40 Dr. G. Baur on Meiolania. 
frontal, maxillary, palatinum, vomer. The inner process of 
the prefrontal connected with the vomer, the outer with the 
maxillary. In Chitra and Cyclanosteus there is no con- 
nexion between prefrontals and vomer; in Hmyda and 
“Baikiea”? the imner process of the prefrontals becomes 
rudimentary. 
y. Pleurodira. 
The inner process of the prefrontals is absent or rudi- 
mentary, there is never a connexion with the vomer and never 
with the palatines. The outer process is either connected 
with the maxillary alone or may even touch the palatines. 
Podocnemidide.—In Podocnemis and Hrymnochelys (Dume- 
rilia) there is no connexion between the outer process of the 
prefrontals and the palatines. In LHrimnochelys the inner 
process is indicated very much more than in Podocnemis. 
Sternotheride.—Like Podocnemidide, in Sternotherus 
niger the inner process is still more indicated than in 
Erymnochelys. 
Chelydide.—In Chelymys victorie the outer process is 
very near to the palatines, the inner process scarcely present. 
In Chelodina longicollis the ends of the outer process of the 
prefrontals and the palatines meet; the inner process 1s more 
developed, as in Chelymys, but not so much as in Sterno- 
therus. ‘This is called by Mr. Boulenger a “‘ complete bony 
orbito-nasal septum.” 
To sum up. Ln all Cryptodira (if not highly specialized, 
as some Cheloniidee and Dermochelys) the inner process of the 
prefrontals shows a connexion with the palatines and the vomer. 
In all Pleurodira not only the connexion with the pulatines 
but also that with the vomer is absent. 
In all Testudinata in which the inner process of the pre- 
frontals ts connected with the palatines this process is connected 
with the vomer “also. 
Now what do we find in JMeolania. There is a small 
palatonasal opening which is shown on the right side; the 
inner preefrontal process is connected extensively with the 
palatines ; therefore a connexion must also exist with the 
vomer. 
I may add that this region in Mezolania is nearest to the 
condition found in the Testudinide. But according to Mr. 
Boulenger “ Dr. Baur is not justified in saying that the prae- 
frontals are connected with the vomer in Medolania.” 
5. Mr. Boulenger claims to be better informed as to the 
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