484 FISHES CHAP. 
lower lobe of the caudal. The fin-rays which support the 
ventral portion of the caudal fin are more numerous and longer 
than those in relation with the dorsal lobe, and hence at this 
stage the tail is really heterocercal. 
ANG KK WK / 4 
SSAATMUATIM A NAS 
ue : 2 SELMA 
Fig. 281.—Larva of Polypterus senegalus. x 4. Showing its characteristic attitude 
when resting on the bottom of an aquarium, and the large size of the cutaneous 
gills. (From Budgett.) 
In the genus Calamichthys the body is greatly elongate and 
Fel-like in shape. Pelvic fins are absent, and normally there is 
no suboperculum. The dorsal finlets are more isolated than in 
Polypterus, and each spine supports but a single soft ray. Only 
a single species is known, C. calabaricus' (Fig. 282). 
Zeer aes coo 
LEE SS 
CR, 
Car om Sees, 
27) Zi lah 
2 
Fic. 282.—Calamichthys calabaricus. x 2. (From a specimen in the Cambridge 
University Museum. ) 
Calamichthys has a more restricted distribution than Poly- 
pterus, and is confined to certain rivers of West Africa. First 
obtained at Creek Town on the Old Calabar river, it is now 
known to occur in the delta of the Niger, on the coast of 
Cameroon, and as far south as the river Chiloango, frequenting 
the smaller muddy rivers opening into the estuaries.” It is a 
1 Traquair, Journ. Geol. Soc. Ireland (2), 1871, p. 249. 
2 Boulenger, Les Poissons du Bassin du Congo, Bruxelles, 1901, p. 27. 
i" ——- 
