144 TESTUDINID &. 
Margin of carapace not reverted nor serrated, in the young as 
well as in the adult; a narrow nuchal shield ; discal shields con- 
centrically grooved ; vertebral shields broader than costals. Plas- 
tron with thick anterior lip, which is truncate or very slightly 
notched anteriorly, and does not project, or projects but slightly, 
beyond the anterior border of the carapace; the length of the 
thickened anterior lip equals about one fifth the length of the 
plastron in the female and one fourth in the male; hind lobe very 
short, truncate or very openly notched, its length half or less than 
half the width of the bridge; the longest median suture is between 
the abdominal shields, which equals twice to four times that between 
the pectorals; the smallest shields are the gulars; inguinal large, 
axillary small. Carapace yellowish or pale olive, uniform or ele- 
gantly marked with black areolar and radiating bands; plastron 
yellow, uniform or with a few radiating black markings on each 
shield. 
Length of shell 19 centim. 
Tropical Africa. 
a. 2, stffd. Gambia. J. Whitfield, Esq. [ P.] 
b. 2, stffd. W. Africa ? Dred ai, Gray Lesie 
(Type.) 
c,d. 3 9, stfid. W. Africa. 
e. 9, shell. W. Africa. 
Ff. G, shell, imperfect. C. Africa. re Speke/P.]. (Type 
f C. spekii.) 
gh. 2 & yg., stfid. Anseba Valley, W. T. Blanford, Esq. 
Abyssinia. (gels 
t. 2, dry. Anseba Valley, W. Jesse, Esq. [C.]. 
Abyssinia. 
k. Yg., spir. z Kilimanjaro. F. J. Jackson, Esq.[ P.]. 
l. 2, shell. Sandom. Sir Samuel Baker | P. }. 
m. 9, stffd. p 
n. 3, skel. —? 
0. 3, spir. ——}? 
18. PYXIS. 
Pyxis, Bell, Tr. Linn. Soc. xv. p. 395 (1827); Wagl. Syst. Amph. 
p: 138 (1830); Gray, Syn. aie D. 16 (1831); Dum. § Brbr. ii. p. 155 
(1835) ; Gray, Cat. Tort. p. 12 (Cee and Sh, Rept. i. p. 14 
(1855); Strauch, Chelon. Stud. p. 23 (1862); Gray, Suppl. Cat. 
Sh, Rept. i. p. 12 (1870). 
Neural plates alternately tetragonal and octagonal; costal plates 
very unequal in size, third, fifth, and seventh pointed distally ; 
supracaudal shield undivided. Plastron extensively united to the 
carapace by suture, with short axillary and inguinal buttresses 
which do not reach the costal plates ; front lobe hinged, movable ; 
entoplastron anterior to the humero-pectoral suture. Skull with 
narrow bony postorbital and temporal arches; alveolar surface 
without median ridge; beak hooked; choane between the eyes. 
