526 BULLETIN 58, UNITED STATES NATIONAL MUSEUM. 



posterior end of the bony disk in a small tubercle behind which to the 

 end of the carapace there are numerous short raised lines similarly 

 terminated; a couple of rows of blunt tubercles in front of the bony 

 disk on the soft flap behind the overturned nuchal border; plastral 

 bones more or less discernible on underside as well as the callosities, of 

 which there is a pair on the hyo-hypoplastra and one on each of the 

 xipliiplastra. Color (in alcohol) above dark olive slate, underneath 

 drab; head with a few scattered blackish dots and traces of a oculo- 

 supratemporal black line, a subocular and an anterior oculo-labial line ; 

 neck below dusky with indistinct pale spots on throat and traces of a 

 lateral pale band; underside with a few dark blotches, the one filling 

 the outer angle between the hyoplastra and the hypoplastra as well as 

 the median blotch on the xiphiplastra being most conspicuous ; palms 

 and soles dusky. 



Dimensions. 



mm. 



Length of carapace 150 



Greatest width of carapace 120 



Length of plastron 118 



Greatest depth of shell 51 



Greatest width of head 29 



Distance from plastron to tip of tail 48 



Free portion of tail, from connection with carapace 18 



The male of the corresponding age (U.S.N.M. No. 34054) differs 

 mostly in less depth of shell and longer tail. Eight pairs of costal 

 plates can be made out; in addition to the callosities on hyo-h3^po- 

 plastra and xipliiplastra there are indications of rugosities on each 

 arm of the entoplastron. No trace of keel or depression on carapace. 



Hahitat. — It is impossible at the present stage of our knowledge to 

 indicate the precise range of this species in China. It seems to occur 

 in all the southern rivers and in Formosa; but how far north it 

 extends or where it meets the next species must be left to the future 

 to clear up. 



List of specimens of Amyda sinensis. 



a Probably four years old; p. 526. b Probably four years old; description p. 525. 

 AMYDA SCHLEGELII (Brandt). 



1855. Trionyx pcrocellatiis Gray , Cat. Shield Rept. Brit. Mus., pi. xxxi« (China) 



(not of 1844). 

 1857. Trionyx schlegelii Brandt, Mel. Biol. Acad. Sci. St. Petersbourg, II, p. 610 



(type-locality, Peking, China: type Mns. St. Petersb., no. 177; A. Bunge, 



collector). 



o See fig. 406, on p. 522, of this work. 



