138 Philippine Journal of Science 1920 
Measurements of Chelonia japonica (Thunberg). 
mm. 
Total length 735 
Length of carapace 555 
Width of carapace 470 
Height of carapace 180 
Length of plastron 448 
Width of plastron, across pectoral 290 
Length of head 125 
Width of head 90 
Depth of head 100 
Tail, behind anus 28 
Variations.—The head shields of this species are subject to 
more or less variation. In a second specimen living in the 
aquarium there is a second pair of prefrontals bordering the 
nasal area but not touching the beak. These shields are small 
and irregular. 
Remarks.—The species is common in the Philippine Islands. 
Specimens have been kept alive in the aquarium. They are very 
frequently taken in Manila Bay. They are fed on fish. 
Suborder CHILOT 42 
Chilote WIEGMANN, Handb. Zool. (1882) 167. 
This suborder consists of one family. 
TRIONYCHIDAD 
Trionychidz BELL, Zool. Journ. 3 (1828) 515. 
Carapace and plastron without outer scales or shields and not 
entirely ossified, covered with leathery skin; head completely 
retractile; no external ear; bony part of jaws concealed under 
thick lips; three digits with claws; nostrils at end of a flexible 
proboscis. 
Only a single genus of this family is positively known from 
the Philippine Islands. Species of three other genera have bee? 
reported but probably erroneously. They are the following: 
Dogania subplana (Geoffroy Saint Hilaire.) Reported by Casto de 
Elera™ as T [rionyx] subplanus, from Mindanao and Palawam, 
with specimens in the Santo Tomd4s Museum and in turn listed 
from the Philippines by Siebenrock * and de Rooij,™ on the strength 
of Casto de Elera’s record. No specimen is now in the Santo 
Tomas Museum. : 
Chitra indica Gray. This species was first reported from the Phil 
ippine Islands by Gray, who later made the specimen the type 
“Cat. Fauna Filipinas 1 (1895) 407. 
* Zool. Jahrb. Suppl. 10 (1909) 606. 
_™ Rept. Indo-Aust. Arch. 1 (1915) 326. 
