16 ME. G. A. BOULENGEB, ON A COLLECTION 



especially below the lateral lines, 78 ^ ; lat. 1. ^ ; the upper extending from the opercle 

 to the caudal, the lower from below the last dorsal spines to the caudal. Pale bluish 

 green, iridescent above, white below ; dorsal and anal bluish grey ; ventrals and caudal 

 yellowish ; pectorals yellow ; two dark streaks on the dorsal. 



Total length 275 millim. 



A single specimen from Kinyamkolo, taken at a depth of 400 feet. The specimen 

 is a female with ripe ova ; these are of large size, measuring 3 J millim. in diameter. 

 The stomach contains a small, partially-digested fish of the genus Paratilapia, as 

 first ascertained by a sciagraph kindly prepared by Messrs. Gardiner and Green, 

 which has enabled me to compare the structure of the vertebral column with that of 

 other members of the family Cichlidce. The insertion of the ribs is typical, viz., 

 sessile, except on the last three prsecaudal vertebrae ; the transverse processes are short 

 and in front of the ribs. The number of vertebra? agrees with that of the more elongate 

 species of Paratilapia. 



Eketmodus, g. n. 



Body moderately elongate ; scales ctenoid. Jaws with rather large spalulate teeth 

 with truncated crowns disposed in oblique transverse rows of two or three. Lips much 

 developed ; maxillary entirely concealed when the mouth is closed. Dorsal with 

 23 to 25 spines ; soft rays reduced to 3 to 5 ; anal with 3 spines. Vertebrae 30 

 (15 + 15). 



A strongly aberrant form, remarkable for its dentition and the structure of the dorsal, 

 formed almost entirely of spines. 



17. Eretmodus cyanostictus, sp. n. (Plate III. fig. 5.) 



8 or 10 transverse series of teeth in each jaw, the crowns reddish brown. Depth of 

 body equal to length of head, 3 times in total length. Profile of snout curved ; length 

 of snout 1J to twice diameter of eye, which is 4j$ to 5 times in length of head, and 

 a little less than interorbital width ; mouth extending to below nostril ; cheeks and 

 opercles naked. Gill-rakers short, 9 or 10 on lower part of anterior arch. Dorsal 

 XXIII-XXV 3-5; spines subequal from the sixth, ^ length of head, a little shorter 

 than soft rays. Pectoral f length of head. Ventral reaching vent. Anal III 6-7 ; 

 third spine longest, a little longer than dorsals; soft rays about § length of head. 



Caudal rounded. Caudal peduncle deeper than long. Scales 32-35 yj^ I lat. 1. -g^-- 

 Blackish brown, with scattered pale blue dots; belly yellowish. 



Total length 75 millim. 



Five specimens from Mbity Rocks, and three from Kinyamkolo. 



The toothed portions of the praemaxillary and mandible are much developed in depth, 

 in a manner suggestive of the Sparidce and Scaridce, and the teeth are implanted in 

 sockets. The deep triangular groove for the reception of the prsemaxillaries extends 



