Mr. A. 8S. Woodward—Palwichthyological Notes. 283 
from Diplodus in the Keuper of Somersetshire (D. Mooret, 
A. 8. Woodw.*). It is now of much interest to be able to 
add possible evidence of the survival of another ancient type 
in the form of true Cladodont teeth from Warwickshire. 
All the kuown examples of these teeth are very small, a 
series of four being shown of twice the natural size in Pl. X. 
fig. 2. The crown (fig. 4) consists of three robust conical 
cusps, vertically striated except towards the apex, and about 
equal in width at the base; the median cusp is nearly vertical 
and slightly shorter than the outer pair, which incline a little 
outwards and are almost symmetrical. The root, as shown 
from above (fig. 3), is horizontally expanded, straight at its 
outer border, where the coronal cusps arise, bounded by asemi- 
circular border within. When the teeth are in series (fig. 2) 
the expanded roots overlap, as in Diplodus, the Cladodonts, 
and the modern Chlamydoselache, there being evidently 
several teeth in function simultaneously in each transverse 
row. ‘There appears to be no smooth articular facette on the 
root. 
As in the case of the Diplodont teeth, the new specimens 
are of course insufficient to prove the survival of an ancient 
Paleozoic genus of sharks in the Trias; they merely suggest 
that some of the Cladodonts were still to be met with in early 
Mesozoic seas. ‘The form of the teeth, however, differs in no 
essential respect from the Middle Devonian and Lower 
Carboniferous type named Phabodus in America}, the most 
important differences apparently being the complete suppres- 
sion of intermediate denticles and the absence of an articular 
facette on the root in the Triassic specimens. It is therefore 
proposed to assign to the teeth now described the provisional 
name ot Phabodus Brodiet. 
form. and Loc. Upper Keuper, Shrewley, Warwickshire. 
A Hybodont Fin-spine. (Pl. X. figs. 5, 5.) 
It has already been pointed out that the Triassic Hybodont 
fin-spines described by Agassiz under the name of Leiacanthus 
are provided with small posterior denticles. No good figure 
of an unabraded specimen has, however, hitherto been pub- 
lished, and a drawing of the finest example of the so-called 
Hybodus keuperinus in Mr. Brodie’s collection is therefore 
appended (fig. 5). ‘This spine, like those from the Muschel- 
kalk, is much lateraliy compressed, with a sharp anterior 
border ; the lateral ribbings are fine and numerous, and the 
* Ann. & Mag, Nat. Hist. [6] vol. iii. p. 299, pl. xiv. figs. 4, 5 (1889). * 
+ St. John and Worthen, Paleeont. [linois, vol. vi. p- 251 (1875). 
