ODAXOTHEISSA.— MIOROTHEISSA. 



161 



Anal 21-22. Pectoral | length of head, not reaching ventral. Caudal 

 deeply forked, with pointed lobes. Caudal peduncle a little longer than 

 deep. 44-46 scales in longitudinal series, 14 in transverse series ; 17- 



Fig. 128. 



v^'.# ?- 



Odaxothrissa losem. 

 Type (A. M. C). f 



18 keeled scutes between isthmus and ventrals, 9-10 between ventrals 

 and anal. Olive-brown above, while beneath ; a more or less distinct 

 silvery lateral band. 



Total length 160 millim. 



Upper Congo. — Types in Congo Museum, Tervuei'en. 



1. One of tJie types, Coquilhatvilk. M. V. Delbez (i).). 



2. Ad. Banzyville, Ubanghi. 0;ipt. Royaux (C). 



4. MICROTHRISSA. 



BoHfeng. Ann. Mus. Congo, Zool. ii. p. 26 (1902). 



Mouth moderately large, with a series of. sharp conical teeth in each 

 jaw ; maxillary toothless, formed of two pieces ; small teeth on the 

 palatines, none on the tongue. Branchiostegal rays 6. Body strongly 

 compressed, with an abdominal serrature formed of bony scutes ; scales 

 moderate ; no lateral line. Dorsal fin short, behind vertical of ventrals ^ 

 anal rather long, with 23 to 25 rays. Ventrals with 9 rays. 



Congo, 



1. MICROTHRISSA ROYAUXL 

 Bouleng. 1. c. pi. viii. fig. 1. 



Depth of body 3 to 3^ times in total length, length of head 3^ to 4 

 times. Snout rounded, shorter than eye, which is 3 to 3 j times in length 

 of head and a little greater than interorbital width ; jaws equal in front ; 



VOL. I. M 



