720 DR. J. E. GRAY ON THE GENUS BARTLETTIA. [Nov I, 
by a central longitudinal groove into two ridges; the central notch 
not produced forward. (Gray, Cat. Sh. Rept. tab. 37. f. 1.) 
The young animal is black, the head ornamented with large white 
spots. 
P. expansa, Gray, Suppl. Cat. Sh. Rept. p. 83. B.M. 
4, BaRTLETTIA, 2 *<*° /pecued 
Head short and broad; alveolar surface of the upper jaw flat 
in front, shelving and concave behind, with a very indistinct, short, 
subcentral ridge parallel to the outer margin; alveolar surface of 
the lower jaw with a slightly raised ridge on the outer edge, narrow, 
slightly concave in front, the inner edge obliquely raised into a sharp 
ridge, which is wide behind and narrow in front, with a rounded 
depression in the centre of the hinder edge (fig. 1). The central 
ridge in the horny beak of the upper jaw more distinct than in the 
skull. 
The skull (fig. 2, p. 721) is short and depressed, the eyes sepa- 
rated, forehead convex; the head covered with hard shields, the 
crown-shield rounded in front, temporal shields large; chin with 
a single central beard ; the cheek-shield covering part of the tem- 
poral muscle not covered by the bone. The animal olive, and the 
head not spotted. 
Fig. I. 

Lower jaw of Bartlettia pitipii. 
BARTLETTIA PITIPII. B.M. 
Shell olive-brown, ovate, hinder margin greatly expanded; the 
head olive above, rather paler below ; the second and third vertebral 
