164 



Unto mandelayensis, Theobald, J. A. S. B. xlii, 1874, p. 208, pi. 17, 

 fig. 2 : H. & T., C. I. 1876, p. 62, pi. 154, fig. 4 ; Psetel, Conch. 

 Sam. iii, 1890, p. 158. 



Original description : Testa subtriangulato-ovata, postice acunri- 

 nata, margine ventral! modice rotundato, umbonibus tumidiusculis, 

 laevigatis, pustulis parvis aliquando armatis, decorticatis. Epider- 

 mide tenuissima, laevi, subpolita, laete viridi, in senioribus flaves- 

 cente. Testa concentrice subrugata, lineis paucis sive rugis 

 angustis ligamentum versus plus minusve subradiatim notata, et 

 antice rugis paucis perbrevibus leviter corrugata. Deutibus cardi- 

 nalibus lamellatis, et denticulatis, in valva dextra singulo, multi- 

 fisso, in sinistra gemino, posteriore triangulari et umbonem juxta 

 posito, anteriore lainelliformi. striato. Nacrea argentea et viri- 

 descente. 



Long. 40, lat. 52, diam. 26 mm. 



Hab. !Near Bhamo; Pegu, Western Prome. 



To Theobald's description the following is appended : 



" A rare species in Western Prome where alone I have met 

 with it in Pegu, and remarkable for its smooth thin epidermis. 

 The posterior slope alone is conspicuous ly ornamented with 

 sculpture ; but in my largest specimen from Bhamo and in some 

 others also, the peculiar sculpturing of U. [P. (P.)] burmanus, 

 W. Blfd., is faintly but distinctly perceptible over part of the 

 valves towards the umbones especially." 



295. Parreysia (Parreysia) pernodulosa, Preston. 



Parreysia (Parreysia} pernodulosa. Preston, Rec. Ind. Mus., Calcutta, 

 vii, 1912, p. 300. 



Original desertion : Shell small, ovate, dark brown ; both 

 valves sculptured anteriorly with coarse, corrugate ridges, which 



Fig. 15. 1 & 2. Parreysia pernodulosa, Preston. (Type.) Nat. size. 

 3. Hinge of same. 



become more nodulous and irregular in the median and posterior 

 regions ; umbones rather large ; dorsal margin rapidly sloping 

 anteriorly, slightly sloping posteriorly; ventral margin somewhat 



