﻿Vol. 64.] GEOLOGY OF BUEMA. 635 



in A. manensis. Area articulata, Deshayes/ from the Lutetian, is 

 less regular in shape, while A. Boutillieri^ Cossmann,^ from the 

 same horizon, is smaller, and has coarser ornamentation, but other- 

 wise is very similar to the present form. 



Locality. — 2 miles south by east of Magyisan (Minbu district). 



Glycimeeis sp. 



Description. — Shell rounded, inflated, almost symmetrical, 

 valves closed, margins dentate. Ornamentation unknown. Hinge- 

 surface flat, teeth not observed. 



Locality. — Near Xyetubok (Minbu district). 



Family OsTEEiniE. 



OsTEEA YOMAENsis, sp. nov. (PI. LIY, figs. 2 & 3.) 



Description. — Shell thick, irregularly inflated. Left valve 

 with irregular, concentric, foliaceous and radial sculpture : deformed 

 towards the beaks, with a marked depression anteriorly and a large 

 cartilage-groove and scar of attachment. Right valve smaller, 

 with fairly-fine concentric scaly sculpture only ; somewhat de- 

 pressed anteriorly. 



Dimensions in millimetres. — Eight valve : length =51, 

 height =74; left valve: length =58, height =100. 



Remarks. — This species appears to be very much akin to 

 Ostrea Raincourti, Deshayes,^ from the Paris Eocene, which, how- 

 ever, has no anterior depression : on the other hand, the latter 

 may not be a permanent character, especially in view of the fact 

 that a worn specimen of Ostrea from the same neighbourhood, 

 probably 0, yomaensis, has no such mark. 



Locality. — Near Thabyemyoung (Thayetmyo district). 



Alecteyonia Newtoni,* sp. nov. (PL LIV, fig. 4.) 



Description. — Left valve only. Thick, showing the scar of 

 attachment and grasping processes. Strong radial folds and wavy, 

 concentric, lamellar sculpture. Margin undulating. Cartilage- 

 groove short, truncate, turned in the dorsal direction, and bounded 

 by fairly well-marked ridges. 



Dimensions in millimetres. — Left valve, length =31^ 

 height =43. 



1 ' Description des Animanx sans Vertebres decouverts dans le Bassin de 

 Paris ' vol. i (1860) p. 882 & pi. Ixx, figs. 7-9. 



^ ' Iconographie complete des Ooquilles Fossiles de I'Eocene des EnTirons de 

 Paris ' 1904, pi. xxxvi, fig. 110-19. 



3 • Description des Animanx sans Vertebres d6couverts dans le Bassin de 

 Paris ' vol. ii (1860) p. 103 & pi. Ixxxiii, figs. 10-11 ; and Cossmann & Pissarro, 

 * Iconographie complete des Coquilles Fossiles de TEoceue des Environs de 

 Paris ' 1904, pi. xlii, fig. 135-10. 



* Dedicated to Mr. E. Bullen Newton, F.G.S. 



Q. J. G. S. No. 256. 2 u 



