42 NOETLING: MARINE FOSSILS FROM MIOCENE, UPPER BURMA. 



Remarks.— The specimens from Burma agree in general shape 

 very well with K.Martin's figs. 66 and 67; but it seems, that the nodular 

 ribs are much stronger and broader in the Burma variety; when 

 rolled, the revolving lines easily wear away ; only the one just above 

 the slit is always preserved, which gives the shell rather a peculiar 

 appearance at first sight, but which makes it easily recognisable. 



PLEUROTOMA YEN ANENSIS, Spec. nov. t Plate X, Fig. 3—3*. 



All the specimens under examination being more or less muti- 

 lated, it is difficult to judge of the shape of the shell, but it was ap- 

 parently turreted, the whorls low, only gradually increasing in height 

 jand slightly rounded ; suture deep ; the sculpture consists of four 

 strong revolving ribs on the spire, and at least seven on the last 

 whorl ; one runs along the suture, and the next one below, which 

 marks the position of the slit, carries very regular low tubercules ; 

 finer lines are seen in the interstice and these are crossed by oblique 

 longitudinal lines producing a very fine net-like ornamentation parti- 

 cularly well visible on the lower part of the last whorl. 



Locality.-* Pretty common at Minbu and Yenangyat. 



CONUS (RHIZOCONUS) MALLACANUS, ffwass, Plate X, Fig. 4— 70. 



1879-80. Conus javanus, K. Martin, die Tertiar Schichten auf Java, page 12, plate 



II, fig. 3- 



The conical shell has a slightly raised spire ; on the upper side 

 the whorls, show from four to five, very fine revolving lines, and on the 

 : earlier whorls the keel was lined with indistinct tubercules, from which 

 issued short and faint ribs ; they disappear, however, very soon, and 

 except for some striae of growth, the keel and surface of the last 

 whorl are perfeotly smooth ; on the anterior end of the latter a number 

 of fine revolving lines can be seen ; aperture narrow ; outer lip sharp 

 and straight. 



Locality.— .Very common at Minbu ; rare at Yenangyat. 



Remarks. — K. Martin founded this species on a single specimen 

 from Java, and it may be doubted whether a single specimen of Conus 

 t 4* % 



