230 -Mr. II. G. Seeley on Chelonian Remains 



have formed part of the same individual turtle a.<i the skull 

 (t. ix.) " on which I now offer a few notes. 



r>ack view of the skull of Chehne harricemis (AYoodward), half uat. size, 

 showing the large liyoid bones in shade ; between them is seen the 

 tripartite occipital condyle, with the conical foramen magnum above 

 it, and laterally the outlines of the other occipital bones. 



Chelone planimentum (Owen), Proc. Geol. See. 

 PaljBont. Soc. 1849, pi. ix. 



This skull has been veiy incon-ectly figm-ed and imperfectly 

 described. 



It is wide behind the orbits, but in front of them tapers 

 more abruptly from side to side and from above downward than 

 shown in the iigiu-e, somewhat resembling Chelone caouanna. 



The nostril is subquadrate, broader than high, about -|-|- of 

 an inch wide, and small for the size of the skull when com- 

 ])ared with recent marine Chelonians. The premaxillary is a 

 little Avorn; but the extreme length of the skull from the pre- 

 maxillary to the occij)ital condyle is o inclies ; the antero- 

 posterior length to the termination of the siipraoccipital crest is 

 Q\ inches. The maxillary bones look outward, forward, and 

 u})ward, in this latter character differing from those of the 

 recent marine Chclonia. 



The orbits are subcircular, rather less than !§ inch in dia- 

 meter ; they look outward and forward and a little upward; 

 and the prefrontal bones which scj)arate them superiorly are 

 little more than an inch wide. At the posterior margin of the 

 orbits the skull is ?,\ inches wide ; from the front of the 



