Unionidse from East Asia. 499 



5. Cristaria inangulata, sp. n. 



Shell short-elliptical, nearly unwinged, rather thin and 

 inflated, rounded in front and behind. Posterior ridge 

 rounded, low. Basal margin regularly curved. Beaks not 

 prominent, situated at y s 5 o£ the total length, with low wide 

 ridges grouped round an apical protuberance, the first ones 

 doubly looped, the following ones becoming slightly undulate. 

 Epidermis greenish brown, shining, rayed. Hinge con- 

 sisting of a single, low, lamellar prseumbonal, and a single, 

 low, nearly reduced, postumbonal claustrum in each valve. 

 Anterior cicatrices faint, that of the anterior adductor and 

 that of the anterior retractor confluent. Posterior cicatrices 

 confluent, faint. 2-3 dorsal cicatrices lying in a row, often 

 united to a groove, situated under the beaks. Beak-cavities 

 shallow. Nacre reddish, bluish towards the edge. 



Length 99, height 59, diam. 39 mm. 



Jlab. Tonkin. Collected by Mr. Messager. 



Four specimens in the Senckenberg Museum, purchased 

 from Mr. H. Kolle. 



6. Anodontites lautas tumens, subsp. n. 



A highly inflated form of A. lautus, Marts., characterized 

 by the strong ridges of the beak-sculpture, which, on the 

 upper part of the disk, become very high and nearly terrace- 

 shaped. There exist all the intermediate stages between the 

 type form and this subspecies. 



Hob. Yamashiro, Japan. 



Three specimens in the Senckenberg Museum, presented by 

 Messrs. Sowerby and Fulton. 



7. Cristaria discoidea sautteri, subsp. n. 



Differs from typical discoidea by the strongly developed 

 claustra, which are double in the left valve in their prie- 

 umbonal as well as in their postumbonal portion. 



llab. Lake Candidins, Formosa. Collected by Mr. Sautter. 



Three specimens with the animals preserved in alcohol and 

 three pairs of shells in the Senckenberg Museum. 



8. JSodularia douglasiod crassidens, subsp. n. 



Among the typical specimens of iV. douglasice of nearly all 

 localities, there occur heavy inflated shells with extremely 

 thick and deeply jagged cardinals and strong curved laterals, 

 upon which I bestow the subspecific name of crassidens. I 

 have examined specimens from Hainan, from Hunan, and 

 from Ningpo, Northern China. 



