230 



Mr. H. G. Seeley on Chelonian Remains 



have formed part of the same individual turtle as the skull 

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



]?ack view of the skull of Chelone hamcensis (Woodward), half uat. size, 

 showing the large hyoid 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 jjlammentum (Owen), Proc. Geol. Soc. 

 PaljBont. Soc. 1849, pi. ix. 



This skull has been very incorrectly figured 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 figure, somewhat resembling Chelone caouanna. 



The nostril is subquadrate, broader than high, about -j-f of 

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

 pared with recent marine Chelonians. The premaxillary is a 

 little worn; but the extreme length of the skuU from the pre- 

 maxillary to the occipital condyle is 5 inches ; the antero- 

 posterior length to the termination of the supraoccipital crest is 

 6^ inches. The maxillary bones look outward, forward, and 

 upward, in this latter character differing from those of the 

 recent marine Chelonia. 



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

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

 and the prefrontal bones which separate them superiorly are 

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

 orbits the skull is 3i inches wide : from the front of the 



