PHI'S A ILIA. 



301 



Colourless, translucent in life, the air-bladder showing through the thin 

 skin; minute black dots may be present on the vertebral line and near 

 the anal fin. 



Y\<r. 241. 



Total length 93 millim. 

 Upper Nile. 



1-2, 3-17. Types. 

 18. Skcl. 



PJiysailia pelh(cida. 

 Type (F. N.). 



Omdurman. 



L. Loat, Esq. (C). 



2. PHYSAILIA OCCIDENTALIS. 



Ailia occidentalism Pellegr. Bull. Mus. Paris, 1901, p. 331. 

 Physailia occidcntalis, Bouleng. Fish. Nile, p. 322 (1907). 



Depth of body 4^ times in total length, length of head 6 times. 

 Snout a little shorter than eye, which is 3 times in length of head ; 

 jaws equal in front; barbels subequal, extending slightly beyond origin 

 of anal. Pectoral as long as head, the spine feebly serrated on inner 

 side. Anal 61, reaching caudal. Pale olive above, dotted with blackish; 

 sides silvery ; belly yellowish ; an ill-defined blackish spot at the base 

 of the caudal. 



Total length 85 millim. 



Cape Lopez, Gaboon. — Type in Paris Museum. 



3. PHYSAILIA SOMALENiSIS. 



Ailia somalensis, Vincig. Aim. Mus. Geneva, (2) xvii. 1897, p. 3-4G. 

 Fhysailia somalensis, Boiileng. Fish. Nile, {). 323 (1907). 



Depth of body -3 times in total length, length of head 6^ times. 



