36 N0ETL1NG: MARINE FOSSILS FROM MIOCENE, UPPER BURMA, 



MUREX (MURICIDEA) Sp. 

 Although specimens belonging to this genus are pretty common, 

 none of them are sufficiently well preserved to allow a specific de- 

 termination ; so far as can be seen, the shell was rather globose, ter- 

 minating in a moderately long canal ; the spire is low, the last whorl 

 ventricose ; ribs and varices of nearly equal strength and crossed by 

 coarse revolving ribs, in the interstices of which there are usually 

 three fine revolving lines, of which the middle one is a little stronger 

 than the other two. The aperture is small, the inner lip slightly 

 spread across the columella ; outer lip sharp, united with the last 

 varix ; on the end of the columella a few shaly spines, which are 

 apparently formed by the termination of the longitudinal ribs. 

 Locality, — Rather common at Minbu and Yenangyat. 



MUREX TCHIHATCHEFFI, d'Arch., Plate VIII, Fig. 5. 



1853. Murex Tchihatcheffi, d'Archiac and Haime, Descr. des Anim. foss. du groupe 



nummulitique de 1'Inde, page 311, plate XXIX, fig. 23. 



The single specimen shows well the subangular inflated whorls* 

 divided by a deep suture ; there are nine, strong club-like, slightly 

 oblique, longitudinal ribs on each whorl ; the ribs are thickest near 

 the keel and accuminate towards the base ; those of the last whorl ex- 

 tend on the columella, where, however, they form only tile-like laminae. 



Locality. — Rare at Yenangyat. 



Remarks,*— Although very incompletely preserved, it still shows 

 such characters as to leave no doubt about its identity ; the fine 

 revolving lines which d'Archiac mentions are only imperfectly seen in 

 the specimen from Burma which was apparently much rolled. 



MUREX ARRAKANENSIS, Spec, nov., Plate VIII, Fig. 6— 6b. 

 The pyriform shell consists of a low spire, of about four whorls, 

 and a high ventricose last whorl attenuated in front and terminating 

 in a short closed canal. There are three varices, ending in short 

 spines, which correspond to moderately strong revolving ribs : 

 between the latter numerous fine revolving lines ; aperture oval ; 

 outer lip thick, inner lip reflected and sharp. 



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