578 Appendix. 



Description of a new Fi#h of flie genus Mostt-eml>elus, from the 

 Zambezi Myxtem. By G. A. BOULENGEK, LL.D., F.R.S. 



MASTACEMBELUS THOMPSONI. 



Depth of body 21 times in total length, length of head 8i times. 

 Vent equally distant from end of snout and from caudal, its distance 

 from head 3 times length of latter. Snout 3 times as long as 

 eye, ending in an appendage as long as eye ; mouth extending to 

 below anterior border of eye ; no praeorbital or praeopercular spines. 

 Dorsal xxxii 95 ; spines increasing in length, last 4- length of head ; 

 distance between first spine and head | length of latter. Anal ii 95. 

 Caudal rounded. Pectoral i length of head. Scales very small. 

 Blackish brown above, greyish-white beneath. 



Total length 265 millim. 



A single specimen, from Sesheke, N. Rhodesia (Rev. L. Jalla). 



Although 34 African species of this genus are now recognised, only 

 two were known from the Zambesi system M. sliironus, Grthr., from 

 Lake Nyassa and the Upper Shire, and M. inellandi, Blgr., originally 

 described from the Solwesi River in North Rhodesia (Congo water- 

 shed), but since recorded from Lialui, Upper Zambesi. 



M. tltom^isoni, named in memory of the late W. Wardlaw Thompson, 

 is allied to M. *///;//*, M. niyromarginatus, Blgr., M. victor iae, Blgr., 

 and M. moeruensis, Blgr., and most nearly to the latter, from which 

 it differs chiefly in the more numerous fin-rays and in the more 

 numerous and longer dorsal spines. 



M. Jalla of the Paris Mission Society, Sesheke, has kindly supplied 

 i he Barotse names for the following fishes. [EDITOR.] 



.M<irrnxi'iiiti* castelnaui, Blgr. ... 



f* inir/ni.'tiii.', Guhn.... ... 



niloe, Bl. ... 



II !/<lroci/on Intent tin, Blkr. //</ //>/. 



Cl<irix inofofunihirns, Petors ... mim/n. 



Auchenoglanis //ijttm</i*ix, I>lgr. ... ... Setigongi-wanqa. 



