588 
Mr. De la Beche and Mr. Cootbeare on 
more especially is this coincidence visible in the scapula which has 
a narrowed articulating face towards the clavicle, and a broader to- 
wards the humerus. The whole evidence then stands thus : some 
bone having a certain articulating surface waS requisite to com- 
plete, together with the scapula, the glenoidal cavity ; these 
bones exactly possess the requisite form ; they agree exactly 
with the bones holding the same place in the Ichthyosaurus ; and 
there is no other place in the skeleton which they can be supposed 
to have occupied, except perhaps that of ossa ilia, with which 
however they will not be found, on careful examination, at all to 
agree. 
The bones d y d , we have assigned to the office of radius and ulna* 
because their articulating surfaces at the one end agree with those of 
the humerus, and at the other with those of the three which ob- 
viously form the carpal series in the paddle, and because we cannot 
discern any other equally probable place in the arrangement of the 
skeleton. 
Of the paddle, the three first or carpal bones marked e , e y e y are 
well characterised ; of these the central has a form not unlike that 
of the phalanges of reptiles, but more flattened ; and with articu- 
lating extremities, forming a smooth and gentle curve ; the ex- 
terior bones have a general texture like that in the paddle bones of 
the Ichthyosaurus, but have a reniform outline, and are much 
flattened. 
Of the succeeding bones of the paddle, Col. Birch’s specimen 
exhibits two fragments; one (fig. 1, plate 42) exhibiting three 
rows of phalangic bones, to which the description already given of 
the central carpal bone would equally apply, and which (except 
that they are shorter) closely resemble those of the sea turtle, 
mingled with bones exactly resembling the round bones, which 
