I 170 T.AMKI.LIDENS 



'J'ype locality, Sawaddy River ; also Bhamo ; Sawaddy, Teng- 

 liiii? Stream : Shnay.s^oomya. Cpper Burma ; Mandalay, Upper 

 Burma. 

 Lamellidcns marghialis var. sawaddyensis Preston, Rec. Ind. 



Mus., VII, 1912, p. 305. 



Lameludens Burmanus n. n. 



Shell trapezoid, rhomboid, narrowed in front, scarcely sub- 

 solid, convex, inequilateral ; beaks low ; posterior ridge semi- 

 double, faintly biangulate, ending near the base in a biangula- 

 tion ; dorsal and basal outlines curved ; anterior end rounded ; 

 dorsal slope obliquely truncate, joining the dorsal line with a 

 blunt angle ; surface irregularly, concentrically striate ; epider- 

 mis brown, shaded with green and yellowish ; teeth com- 

 pressed ; laterals and often the pseudocardinals curved, the two 

 sets widely separated ; nacre bluish, orange-tinted in the cavi- 

 ties. 



Length y2, height 44, diam. 21 mm. 



Houngdaran, Burma. 

 Unio piikhcr Tapperone-Canefri, Ann. Mus. Civ., MI, 1889, 



P- 350- — Haas, Conch. Cab., Unio, pi. 33, figs. 7-8. 

 Lamellidens pidchcr Simpson, Syn., 1900, p. 856. 



More decidedly rhomboid than any specimens of marginalis 

 I have seen, more narrowed in front and shorter in proportion 

 to height. The National Museum possesses two specimens 

 from Fea that I believe are authentic. 



Haas, (1. c), considers this a synonym of PliysiDiio microp- 

 fcrus. 



Lamei.i.idhxs niTRMANUS n. n. 



Shell slightly obovate, or elliptical, subinf^atcd, ine(|uilateral. 

 rather thin ; beaks moderately full ; posterior ridge narrowly 

 rounded, ending in a point about on the median line ; anterior 

 end rounded ; dorsal slope slightly, obliquely truncate ; surface 

 nearly smooth : epidermis rich chestnut-brown, with narrow or 

 wide zones of yellowish, shining; pseudocardinals compressed; 



