44 mokmykim:* 



List of specimens examined : — 



5 Lower Nile.— Ruppell, 1833. 



5 Rosetta branch of Nile, downstream side of Barrage. — Loat, 28.7.99. 



3 Nile near Cairo.— Capt. Flower, 19.8.04. 



1 Lamm, Fayum. — Loat, 5.10.99. 



5 Between Assiut and Abu Tig. — Loat, 1.12.99. 



102 At a regulator near Luxor.— Loat, 8.10.00-12.11.00. 



16 Between Luxor and Assuan. — Loat, 9-10.00. 



1 Assuan.— Loat, 2.10.00. 



2 Lake No, White Nile.— Loat, 22.2.01. 

 2 Gondokoro.— Loat, 8.2.02. 



Called " Anooma" by the Cairo fishermen, according to Capt. Flower, who observes 

 that this little fish seems to bear captivity well. 



Many specimens have been kept in the Gezira aquarium. " They spend most of 

 their time suspended in mid-water, with all their fins and tail in perpetual motion, but 

 occasionally for a short time they will lie on the bottom of the tank with fins 

 motionless. They feed on finely chopped-up earth-worms." 



3. MARCUSEN1US HARRINGTONI. 



(Plate IX. fig. 3.) 



Boulenger, Ann. & Mag. N. H. (7) xv. 1905, p. 457. 



Body strongly compressed, its depth three and four-fifths times in the total length; 

 length of head five and one-third times in the total length. Head as long as deep, 

 once and two-thirds as long as broad ; snout rounded, two-sevenths the length of the 

 head, projecting beyond the mouth ; mouth situated below the nostrils, its width 

 four times in the length of the head; teeth small, bicuspid, 5 in the upper jaw, 

 6 in the lower ; anterior nostril on a line with the lower border of the eye, posterior 

 nostril a little lower down ; the distance between the anterior nostril and the end of 

 the snout equals that between the posterior nostril and the eye and exceeds the distance 

 between the two nostrils ; eye moderate, its diameter three-fifths the length of the snout 

 and half the interocular width. Dorsal fin with 31 rays, its origin corresponding to 

 that of the anal, its length nearly two-thirds its distance from the head ; anterior rays 

 longest, two-thirds the length of the head. Anal fin with 33 rays, equally distant from 

 the base of the ventral and from that of the caudal ; the anterior rays forming a rounded 

 lobe (male). Pectoral fin pointed, a little shorter than the head, not quite twice as long 

 as the ventral, and extending beyond the root of the latter. Caudal fin densely scaled 

 on more than half of its surface, with pointed lobes. Caudal peduncle three and a 



