26 NOETLING : MARINE FOSSILS FROM MIOCENE, UPPER BURMA, 



channelled at either end ; inner lip strongly crenulated ; outer lip 

 inflected, thickened and equally strongly crenulated. 



Locality. — Common at Minbu and Yenangyat. 



Remarks. — This species attains a considerable size ; specimens 

 from Yenangyat, although crushed, measured certainly not less than 

 26 mm. in length, but such are rather rare ; the most common are 

 those of 17 mm. in length. Messrs. d'Archiac and Haime put special 

 stress on the difference of the denticulation of both lips ; this how- 

 ever depends entirely on the state of preservation and on the way in 

 which the light is reflected ; if there is a difference, it is that the 

 denticulation of the outer lip is slightly stronger than that of the 

 inner, but it is so small that it is hardly perceptible. 



TRIVIA SMITHI, K. Martin, Plate V, Fig. 13— 13c. 



1883-87. Cyprsea (Trivia) smithi, K. Martin Beitrag. zur Geolog. Ost. Asiens, vol. III. 



page 141, plate VIII, fig. 14. 



The shell is small, not longer than 10 mm., but very ventricose 

 the last whorl being 6 mm. high ; the aperture is very narrow 

 with a short canal at either end ; the outer lip is inflected ; the 

 surface is covered with sharp fine ribs, which form the continuation 

 of the crenulations of the inner and outer lip resp., which starting from 

 the aperture meet on the opposite side of the last whorl, in such 

 a way that the ribs from both sides alternate, being separated by 

 an indistinct dorsal sulcus ; however, not all the ribs reach up to the 

 middle, but some of them die out before. Very fine transverse 

 striae may be seen between the ribs. 



Locality. — Rare at Yenangyat. 



Remarks. — The character of the sculpture, as described above, 

 makes it certain that the species from Burma is identical with the 

 form from Java, as none of the other species show such strong ribs 

 alternating on the top of the last whorl. 



It is remarkable that Trivia smithi finds its nearest relations 

 among the species from the West Indian seas rather than among those 

 from the Indian Ocean. Trivia pediculus, Lin., from the West Indian 

 sea is, for instance, closely related to this form. 



( 26 ) 



