British Upper-Jurassic F ish-remains. 399 
far as the present writer is aware, however, only a single 
specimen of Caturus from Garsington exists; and as this 
exhibits the two special features noted by Agassiz, while 
wanting the head on which he would assuredly have remarked 
had it been present, it may be regarded with tolerable certainty 
as the type specimen on which C. angustus was intended to 
be founded. ‘The fossil in question is in the museum of the 
Victoria Institute, Worcester, and bears an old label as 
follows, the specific name being apparently in the late Sir 
Philp Egerton’s handwriting :—“ Caturus angustus. Oolite, 
Garzington Hill, Oxon. From Revd. W. Parker.” The 
present writer is indebted to the courtesy of the Museum 
Committee and of the Curator, Mr. Samuel Smith, for the 
opportunity of studying the specimen and of publishing the 
following description. 
The head, with the anterior portion of the abdominal region, 
is wanting, but the remainder of the fish is well-preserved, as 
shown in Pl. XVIII. fig. 1, which is one half the natural 
size. ‘he trunk is remarkably elongated, hence the specific 
name; and the caudal fin is especially large. The notochord, 
as usual, must have been persistent, and there are no indica- 
tions of ossifications in its sheath. The ribs and neural 
spines in the abdominal region are comparatively slender ; 
the neural and hemal arches in the caudal region are stout, 
the pedicles being much expanded and the spines becoming 
rapidly shortened in the narrow portion behind the origin of 
the anal fin, where they are deeply imbricating. The 
pectoral fins are, of course, wanting; but all the others 
display a conspicuous fringe of fulcra on their anterior border. 
The fin-rays, though unjointed for some extent proximally, 
exhibit numerous articulations and bifurcations in their distal 
halt or two thirds; and the distance between the successive 
articulations is usually much greater than the width of the 
ray or branch on which they occur. ‘lhe pelvie fins arise 
opposite the origin of the dorsal fin, and are about equal in 
size to the anal; the anterior ray bearing the fulera is espe- 
cially robust. ‘There are indications of a series of aborted 
fin-supports in advance of the dorsal, and this fin is about as 
long as deep, comprising not less than eighteen or twenty rays ; 
there are two short rays in advance of the longest, of which 
the length appears to be nearly equal to the depth of the 
trunk at its insertion. ‘The anal fin arises midway between 
the pelvic pair and the caudal, is deeper than long, and about 
two thirds as large as the dorsal fin; the number of rays 
cannot be satisfactorily counted, but there must have been at 
least twelve. ‘The large caudal fin arises from a much con- 
