OF FISHES FEOM LAKE TANGANYIKA. 565 



some quite young specimens. 30 to 35 millim. long, from Mbete. Several specimens 

 bad previously been obtained by Mr. Moore on the Usambara market ; but they were 

 badly preserved, and I took them to be the young of B. ferox. 



Pellegrin has placed Bathybates in his division " Opisthospondyli " 1 . I can see no 

 justification for this course, the vertebral column not differing notably from such forms 

 as Paratila/pia rdbusta and longiceps. Bathybates is more nearly related to Paratilapia 

 than to any other genus, differing chiefly in the longer anal fin and in the dentition : 

 this consists of an outer series of ankylosed teeth, behind which are one to three series 

 of hinged depressible teeth. We are now acquainted with three species, the principal 

 characters of which may be contrasted as follows : — 



I. Spinous dorsal fin not notched, the posterior spines subequal; 3 or 4 series of teeth in the 



upper jaw, 3 in the lower. 



D. XIV-XV 15-16; A. Ill 16-17; Sq. 78-100 J.~%; 13-15 gill-rakers on 



lower part of anterior arch ; interocular width less than diameter of eye. B. ferox Blgr. 



D. XYI 16-17; A. Ill 17-18; Sq. 140-150 .,-3^; 18-19 gill-raters on 



lower part of anterior arch ; interocular width greater than diameter of 



eye B. fasciatus Blgr. 



II. Spinous dorsal notched, the last spine twice as long as the antepenultimate : 2 or 3 series of 



teeth in the upper jaw, 2 in the lower. 



D. XIII 15-16; A. Ill 16-17; Sq. 90-95 -3^; 12 gill-rakers on lower 



part of anterior arch ; interocular width slightly less than diameter of 



eye B. minor Blgr. 



I may here add, as a correction to the original diagnosis of the genus, that well- 

 preserved specimens show the maxillary bone not to be exposed when the mouth is 

 fully closed. 



Haplotaxodon, g. n. 



Mouth nearly vertical, directed upwards, with a single series of small, equal, conical 

 teeth. Maxillary exposed at the end. Body elongate, strongly compressed, covered 



1 So far as I am acquainted with the number of vertebra in the African Cichlida;, the following species 

 only are to be referred to this division : — 



Enantiopus longianalU 14+24 = 38. 



Xenolilapia sima 13 + 22 = 35. 



„ ornatipinnis 14 + 24 = 38. 



Grammatotria A mairii 14 + 22 = 36. 



/',-, matocara unimaculatum 12 + 19=31. 



„ nigrifrotis 13+16=29. 



! pro <' ijpia leptura 15 + 20 = 35. 



All'geiierie forms restricted, accordiug to the present state of our knowledge, to Luke Tanganyika. 



