310 Mr. G. A. Boulenger on new 



Ptrs. ; H. bimaculatus, Gill ; Lamprologus congoensis, Schilth. ; 

 Channalabes apus, Gthr. ; Schilbe mystus, 0. & V. ; Alestes 

 leuciscus, Gthr. ; Pellonula vorax, Gthr. j Notopterus nigri, 

 Gthr. ; Tetrodon fahaka, Forsk. ; Polypterus palmas, Ayres*. 

 The specimens (thi-ee young, one with external gills) of 

 Polypterus palmas, a species which I have previously recorded 

 from the Congo, are interesting for the number of dorsal 



Ctenopoma Weeksn, sp. n. 

 D. XVI 8. A. IX 9. Sc. 28 f; 1. 1. {§. 



No palatine teeth. Depth of body equal to length of head, 

 2§ in total length. Snout f diameter of eye, which is 3§ in 

 length of head and equals interorbital width ; lower jaw pro- 

 jecting ; maxillary extending to below anterior fifth of eye ; 

 opercle notched, with four small spines above and two below. 

 Dorsal originating above base of pectoral and extending to 

 caudal ; spines subequal, as long as the eye. Brown, with 

 irregular whitish spots and a large black blotch in the middle 

 of the side ; two oblique dark brown streaks behind the eye, 

 the upper ascending to the upper border of the opercle, the 

 lower descending to the angle of the prseopercle ; ventrals 

 black ; lower surface of head and breast silvery, with brown 

 spots. 



Total length 60 millim. 



A single specimen. 



Pelmatochromis Guentheri, sp. n. 



D. XVI 12. A. Ill 7. Sc. 32 \ j 1. 1. |e|. 



Three series of minute teeth in the jaws, the outer series 

 largest. Depth of body 2f in total length, length of head 

 3 times. Snout \\ diameter of eye, which is 3£ in length 

 of head and equals interorbital width ; maxillary extending 

 to below the nostril ; four series of scales on the cheek. 

 Dorsal originating above opercular cleft; spines subequal, 

 half as long as the head. Third anal spine longest, longer 

 than dorsals. Pectoral falciform, as long as the head. 

 Ventral reaching anal. Upper lateral line ending below the 

 last dorsal rays ; lower extending from the shoulder to the 



* Also a turtle not previously recorded from the Congo : Cycloderma 

 frenatum, Ptrs. 



