PHRACTURA. 499 



without free border. Gill-openings narrowly interrupted at the isthmus. 

 Air-bladder absent. 



Vertebra 35-36 (16-17 + 18-20). 



Niger, Cameroon, Ogowe, Congo. 



Synopsis of the Species. 



I. Occipital process not reaching interneural shield ; snout about i length 



of head. 



A. Posterior nostril nearly as distant from eye as the anterior from end of snout. 



1. Occipital process 3 to 4 times as long as broad. 

 Eye 10 to 11 times in length of head, 2| to 3 



times in interocular width ; maxillary barbel 

 § length of head ; caudal peduncle J- total 



length LP. bovei, Perug., p. 499. 



Eye 6 to 7 times in length of head, twice in 

 interocular width ; maxillary barbel i length 

 of head ; caudal peduncle f to -J total 

 length 2. P. lindiea, Blgr., p. 500. 



2. Occipital process about twice as long as broad ; maxillary barbel £ to § 



length of head. 



Eye 6 to 7 times in length of head, twice in inter- 

 ocular width ; caudal peduncle \ to f total 

 length 3. P. brevicauda, Blgr., p. 502. 



Eye 6 to 7 times in length of head, twice in 

 interocular width ; caudal peduncle § to ?■ 

 total length A. P. intermedia, Blgr., p. 503. 



Eye 5i times in length of head, 1^ times in 

 interocular width ; caudal peduncle g total 

 length 5. P. longicauda, Blgr., p. 504. 



B. Posterior nostril close to the eye ; head 



rugose above, with strong ridges ; caudal 



peduncle | total length 6. P. ansorgii, Blgr., p. 504. 



II. Occipital process in contact with inter- 



neural shield ; snout more than \ length 



of head ; maxillary barbel \ length of [p. 505. 



head ; caudal peduncle J total length . 7. P. scaphirhynchura, Vaill., 



1. PHRACTURA BOVEI. 



Peltura bovei, Perugia, Ann. Mus. Genova, (2) x. 1892, p. 972, fig. 

 Pliractura bovei, Bouleng. Ann. & Mag. N. H. (7) vi. p. 528, and Poiss. Bass. 

 Congo, p. 334 (1901). 



Depth of body 8 or 9 times in total length, length of head 6 to 6^- 



2k2 



