28 NOETLING: MARINE FOSSILS FROM MIOCENE, UPPER BURMA. 



granular appearance. Irregular varices sometimes present. Outer 

 lip sharp, denticulate, united with the last varix. 

 Locality % — Rare at Yenangyat and Minbu, 



Remarks, — This form resembles so closely Cassidaria desori y 

 d'Arch. and Haime, that I first hesitated in giving it a new name, but 

 after some consideration I think I am justified in doing so because 

 d'Archiac does not mention the longitudinal striae, which give such 

 a peculiar appearance to the revolving ribs of Cassidaria dubia; it 

 appears, however, that Cassidaria desori is founded on some imperfect 

 specimens only, and it is therefore quite probable that if some better 

 preserved specimen were found and examined, the identity of these 

 two forms might be proved, in the meantime we have to be satisfied 

 with having our attention drawn to the close relationship of the two 

 species. 



CASSIDARIA MINBUENSIS, Spec, nov., Plate VI, Fig. 4—45. 



The small shell consists of at least five angular whorls, of which four 

 form a moderately elevated spire ; a strong keel runs about in the 

 middle of the whorls, and from this the surface slopes slightly to 

 the deep suture ; the last whorl is high, rather attenuated in front, 

 terminating in a short sub-ascendant canal. The sculpture consists 

 of thick revolving ribs, leaving only very narrow interstices 

 between them ; these are crossed by longitudinal ribs of equal 

 strength, which become nodular by the crossing of the revolving 

 ribs and die out towards the front of the last whorl. Aperture 

 narrow ; outer lip sharp, dentate ; inner lip broad and plicose. 



Locality. — Rare at Minbu and Yenangyat, 



FICULA THEOBALDI, Spec, nov., Plate VI, Fig. 5—50. 

 The pear-shaped shell consists of five whorls, of which four form 

 the low depressed spire ; the last whorl is ventricose and terminates 

 in a short canal ; except the first two or three whorls which are 

 smooth, the shell is covered with 15 to 18 fine equidistant revolving 

 ribs ; in the middle between two such ribs there runs another which 

 is slightly thinner, and in the two halves of the interstice thus 

 divided, there are three more ribs, of which the median one is a little 



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