GASTROPODA. 37 



Locality.— Rare at Yenangyat and Minbu. 



Remarks.— \ cannot find any other species with which M. arret- 

 kanensis could be compared but Murex javanus, K. Martin ; the 

 latter is, however, easily distinguished by the long canal and the 

 strong spines, 



VOLVARIA BIRMANICA, Spec nov. t Plate VIII, Fig. 7— 7c. 



The shell is subcylindrical in shape ; the spire is very short and 

 nearly perfectly concealed ; the surface is covered with fine, regular 

 revolving furrows, which are divided by very fine longitudinal striae 

 Into very regular small squares ; the ribs between the furrows are of 

 about double the breadth of the former and perfectly smooth, except 

 for some occasional striae of growth, but the fine longitudinal lines 

 never extend on to the ribs. The columella is straight, a little callous 

 on the posterior end ; four moderately thick oblique plaits on the an- 

 terior end ; outer lip thick and slightly crenulated ; aperture narrow. 



Locality.— -Rare at Minbu. 



Remarks. — The peculiar sculpture and the four plaits on the an- 

 terior end of the columella distinguish this species from all the others ; 

 the nearest species is Volvaria multicingulata, Sand., from the 

 tertiary formation of the Mayence basin ; this species \s, however, 

 easily distinguished by the smaller number (3) of plaits on the 

 columella, which are apparently thicker and by the longitudinal 

 striae running across the furrows and ribs alike, so that a kind of 

 chequered sculpture is produced. 



VOLUTA DENTATA, Sow., Plate VIII, Fig. 8—10. 



1840. Voluta dentata, Sowerby, Transact. Geol. Soc. of Lond., 2nd ser., vol. V, 



plate XXVI, fig. 26. 

 1853. Voluta dentata, d'Archiac and Haime, Desc. des Anim foss. du groupe 



nummulitique de l'Inde, page 324, plate XXXII, figs. 2, 2a, 



plate XXXIII, fig. 11. 

 1853. Voluta cythara, d'Archiac and Haime, ibid, page 325, plate XXX 1 1, figs. 4, 5* 



The turbinate shell consists of five whorls, of which four form the 

 low turreted spire ; the last whorl is very high, accuminated in front; 

 pretty close to the suture runs a sharp keel above which the surface 

 D * ( 37 ) 



