16,2 Taylor: Philippine Turtles 125 
Measurements of Cyclemys amboinensis {Daudin). 
mm. 
Total length, head extended 
238 
Total length of carapace 
158 
Greatest width of carapace 
110 
Height of body 
70 
Length of plastron 
150 
Width of plastron 
78 
Length of posterior lobe 
84 
Length of anterior lobe 
65 
Length of tail, behind anus 
20 
Length of head 
38 
Width of head 
24 
Variations . — In the Bureau of Science collection there are three 
other adult specimens from Polillo and five young ones. The 
adults all agree in the smoothness of the carapace; in two (Nos. 
1463 and 1464) the trace of the dorsal keel is almost effaced, 
and the anal shields are fused into a single large shield. In 
the specimen described they are only partially fused. In the 
fourth specimen (No. 1462) the two plates are distinct. This 
specimen has a broad regular depression along the middle of the 
plastron, while in the other three the plastrons are gently convex. 
A specimen (No. 1475) from Laguna Province, Luzon, exhibits 
a partial fusion of the anal shields and only a dim trace of the 
dorsal keel. The amount of black on the plastron varies con- 
siderably. In certain specimens the black' almost covers the 
entire plastron ; in others it is almost wanting. 
Young . — The young differ rather markedly from the adults. 
A very strong, blunt keel from nuchal plate to end of last ver- 
tebra; vertebral shields distinctly wider than long, very nearly 
as wide as costals; two fine distinct keels passing along upper 
half of costals; marginals very much broader proportionally 
than in the adult ; carapace very finely sculptured ; plastron with 
a distinct, transverse depression across hinge ; anal plates distinct, 
suture of abdominal plate with the marginals larger than that 
of pectoral with the marginals. Carapace uniform dark brown ^ 
dark color on plastron forming a single continuous figure and 
not reaching outer edge of scutes ; dark areas at union of plastron 
with marginals, and dark spots on underside of marginals. 
There are two other adult specimens in the Bureau of Science 
collection. In a living specimen in the Bureau of Science 
aquarium the carapace retains the three keels; the shields are 
roughly sculptured on the upper posterior parts and the con- 
centric growth lines are very distinct, with a few, slight, radiating 
ridges. The posterior edge of the carapace is distinctly serrate 
