ÖFVERSIGT AF K. VETENSK.-AKAD. FÖRHANDLINFAR 1895, NIO 3. 181 



speciiuen only as a »pug-variety». In some other specimens I 

 have seen a feAv scattered scales on tlie cheeks and the preeoper- 

 culum. The above mentioned have been middle-sized specimens 

 of about 10 cm. length. In the collection are two smaller spe- 

 cimens of 6 cm. length, but the measm-ements of these are about 

 the same, as the length of the nose is contained about 4 and 

 the distance between the eyes 3^/2 times (or a little more) in 

 the length of the head. When therefore Steindachner speaks 

 about specimens 6 cm. long, in which the width of the front is 

 contained 6 times in the length of the head, I suppose they 

 belong to some other form; this he himself suggests as possible. 

 Both small specimens from the Cameroons show scales behind 

 the eyes. 



A black spöt at the upper root of the pectoral is quite 

 distinct on well preserved specimens especially on the young ones. 

 Steindachner does not mention that spöt, but on his photograph 

 of this species the root of the pectoral is darker (1. c. Pl. I. fig. 2). 



Eleotris melanosoma Bleck, seems to be very closely allied 

 to this species. 



The Eleotris from the Cameroons is eaten by the natives, 

 who catch them in small seines and dipnets. 



Eleotris Bilttikoferi is described by Steindachner from 

 Liberia. 



Mastacembelus cryptacanthus GÜNTHER. 



Five specimens from a muddy rivulet Bonge, Cameroons. 



I counted the number of rays and found them as follows: 



in a 3 cm. long specimen: 



D. XXX— 130; A. 11—127; 



in a 4V2 cm. long specimen: 



D. XXIX— 117; A. 11—117; 



in a 6 cm. long specimen: 



D. XXX— 123; A. 11—126. 



The number of rays is thus variable, but seems neither to 

 increase nor to decrease Avith age, it is much larger however than in 

 M. Marchei Sauvage, which species inhabits the rivers of Liberia. 



