176 
ACTINOPTERYGir. 
ridged but apparently unornamented. On the ventral 
border of the caudal region each scute bears a well- 
developed, posteriorly-directed uncinate spine ; and nearly 
the whole series here is exposed in side view. Scutes of 
this kind are similarly observed in the fragmentary type 
specimen described by Pictet. The scutes of the flanks 
are smaller and more delicate, but not clearly shown. 
Near the dorsal border of the anterior abdominal region 
some of these occur in a regular series, apparently pierced 
by the slime-canal of the lateral line, and having the 
anteriorly-directed pierced ray very large in comparison 
with the others. Somewhat larger scutes of the same 
form appear again in series below the vertebral column in 
the neighbourhood of the pelvic fins ; and others seem to 
be crushed upon the transverse processes of the vertebrae in 
the same region. Eemains of lath-shaped plates on the 
flank are also distinguishable on the anterior half of the 
caudal region. Lewis Coll. 
49536. A larger fish, wanting the greater part of the head but 
displaying the dorsal fin, noticed by Davis, loc. cit. p. 620; 
Sahel Alma. About 70 vertebrae can be distinguished, 
and those in the hinder part of the abdominal region 
exhibit the usual very large transverse processes, from the 
extremities of which very slender and nearly straight ribs 
are suspended. The remains of the paired fins are too 
fragmentary for description ; but the pelvic pair seems to 
be in its natural position, arising just behind a point 
opposite the origin of the dorsal, and its rays are shown 
to be finely divided distall}^ The dorsal fin occupies 
nearly the middle third of the back, ihe distance between 
its origin and the occiput about equalling that between 
its termination and the caudal fin. All its rays are 
simple in the proximal half, but articulated at wide 
intervals and subdivided in the distal half. The foremost 
two or three rays are shown only in impression, but the 
others are well-preserved, and the total number seems to 
have been about thirty-five. About twelve of the hinder- 
most rays are much more delicate and shorter than the 
others. The anal fin is wanting, but the caudal fin is 
preserved, showing the cluster of basal scales above and 
the distant articulations of its rays. The dorsal and 
ventral marginal scutes are preserved, but nearly all are 
