PHY 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. 



Fig. 241. 



Total length 93 millim. 

 Upper Nile. 



1-2, 3-17. Types. 

 18. Skel. 



Physailia pellucida. 

 Type (F. N.). 



Omdurman. 



L. Lost, Esq. (€.). 



2. PHYSAILIA OCCIDENTALS. 



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

 Physailia occidentalism Bouleng. Fisb. Nile, p. 322 (1907). 



Depth of body 4j 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 SOMALENSIS. 



Ailia somalensis, "Vincig. Ann. Mus. Genova, (2) xvii. 1897, p. 346. 

 Pln/sailia somalensis, Bouleng. Fish. Nile, p. 323 (1907). 



Depth of body 5 times in total length, length of head 6^ times. 



