1152 TRAPKZOIDEUS 



Museum. Gould's shells are slightly plicate on the dorsal slope, 

 but this character is occasionally present even in adult 

 peguensJs. 



Var. corn plus (Deshayes and julien). 



.Shell small, more inflated than the type, rather thin. 



Length 32, height 18, diam. 10 mm. 

 Unio coinptus Deshayhs and Jui,ie;n, Arch, de Mus., X, 1874, 



p. 126, pi. V[, figs. 3, 4. — Haas, Conch. Cab., Unio, 191 2, pi. 



2>2>' fig- 2. 

 Traper;oidciis foliacciis var. coinptus Simpson, Syn., 1900, 



p. 858. 

 Unio fragilis Nevill, Jl. As. Soc. Beng., XLVI, 1877, p. 39. — 



Anderson, Yunnan Exp., 1877, p. 400, pi. lxxx, figs. 8-12. 



The figure by Deshayes and Julien shows quite a little plica- 

 tion on the dorsal slope. I have before me a specimen of Unio 

 fragilis Nevill, an author's specimen, which is a little smoother 

 on the dorsal slope, but does not appear to differ otherwise. 



Haas, (1. c), considers this a synonym of iniscllus. 



Var. saylcyniancnsis Preston. 



"Shell thinner and smaller than the typical form, more pro- 

 duced anteriorly and much more obtuse posteriorly ; the slight 

 curve in the ventral margin is also absent." (Preston). 



Type locality Bhamo ; also Zayleyman. 

 Trapczoidens foUaceus var. zaylcyuumcnsis, Preston, Rec. 



Ind. Mus., Vn, 1912, p. 307. 

 Trapezoideus foliaceus var. zaylciivanensis Haas, Conch. Cab., 



Unio, 1912, pi. 33, fig. I. 



Haas, (1. c), considers this a synonym of T. miscllus. 



Trapezoideus misellus (Morelet). 



Shell elongated, subarcuately rhomboid, thin, compressed, 

 inequilateral ; umbonal region somewhat elevated ; beaks rather 

 sharp ; posterior ridge full, feebly biangulate, ending behind in 

 a faint biangulation at and below the median line ; anterior end 

 narrowly rounded above, cut away below ; base line incurved 

 in the middle ; dorsal outline lightly arched ; dorsal slope ob- 



