others -from the Culufi 



Petersius septentrionalis. 



Depth of body equal to length of head, 3^ to 3| times in 

 total length. Head twice as long as broad, longer tlian deep ; 

 lower jaw projecting slightly beyond snout ; snout shorter 

 than eye, which is 2|- times in length of head and exceeds 

 interorbital width ; maxillary extending to below anterior 

 border of eye ; outer prEemaxillary teeth 4, alternating with 

 those of the inner row, 8 in number; 8 teeth in lower jaw. 

 Gill-rakers moderately long, 12 on lower part of anterior 

 arch. Dorsal 11 7, originating above ventral, at equal 

 distance from centre of eye and from root of caudal. Adipose 

 tin very small. Anal III 13-14. Pectoral nearly as long as 

 head, not quite reaching ventral. Caudal deeply forked. 

 Caudal peduncle a little longer than deep. Scales 25-26 gt, 1 

 or li between lateral line and ventral. Silvery, finely 

 speckled with brown on the back; a blackish lateral band ; 

 fins white. 



Total length 45 mm. 



Several specimens Irom the Geba and Culufi Rivers. 



The northernmost species of the genus. Distinguished 

 from all the species with alternating praemaxillary teeth and 

 a complete lateral line by the low number of scales in the 

 latercil line. 



Disiichodics atisorgii. 



Depth of body 3| to 4^ times in total length, length of 

 head 4^ to 5 times. IJead longer than deep; snout rounded, 

 not compressed, projecting very slightly beyond mouth, 

 shorter than eye, which is 2^ to 2f times in length of head 

 and equals interorbital width ; maxillary extending to below 

 nostrils; teeth in a single series, 20 or 22 in each jaw. 



