70 silurid^:. 



fin. No rugose shield between occiput and dorsal fin. Dorsal spine 

 of moderate strength, half as long as the head, not serrated. The 

 adipose fin commences immediately behind the dorsal, and is twice 

 as long as the latter, and nearly as high as the hinder part of the 

 tail. Caudal deeply forked. Pectoral spine as long and strong as 

 that of the dorsal fin, serrated at the inner side of its extremity ; the 

 pectoral fin extends to the vertical from the first soft dorsal ray 

 ventral inserted below the end of the dorsal fin. 

 Nile ; (Senegal). 



a. Fine specimen, 30 inches long. Chartoum. From Consul Pethe- 



rick's Collection. 

 h-<j. Adult, half-grown, and young. Chartoum. From Consul Pc- 



therick's Collection. 

 h, i-k. Adult and half-grown. Lower Nile. 

 7. Adult: stuffed. Assouan. From Dr. E. RuppeH's Collection. 

 m-n. Adult : skeletons. Lower Nile. 



2. Bagrus docmac. 



Silurus docmac, Forsk. p. 65; Bl. Schn. p. 388. 

 Bagrus docmac, Ouv. fy Vol. xiv. p. 404. 



bayad, Hyrtl, Denkschr. Acad. Wiss. Wien. 1859, xvi. p. 17 (Hyrtl 



has evidently confounded this species with B. bayad, Forsk.). 



B. 13. D. 1/9. A. 13. P. 1/10-11. V. 6. Vert. J^. 



The length of the head is contained thrice and three-fourths in 

 the total. Head broader than high, its greatest widtli being two- 

 thirds or three-quarters of its length. Snout spatulate, one-third of 

 the length of the head. The upper jaw is slightly the longer. The 

 maxillary barbel very long, extending to the origin or to the middle 

 of the adipose fin. Head and nape covered with soft skin. Dorsal 

 spine not serrated, of moderate strength, its length being two-fifths 

 of that of the head. The adipose fin commences at a short distance 

 from the dorsal, and is nearly twice as long as the latter, and lower 

 than the hinder part of the tail. Caudal deeply forked. Pectoral 

 spine denticulated along its inner side, as strong as, but rather 

 shorter than, the dorsal spine. The pectoral fin extends to the ver- 

 tical from the first or second soft dorsal ray ; ventral inserted imme- 

 diately behind the dorsal fin. 



Nile. 



a-b, o-f, g-k. Adult, half-grown, and young. Chartoum. From 



Consul Petherick's Collection. 

 /, >n-o, p-t. Adult, half-grown, and young. Lower Nile. 

 u-v. Skeletons of large specimens. Lower Nile. 



29. CHRY3ICHTHYS. 



Chrysichthys et Octonematiehthys, Bleek. Prodr. Silur. p. 00. 

 Melanodactylus, Birch. Nederl. Tydschr. Dierk. 1W>, p. 95. 



An adipose fin of moderate length ; a short dorsal fin with a pun- 

 gent spine and with six soft rays ; anal fin short, with less than 



