﻿210 IIYUIOJ'SIS 



IIvKiorsis cuMiNGii (Lea). 



Shell larg"e, rhomboid or trapezoid, with a sharp pointed 

 anterior wing and a very hii^h, somewhat irreg'ular posterior 

 win.q"; rather thin or only snbsolid ; compressed, with low, 

 much compressed beaks, which are sculptured with numerous 

 stronq' ridt^^es that nearly follow the ijrowth lines and extend 

 well out on to the disk ; surface shininj:^, the posterior wing 

 and hinder part of the shell sometimes corrugated by irregular 

 grooves ; folds of the posterior slope distinct ; color brownish 

 or yellowish-green with numerous rays; epidermis shining; 

 left valve with two small, compressed, rather elevated and 

 nearly vertical pseudocardinals, the anterior higher, and two 

 long, curved laterals ; right valve with two pseudocardinals, 

 the posterior higher, and one lateral ; beak cavities very shal- 

 low, showing a diagonal row of scars ; adductor scars shallow, 

 the anterior ones small ; pallial line very far removed from the 

 shell border; nacre bluish-white, with purple and green iri- 

 descence behind. 



Length 134, height, without wing 80, with wing 117, diam. 

 18 mm. 



China. 

 Unio cwningii Lfa, Pr. Ac. N. Sci. Phila., VII, 1852, p. 54.— 



Jl. Ac. N. Sci. Phila., IV, i860, p. 240, pi. xxxv, fig. 



120; Obs., VII, i860, p. 58, pi. XXXV, fig. 120.— SOWERBY, 



Conch. Icon., XVI, 1866, pi. xlix, fig. 264. — Heude, Conch. 



Fluv. Nank., VIII, 1883, pi. exiv. 

 Margaron (Unio) cumingii Lea, Syn., 1852, p. 19 ; 1870, p. 28. 

 Hyriopsis cumingii Simpson, Syn., 1900, p. 579. 

 Hyriopsis- goliath Roele, Nachr. Deutsch. Mai. Ges., 1904, p. 



25, pi. I and IT. — Dautzenrerg and Fischer, J. de Conch., 



LIII, 1905, p. 201. 



Lea's larger shell, the one whose dimensions are given above, 

 is evidentlv voung and probablv a female, as it is slightly 

 swollen at the post-basal part. He has a somewhat younger 

 shell which is straiijht on the basal line. 



