10 
each of the fins, except the caudal, the anterior rays are i^ently arclied ; and 
althongh distinct small fulcra can rarely he discerned, various indications 
prove the original presence of these structures. The pectoral fins arc large 
and triangular, perhajis almost falcate; and the pelvic fins, of ahout half the 
size, exhibit a relatively long liase-line, and are placed midway between the 
pectorals and the anal. The dorsal fin (PI. II, Pig. 4<) shows in front at least 
nine large basal fulcral rays, gradually increasing in length, and its base-line 
is greater than its height. The anal fin is slightly smaller than the latter, 
hut equally elevated ; and in the original of PI. II, Pig. 3, a few of the 
small anterior fulcra can 1)C distinguished. The caudal fin is deeply cleft, 
and the rays of the loAver lobe are very closely articulated even near the 
proximal extremity. 
Squamation . — The scales are extremely small, those of the flank, in an 
individual 0‘T35 in lengtli, not measuring more than 0'0015 in depth and 
hreadtli. Ventrally, they hecomc narrow, and upon the U 2 :>per lobe of the 
tail oat-shaped or diamond-shaped ; and Sir Pliilip Egerton describes them 
as externally sculj)tured by “two or three deep longitudinal sulci.” The 
present specimens, however, are too imperfectly preserved to exhibit any 
scale ornament, except faint striations upon the investment of the upper 
caudal lobe ; and the only ridge-scales to he observed occur upon the sujjerior 
border of this prolongation, where they are very prominent, and pass 
upwards into the fin-fulcra. 
Myriolepis rates, sq). nov. 
PI. Ill, Figs. 2, 3. 
Ohs . — A second species of Myriolepis is indicated by a small series of 
sj)ecimens, of which the following three are the most imj)ortant : — 
{a) The complete head and trunk, wanting all fins, except the anal 
and caudal, to he regarded as the type-specimen, and shown 
slightly reduced in IT. Ill, Eig. 2. 
{h) The greater portion of the head and trunk, lateral aspect, 
with fragments of the pectoral, pelvic, and anal fins, the former 
in the relative positions indicated in dotted outline in the 
figure of No. a. 
{c) Portion of the head and anterior portion of the trunk, showing 
the left infraclavicle, outer aspect. (IT. Ill, Eig. 3.) 
