440 PROF. ST. GEORGE MIVART ON THE 
up of three cartilages fused together. After the first, they are of nearly equal length 
till about the seventeenth, whence they rapidly diminish in length postaxiad. 
The median cartilages are slightly larger than the basal ones, and are twenty-nine in 
number ; but one or two bifurcate distally. They are more equal in length than either 
of the other series, and are longest at the preaxial end, 7. ¢. at about the sixth radial. 
The distal cartilages are far the longest and most unequal (being shorter both pre- 
and postaxially) and far longer medianly than any of the median or basal cartilages. They 
are twenty-nine in number, the twelfth, thirteenth, and fourteenth being the longest. 
Each reposes proximally on the distal end of a median cartilage, except the last but six, 
which seems intercalated between the distal ends of the adjacent median cartilages. 
Tue PectoraL Fin. 
The skeleton of this fin I found to closely resemble that of Carcharias glaucus, as 
represented by Professor Gegenbaur!, except that the metapterygium was more seg- 
mented and the propterygium somewhat larger and more prolonged. 
Tue VENTRAL Fin. 
The order much resembled that of C. glaucus, as shown by the last-named author ?, 
save that there was no thick preaxial radial ; but I found that four slender ones joined the 
pelvic cartilage, while, instead of one stout radial ; three slender ones were appended to 
the distal end of the basal supporting cartilage of the ventral fin. 
LAMNA CORNUBICA. 
Dorsau Fin (Plate LX XIV. fig. 2). 
The skeleton of this fin exhibits much general resemblance in outline to the 
corresponding one of Zygewna malleus ; but the basal cartilages are very much elongated 
at the expense of the median series, which are found only in the postaxial half of 
the fin. 
The basal cartilages are twenty-four in number, and, after the first two, attain at once 
their greatest length, decreasing postaxiad after about the fifteenth. ‘The five most 
postaxial radials are segmented ; but they may have been fractured. 
The median cartilages ave only twelve; and all are very short, and interposed 
between the more postaxial radials of the other two series. 
The distal cartilages ave extremely elongated, and number twenty-three, the eleven 
more preaxial of which repose directly on the distal ends of the basal cartilages, the 
others resting on the short median ones. 
1 Untersuchungen, Heft ii. plate ix. fig. 5. 
2 « Die Gliedmassen der Wirbelthiere im Allgemeinen,” in Jenaische Zeitschrift, vol. xy. plate xy. fig. 9. 
