182 
ACTIXOPTERTGIT. 
The very slender scutes are shown to extend forwards as 
far as the pectoral arch. Lewis Coll. 
P. 4738. Another fine hut contorted specimen 0’31 in length; Sahel 
Alma. The slender pointed premaxillae are shown ex¬ 
tending forwards beyond the cranial rostrum. The long 
transverse processes of the vertebrae in the hinder 
abdominal region are shown in impression ; the expanded 
pelvic fin-supports are also preserved. The very narrow 
ventral scutes of the anterior abdominal region are shown 
to pass rapidly into much larger scutes with widely- 
spreading lateral branches towards the base of the pelvic 
fins, and these continue for some distance beyond. Some 
of the marginal scutes of the hinder caudal region are 
very clearly produced into the lath-shaped plates of the 
flank. Lewis Coll. 
48085. A larger contorted specimen more imperfect, wanting the 
hinder half of the caudal region ; Sahel Alma. The pelvic 
fin-rays are shown to be remarkably long, closely articu¬ 
lated and subdivided at the distal end. The dorsal fin is 
evidently much extended, but its rays are depressed and 
cannot be counted. Leiuis Coll. 
49522. Remains of two specimens on one slab, with Pronotacantlms 
saJiel-almce ; Sahel Alma. The more contorted specimen 
exhibits the double series of dorsal scutes on the anterior 
part of the caudal region, and there are remains of the 
dorsal fin extending between them. The characteristic 
transverse processes are also observed in the hinder half 
of the abdominal region. * Lewis Coll. 
49539. Contorted small fish ; Sahel Alma. Lewis Coll. 
48087. Another small specimen in counterpart; Sahel Alma. The 
double series of dorsal and ventral scutes are well shown 
on the caudal region. The anal fin arises somewhat 
nearer to the caudal than to the pelvic fins and comprises 
at least eight rays. The dorsal fin is showm, but its rays 
are depressed and cannot be counted. Lewis Coll. 
47360. Anterior portion of two small fishes crossing each other on 
one slab; Sahel Alma. The fragment without head is 
interesting as showing in the anterior abdominal region a 
series of narrow heart-shaped scutes of the flank, in 
addition to the dorsal and ventral series. Lewis Coll. 
