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Mr. P. L. Sclater on the Spur-winged Geese. 69 
above referred to, and I must give a new name to the genus, to be 
established on the Tortoise from the Zambesi. 
This genus may be considered in some respects intermediate 
between Cyclanosteus and Emyda; for, though it has the simple 
flexible boneless hinder margin of the dorsal shield of the former 
genus, it has the seven sternal callosities of the latter ; but these cal- 
losities, though they agree in number, are of a much smaller size 
compared with the size of the animal than those of the genus 
Emyda, : 
It is the giant of the group, agreeing in size and development with 
the genera of this family which have the legs exposed, and especially 
with the genera Trionyx and Chitra. 
ASPIDOCHELYsS. 
Head ? Limbs ——? The hinder margin of the dorsal 
disk expanded, flexible, without any bony plates. The sternum 
broad, rounded before and behind, hiding the feet, with very distinct 
moveable flaps over the hinder feet. Sternal callosities 7, the odd 
one behind the oblong anterior pair lunar, transverse, the hinder 
pair large, oblong, only united together on the hinder part of the 
inner margin. 
Hab. Africa. 
AsprpocHELys LivinGsTontt. 
? Cyclanosteus frenatus, Peters, MSS. in Gray, Cat. Shielded 
Reptiles Brit. Mus. p. 64. 
Hab. Mozambique, in tributaries of River Zambesi? (Dr. Living- 
stone). 
The dorsal shield is 22 inches long and 17 inches wide over the 
convexity of the back. 
Furtuer Evipence or tue DisttnctNess oF THE GAMBIAN 
AND Rippey’s Spur-wincep Geese (PLECTROPTERUS GAM- 
BENSIS AND P. Riiprpetyi). By Pari Luriey Scuarer, 
M.A., SecreTARY 10 THE SOCIETY. 
The recent death of the males of the two species of Spur-winged 
Geese (Plectropterus gambensis and P. Riippellii), of which I pointed 
out the external differences at one of last year’s meetings * of the So- 
ciety, has given me the desired opportunity of comparing the trachex 
and skeletons of the two birds, and showing that these afford ample 
corroboration of their specific distinctness. Before proceeding to do 
this, I should remark that the individuals to be compared are both, 
as we know from their dissection, adult males. The specimen of 
P. gambensis is in all probability the older of the two, having been 
living many years in the Society’s Gardens. That of P. Rippellii 
was received from Eastern Africa in June 1858. 
Comparing, first of all, the skulls of these two birds together, we 
see that the frontal protuberance, which in P. gambensis (fig. 1) is 
* See P.Z.S. 1859, p. 131. 
* 
