530 BULLETIN 58^ UNITED STATES NATIONAL MUSEUM. 



margin of dorsal shield thickened, not tuberculated; posterior margin 

 of sternal shield [plastron] short, semilunar, rounded. 



Dimensions. — Length of carapace, 353 mm; greatest width, 306 mm. 



Habitat. — Found in the southern tributaries of the Amur River, 

 especially in the Sungari and Ussuri rivers, as well as in the Amur 

 River itself between the mouths of the tributaries mentioned. 



According to Nikolski there are in the St. Petersburg Museum 

 specimens from the above rivers and also from Lake Khanka. 

 Whether the specimen from Korea (No. 9447) belongs to this form 

 it is impossible to say. 



[Genus DOGANIAa (Gray).] 



1836. Amyda Bonaparte, Chelon. Tab. Anal., p. 8 (type, Trionyx subplanus) 



(nut of Oken, 1816.) 

 1844. Dogania Gray, Cat. Tortois. Brit. Mus., p. 49 (type, Trionyx subplanus). 

 1869. Sarbieria Gray, Proc. Zool. Soc. London, 1869 (p. 200) (type, Trionyx fre- 

 natus). 



The genus Dogania differs from Amyda in having all the pleuralia 

 separated by the neuralia, while in Amyda the last pair of pleuralia 

 are in contact behind the neuralia. Doctor Siebenrock has recently 

 shown^ that D. suhplana is unique in lacking the median process of 

 tlie hypoplastron. The head is also comparatively much larger and 

 the body much more depressed, the body being almost concave with 

 no median keel. 



The occurence of Dogania suhplana — or a related species — in For- 

 mosa is very problematical. I can not find that an}^ specimens have 

 been examined and the only foundation for the record seems to be 

 the following statement by Mr. Gray:'' ''Mr. Swinhoe informs me 

 that this animal is common in the rivers of China and Formosa." 

 Swinhoe most likely confounded it with Amyda sinensis. Before 

 that time Gray liad also catalogued a specimen received from the 

 Leiden Museum as from " Japan," '^ but in Boulenger's Catalogue <^ 

 this specimen is enumerated as from "Java," which is most likely 

 correct. 



A description and references are appended, however, in order to 

 facilitate its identification should it really occur in Formosa. 



I may add that there is a specimen in the Hamburg Museum 

 (No. 110), acquired in 1877 and identified as "Trionyx subplanus." 

 It is said to be from "Japan," but no reliance can be placed on the 

 record. 



aA coined word without meaning. 



b Sitz. Ber. Akad. Wiss. Wien, Math. Naturw. CL, XCI, 1902, p. 818. 



c Proc. Zool. Soc. London, 1862, p. 265; Ann. Mag. Nat. Hist. (3), XII, 1863, p. 158. 



d Cat. Shield Rcpt. Brit. Mus., 1855, p. 69. 



«Cat. Chel. Brit. Mus., 1889, p. 247. 



