46 CASE. [Vou. XIV. 
Riitimeyer) is in favor of the presence of fontanelles in the 
carapace. 
He found difficulty in explaining, on Dr. Baur’s hypothesis, 
how the plastral bones could still be present in Dermochelys, 
and separate from the external layer of dermal ossifications. He 
considered the dermal ossifications of Ostracion, Polacanthus,and 
Glyptodon to be of the same origin as those in Dermochelys and 
that no one would imagine that they came from the ribs. 
He saw no relation between the bones of the skull in the 
two families. The shape of the pterygoids and the posterior 
nares located far forward militated against the idea of aquatic 
adaptation. 
He showed that the series formed by Baur on the possession 
of claws was inaccurate, that Evetmochelys had two claws, and 
that the genus was formed for the reception of forms with two 
claws. 
He regarded the plastron of Dermochelys as likely to be as 
much primitive as reduced. 
The nuchal plate might be a more ancient form than the 
other peripherals, and have its origin in the necessity for a 
strong attachment for the neck muscles. 
The articular faces of the cervical vertebrae he considered 
to be too variable to afford safe evidence of affinity. 
He questioned the presence of peripherals in Protostega, and 
supposed that the peculiarity of the anterior rib was not neces- 
sarily related to the possession of the carapace, but might have 
been derived from ancestral forms. 
In the same year as Dollo’s latest paper appeared one by 
Boulenger (13), in which he said: “For my part I have to say 
that the statement that Dermochelys differs from the Chelonzidae 
only in the configuration and isolation of the carapace is simply 
monstrous. ... 
“‘He[Dr. Baur] actually states the head and limbs are funda- 
mentally the same in Dermochelys and in the Chelontzdae. The 
skull of the former bears a general resemblance to that of the 
true turtles; but this is limited to the shape, and, to a certain 
extent, the general constitution of the temporal roof; in the 
absence of the column-like processes of the parietals, descend- 
