19 6 THE TANGANYIKA PROBLEM. 



63. Gephyrochromis moorii. — Blgr. 1901. (Fig. p. 193.) 



Depth of body equal to length of head, 3 times in total length. Snout with 



slightly convex upper profile, as long as the diameter of the eye, which is contained 



3s times in length of head, and equals interocular width ; maxillary extending to 



between nostril and eye ; 56 conical teeth, with brown points, in the upper jaw ; 



three series of scales on the cheek ; larger scales on the opercle. Gill-rakers short, 



13 on lower part of anterior arch. Dorsal XVII. 8 ; spines increasing in length to 



the last, which measures | length of head and \ longest soft rays. Pectoral nearly 



as long as head. Ventral produced into a long filament, extending beyond origin of 



anal. Anal III. 7 ; third spine longest, a little shorter than last dorsal spine. 



•j 22 



Caudal rounded. Caudal peduncle as long as deep. Scales 30 — ; lat. 1. — • 



Uniform pale brown. 



Total length, 120 millim. 



Described from a single specimen from the north end of Lake Tanganyika. 



64. Tropheus moorii. — Blr. 1898. (Fig. p. 109. Lower.) 



Teeth minute, those of the outer series tipped with brown and numbering about 



50. Depth of body zh to 2§ times in total length, length of head 35 to 3^. Snout 



descending in a strong curve, as long as or a little longer than the diameter of the 



eye, which is 3^ to 4 times in length of head, and equals § to f interorbital width ; 



mouth extending to below anterior border of eye ; four series of scales on the cheek ; 



large scales on the opercle. Gill-rakers short, 11 or 12 on lower part of anterior 



arch. Dorsal XXI. 5-6 ; spines increasing in length to the sixth, which measures 



not quite half length of head ; longest soft rays § to J length of head. Pectoral 



as long as head. Ventral produced into a short filament, reaching beyond origin of 



anal. Anal VI. 5-6 ; spines increasing in length to the last, which slightly exceeds 



longest dorsal. Caudal slightly notched. Caudal peduncle as long as deep. Scales 



3 22 — 2 ^ 



^0-^52 — ; lat. 1 . Dark brown ; a lame bluish-white blotch on each side : 



J 12 11— 12 fa 



belly reddish brown ; fins blackish. 



Total length, no millim. 



Described from five specimens from Kinyamkolo. 



The occipital crest is very strong, and the parietal crests are produced on the 

 frontals. The insertion of the ribs is as described in the preceding genera 

 Telmatochromis and Eret modus. 



The mouth and pharynx of one of the specimens contains four eggs of very large 

 size, the vitelline sphere measuring four millimetres in diameter, with an embryo 

 in an advanced stage of development. The egg of the Fifteen-spined Stickleback 

 (Gasterosteus spinachia), hitherto regarded as the largest Teleostean egg in proportion 

 to the size of the animal, measures only three millimetres in diameter. Besides the 

 Siluroids of the genera Arius and Galeichthys, which have very large eggs, at least 

 two species of Tilapia were known to give shelter to their eggs in the manner 

 noticed above — viz., T. simonis Gthr. {Chromis paterfamilias, Lortet), as observed 

 by Professor Lortet in Lake Tiberias, and T. nilotica, Cuv., as noticed by me in a 



