8 NOETLING: MARINE FOSSILS FROM MIOCENE, UPPER BURMA. 



above-named species. The sculpture consists of fine, flat, radiating 

 ribs of equal strength, which are separated by interstices of about 

 the same breadth. Numerous fine horizontal striae produce a kind of 

 network in the interstices, while the ribs become granular ; some 

 of the ribs occasionally bifurcate, but only one of the specimens 

 exhibits this character. 



Locality, — Pretty rare at Yenangyat. 



Remarks t ~-\ldLv'mg compared the fossil specimens with the living 

 Daphoderma caelata> Reeve, I cannot discover any difference be- 

 tween them as regards the sculpture of the shell, and I regard therefore 

 Area burnesi, d'Arch., as identical with the species just mentioned. 

 In a fossil state it seems to have a wide range of distribution, being 

 found in Western India, Burma, Java and Timor. Vertically it 

 probably makes its first appearance in the Khirtar group of Sind. 



NUCULA ALCOCKI, Spec, nov., Plate I, Fig. 5—7. 

 The shell is triagonal, considerably longer than high ; the beaks 

 low, depressed, situated in the anterior third of the length ; anterior 

 margin short, slightly concave, forming nearly a right angle with the 

 convex ventral margin ; dorsal margin straight, meeting the ventral 

 margin at a pointed angle ; hinge consists of sharp transverse teeth ; 

 cartilage pit deep and obliquely turned backwards ; ventral margin 

 crenulated. Surface covered with fine equidistant radiating striae ; 

 lunula well defined and covered with a few fine transverse ribs ; 

 escutcheon less well defined, but covered with one row of short 

 transverse granulations which increase in size from the beak back- 

 wards, till about two-thirds of the length, and then again become 

 smaller. 



Dimensions. 

 Height. Length. Thickness. 

 12 mm. 17 mm. 8 mm. 



Locality.— Minbu and Yenangyoung, pretty common. 

 Remarks — This pretty species is easily distinguished from other 

 ( 8 ) 



