CESTRACIOXTIDIE. 
285 
approximated in front. Of series n., the teeth measure 
0 025, and still show faint traces of lateral denticles, while 
considerably raised and broadened mesially. Of series hi., 
the teeth nearly equal those of series it. 1 in length, the 
former measuring 0*037 and the latter 0*04; they are 
also considerably raised mesially. Of series v., only two 
imperfect teeth are preserved, slightly shorter (0-035), les 3 
elevated, and narrower than those of series iv. 
Enniskillen Coll. 
P. 2142. Group of eighteen teeth, associated with fragments of car- 
tilage and shagreen, and partly displaced ; one aspect 
figured, of the natural size, in PI. XIII. fig. 4. The teeth 
of series ii. measure 0-018 in length ; those of hi. about 
0-026; those of iv. and v., 0-035 and 0-038 respectively ; 
and those of series vi. 0-032. Some of the teeth of series 
iv. and v. exhibit a constriction at each end of the much 
broadened central portion ; and those of series vi. are 
notabl} nanow. Egerton Coll. 
20573. Group of twenty teeth, nearly perfect, in natural order; 
eston, near Bath. Series ii. to v. are represented, and, 
though slightly larger, the relative proportions of the suc¬ 
cessive rows are very similar to those of Xo. P. 2142. 
Johnson Coll. 
35054. Group of about sixty naturally associated teeth, of nearly 
similar proportions to those of Xo. P. 2736. The anterior 
teeth exhibit the slight indications of lateral denticles. 
Purchased , 1860. 
P. 2738. About seventy-five teeth embedded in hard matrix, partly 
scattered and partly in natural order, indicating a’ denti¬ 
tion of very similar proportions to the preceding, but 
remarkable for the breadth of all the teeth. 
Enniskillen Coll. 
P. 2140, P. 2/43. Group of comparatively broad teeth, much broken. 
Egerton $ Enniskillen Colls. 
P. 2737, P. 2739. Two specimens, figured, of the natural size, in 
PI. XIY. figs. 1, 2, displaying the complete dentition of 
one ramus of the jaw. They may possibly pertain to the 
same jaw, though they cannot have been found naturally 
apposed, as shown by the form of the matrix. Eight 
1 The tooth marked a in the figure is evidently misplaced, 
