PEISTIPOMA.— DIAGEAMMA. 



127 



spot; a series of round blackish spots at the base of the dorsal fin, 

 between the rajs, sometimes with a second series higher up. 



Total length 290 millim. 



West Coast of Africa, from the Senegal to Angola. — Type in Paris 

 Museum. 



M. P. Delhez (C). 

 W. P. Lowe, Esq. (C). 

 Dr. W. J. Ansorge (C). 

 Mr. J. T. Dalton (C). 



W. A. Forbes, Esq. (P.). 

 G. L. Bates, Esq. (C). 

 Dr. W. J. Ansorge (C). 



Dr. Jackson (C.) ; 



Hon. AY. Rothschild (P.). 

 Capt. Wilverth (0.). 

 R. J. Cumiinghame, Esq. (P.). 

 Dr. W. J. Ansorge (C). 



1-6. Ad. & yg. 



St. Louis, Senegal. 



7. Hgr. 



Nanna Kru, Liberia. 



8. Hgf. 



Degama, Lower Niger. 



9-10. Hgr. 



Niger. 



11. Skel. 



?? 



12. AJ. 



!5 



13. Ad. 



Benito R. 



14. Yg. 



Chiloango Town. 



15. Hgr. 



Chiloango R. at Mayili. 



16. Ad. 



Lo.mgo R., at N'kutu. 



17. Yg. 



Landana, Lower Congo. 



18-19. Yg. 



Banana, Lower Congo. 



20-21. Ad. & hgr. 



Angola. 



22. Ad. 



Quanza R., at Cunea, 



23-24. Yg. 



Angola. 

 Bengo R., at Quifan- 

 gondo, Angola. 



2. DIAGRAMMA. 



Cuv. Regne Anim. 2nd cd. ii. p. 176 (1829); Cuv. & Val. Hist. Poiss. v. p. 290 

 (1830); Giinth. Cat. Fish. i. p. 318 (1859); Bouleng. Poiss. Bass. Congo, 

 p. 388 (1901). 



Body oblong, compressed; scales small or moderately large, ctenoid ; 

 lateral line complete. Mouth rather small, protractile, horizontal ; 

 maxillary folding under the praeorbital ; bands of villiform teeth in the 

 jaws; 4 to 6 pits on the chin; praeoperculum denticulate; no opercular 

 spines. 6 or 7 branchiostegal rays ; pseudobranchiee large. Dorsal 

 with 9 to 14 spines, anal with 3. Ventrals a little behind vertical 

 of base of ventrals, with a scaly basal process. Vertebrae 26-27 

 (11 + 15-16). 



Tropical and subtropical seas, Mediterranean, some species entering 

 fresh waters. Two of these are dealt with here : — 



