88 



head the same. Superior processes of the nuchal carapace pointed , 

 not yet reaching as far backwards as the humeral process , which 

 extends a little beyond the first soft dorsal ray and is pointed 

 behind. Length of the snout half the length of the head ; diameter 

 of the eye nearly one-fourth of the length of the head and nearly 

 half the interorbital space , which is flat. Maxillary barbels not 

 fringed , not yet reaching the gill-slit ; mandibulary barbels , specially 

 the inner, thickly fringed with short filaments. Mandibulary teeth 

 circa 30. Pectoral spine verj strong , strongly serrated along both 

 edges, nearly as long as the head and as long as the dorsal 

 spine ; the latter serrated anteriorly towards its point , and posteriorly 

 along its whole margin. Ventrals just reaching the base of the 

 anal; distance between the base of inner ventral ray and anal 

 nearly two-thirds of the distance between the base of inner pec- 

 toral and outer ventral ray. Adipose fin a little more than two- 

 thirds of the length of the head ; the distance between dorsal and 

 adipose fins nearly equals the base of the former. Caudal deeply 

 forked. 



Dark brown (in spirits) with round yellowish spots over the 

 whole body; fins transversely banded with yellowish. 



One specimen, total length 12,5 cm. Length of the body until 

 the base of the outer caudal finrays 9,5 cm, 



Synodontis alherti. 

 D 1/7; A (12) 13; P. 1/8. 



The gill-opening does not extend downwards beyond the root 

 of the pectorals. Mandibulary teeth much shorter than the eye. 



ïïeight of the body one-fifth of the total length, length of the 

 head the same. The superior processes of the nuchal carapace 

 surround the base of the dorsal spine and extend as far backwards 

 as the humeral processes. The latter are provided with a short 

 series of minute denticulations towards the extremity of their 

 inferior edge. Length of the snout a little less than half the length 

 of the head; diameter of the eye three-eighths , equaling the 

 interorbital space , which is a little concave. Maxillary barbels with 



