a new Fossil Animal . 
589 
form the external series in the paddle of the Ichthyosaurus. The 
other specimen (fig. 2) exhibits these phalangic bones in a longn 
tudinal series, containing traces of at least eleven rows counting 
lengthwise. From these specimens we may draw the following 
conclusions : 
1st. That the series of small bones forming the paddle was very 
numerous, approaching in this respect to the structure of the 
analogous part of the Ichthyosaurus ; and secondly, that there were 
a series of round bones like those which form the external bones of 
the Ichthyosaurian paddle, and probably holding a like place ; for 
some of those in fig. 1 have a lateral situation (which would be 
required in this conformation). 
Thus, therefore, a general similiarity of organisation between 
this important member in the Plesiosaurus and Ichthyosaurus 
appears to be established. On the other hand, a comparison with 
the paddles of the sea turtle will exhibit such fresh analogies as to 
indicate that in respect of the various forms of animal extremities, 
the Plesiosaurus holds as it were a middle place between it and the 
Ichthyosaurus ; for we may remark in the first carpal series of the 
turtle three bones not unlike those of the Plesiosaurus ; these are 
succeeded by two rows exactly corresponding, as we have before 
observed, to those holding a similar place in the Ichthyosaurus. 
The corresponding bones in the Plesiosaurus we have not yet seen 
(unless indeed those of a rounded form not placed laterally, and 
therefore forming the exterior series, but at the end of fig. 1, 
may be accounted such) ; but the double analogies above stated 
scarcely leave a doubt that they likewise had a similar form. The 
succeeding and phalangic series in the turtle exactly agree with 
those of the Plesiosaurus in form, excepting that they are in- 
dividually longer, and, as in quadrupeds, exhibit only a few joints, 
