1G8 Messrs. E. Loniiberg and H. Rendahl oti 



Willi full certainty tlie relative smallness of the e)'e can be 

 counted as due to tliis fact ; its length is contained ten times 

 in the length of head and four times in the interorbilal 

 width. 



Polypterus congicus, Blgr. 



Native name " Nkungi angandu." 



Locahty. Congo River, Mukimbungu. 



One si)ecimen, 74 cm. in total length (caudal inch). 



Microthrissa eupleui^a, sp. n. 



Locality. Lower Congo. 



Four specimens, the longest about 5 cm. 



Depth of body about 4 times in total length (s. c), head a 

 little more than 4 times in the same. Snout a little shorter 

 than eye. Eye fully 3 times in head. Lower jaw very 

 slightly jirojecting. Tl.ie number of scales in lateral line 

 l)robal)ly only about 30. Ventral scutes 11 in front of ventrals, 

 10 between veiitials and anal ; these scutes extend high up on 

 the sides so as to cover more than § of the space between the 

 ventral keel and the lateral line. Pectoral about f length of 

 head, not reaching ventral. Origin of dorsal about midway 

 between snout and base of caudal. Dorsal rays 11 in number. 

 Distance from snout to vent about twice as long as distance 

 between vent and base of caudal. Ventrals in advance of 

 origin of dorsal. Caudal peduncle about as long as deep. 



Unfortunately the glass in which these specimens were 

 preserved had been broken, so that the specimens arrived in 

 a completely dry state. In consequence of this we had from 

 the begiruiing not intended to do anything with them. As 

 an examination, however, revealed that the number of ventral 

 scutes in all the specimens received constantly differed from 

 that of the two species of Microthrissa hitherto described, and 

 that our specimens thus most easily could be recognized by 

 that characteristic, we were compelled to take up the matter 

 for further consideration. We took also the liberty of sending 

 one of the specimens to Dr. Boulenger, who most kindly con- 

 firmed our view that it re})reseiited an undescribed species of 

 Microthrissa. We are convinced that the above diagnosis 

 will be sufficient for distinguishing the present new species, 

 but the condition of the specimens accounts for the short- 

 comings of the description. 



