152 TESTUDINIDZ. 
II. Carapace elongate, margin not at all 
reverted, dark brown or black, each 
dorsal shield yellowish in the centre ; 
nuchal shield absent; gular shields 
distinct, mot produced... 2. von... s% 4, tabulata, p. 157. 
III. Heel with particularly large, conical, spur-like bony tubercles ; 
suture between the anal shields considerably shorter than 
that between the abdominals; carapace of adult uniform or 
closely spotted with black. 
A. Nuchal shield present; supracaudal 
shields GW: grees. <n sone + 5. emys, p. 158. 
B. Nuchal absent; supracaudal single. 
1, Carapace flattened on the vertebral region. 
Lateral marginals about as long as deep, 
forming an angle; pectoral shields very 
narrow in the middle and widening 
gradually towards the sides .......... 6. argentina, p. 159. 
Lateral marginals much deeper than long, 
descending almost vertically ; pectoral 
shields very narrow, widening abruptly 
towards the axillary notch............ 7. calcarata, p. 159. 
2. Carapace very convex, spotted with 
black ; nuchal margin with a very 
strong angular notch.......... 8. pardalis, p. 160. 
TY. Carapace very convex, black with yellow lines radiating from 
the areole, or yellow or brownish with black radiating lines. 
A. No nuchal shield. 
Heel and hinder side of thighs with spur- 
like tubercles ; plastron with dark radiat- 
dn OF TMES 2. cos crags Bisbee a tcus ie ae ese Moke eos ees 9. elegans, p. 161. 
Heel and hinder side of thighs without spur- 
hke tubercles ; plastron without radiating 
VRS J eutied cee aces ROC er 10. platynota, p. 162. 
B. Nuchal shield present. 
1. Upper head-shields small and irregular. 
a. No subconical tubercle on the hinder side of the thigh. 
Nuchalvery narrow, elongate; beak strongly 
nooked, 5. 58 «sence chose ete 11. geometrica, p. 162. 
Nuchal rather large, widening posteriorly ; 
lateral marginals forming an angle with 
the costals ; beak feebly hooked ..... 12. verreauxt, p. 163. 
