PELECYPODA. 



*3 



has been found, and that even this does not exhibit the characteristic 

 features sufficiently ; but I think that it shows the greatest resem- 

 blance to the above species, which according to Hoernes is very 

 common in the " Tegel " of the Vienna basin. 



VENUS, if. 



Numerous fragments of a shell covered with fine concentric striae 

 may probably belong to this genus; they are, however, too badly 

 preserved, although they are pretty common, to allow of a specific 

 determination. 



Locality. — Common at Minbu. 



TELLINA (TELLINELLA) HILLI, Spec, nov., Plate III, Fig. 5— 6a. 



I have before me some fragments of a shell belonging to this 

 genus which exhibit such characteristic features, especially as 

 regards the posterior part of the valve, that notwithstanding their 

 incompleteness, the distinguishing features can be fixed. The 

 shell was fiat, triangular in shape ; the ventral margin is regularly 

 rounded but slightly cut out towards its posterior end, where it forms 

 a pointed angle with the short straight posterior margin. A sharp 

 keel runs from the beak to the junction of the ventral and posterior 

 margin ; and the part thus divided off is marked by a fine sharp 

 furrow in the middle, and a similar sharp keel at the dorsal edge, the 

 latter running from the beak to the upper end of the posterior 

 margin ; the posterior half of the shell is covered with fine, regular 

 horizontal ribs, which pass the radiating keels, where they produce a 

 kind of granulation; forwards the ribs die out quite suddenly, so that 

 the anterior side is perfectly smooth excepting some striae of growth, 



Locality. — Rare at Yenangyat. 



Remarks. — It was with some hesitation that I founded a new 

 species on so incomplete specimens as those under examination, but 

 the peculiar character of the surface sculpture justifies this procedure. 

 The nearest fossil form is perhaps Tellina exarata> Sowerby from the 

 Cutch Tertiaries ; this species is, however, very imperfectly known, as 

 according to Mr. Sowerby the surface has been restored. If it was 

 the posterior part which was preserved in Tellina exarata, the 



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