.BY J. DOUGLAS OGILB). 11k 
species these are few in number, two or at most three having 
been recognised. Two of these which have been unhesi- 
tatingly referred to the genus Chelydra* belong to the Tertiary 
formations of Central Europe, while the third,f about the 
authenticity of which there is some doubt, the plastron 
being still unknown, comes from the Tertiary of Washington 
Territory. 
Genus IJ. DEvisra, gen. nov. 
Orbit lateral. No supramarginal shields. Tail with 
irregular shields of variable size inferiorly.f (Named _ for 
Charles Walter de Vis, Director of the Queensland Museum, 
and author of many valuable papers on Australian zoology 
and paleontology.) 
New Guinea; ? Queensland. 
2. DEVISIA MYTHODES, sp. nov.§ 
THE NEw GUINEA SNAPPING TURTLE. 
Head large and triangular, depressed, with two pair of 
parietal ridges, the inner pair converging and uniting to form 
a prominent point in the middle of the posterior border of 
the occiput ; the outer pair parallel, each terminating in a point, 
which is situated further back than the mesial point. Diameter 
of orbit equal to the length of the snout and to the width of 
the concave interorbital space, and two thirds of the length of 
the mandibular symphysis. Nostrils small and _ circular, 
pierced in a single depressed vertical plate, which is wider than 
deep, is bordered on the sides and below by the maxillary 
sheath, and above by two small supranasal shields ; a pair of 
large preoculars meeting on the median line, as also do the 
*Chelydra murchisoni : Miocene Rocks of Baden, and Chelydra 
argidiarum, Laube, Abhand]. Verein. Totos, ii. 1900, p. 47, pl. ii. fig. 7. 
Brown Coal of Bavaria. 
+ Acherontemys heckmant, Hay, Proc. U.is. Nat. Mus., xxii. 1899, p. 238, 
pl. vi. Miocene of Washington Territory. 
tOwing to the taxidermist having opened the lower surface instead 
of one of the sides of the tail when mounting the specimen, it is difficult 
to see the exact arrangement of the lepidosis, but to all appearance it is as 
described above. In any case it approaches in this character nearer to 
Macroclemys than to Chelydra, between which it appears to form a con- 
necting !ink, possessing characters otherwise confined to one or the other 
genus. 
§The species is remarkable as being the on!y cryptodirous tortoise as 
yet discovered in the Australasian region. 
