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DESCKIPTIONS OF FIVE NEW SPECIES OF MOLLUSCA OF THE 

 GENERA DRILLIA, MARGINELLA, APICALIA, PLESIO- 

 TROCHUS, AND RINGICULA, ALL FROM CEYLON; ALSO 

 NOTES ON THE GENUS PLESIOTROCHUS. 



By G. B. SowERBT, F.L.S. 



Read 8th January, 1915. 



Drillia pr^claka, n.sp. 



Testa fusiformis, argenteo-nitens, fusfo strigata ; spira acuminata, 

 acuta, ad apicem olitiisiuscula ; anfractus 8, apicales (li-2) laeves, 

 rotundati, csetei'i loiigitudiiialiter costati, costis crassis, superne 

 intersectis ; anfractus ultiinus spiram fere aequans, leviter convexus, 



sinistrorsum varieosus ; apertura obloiiga, breviter canaliculata, 

 labrura extus valde iiicrassatum, ad marginem acutum, postice 

 profunda sinuatum. Long. 9, diam. maj. 3 mm. 



Hab. — 'Irincomalee, Ceylon. 



A bright shining little shell, of an almost nacrous lustre. 



Maeginella caetwrighti, n.sp. 



Testa niinuta, oblongo-ovata, utrinqne leviter attenuata, alba, 

 translucida ; spira callosa, contecta ; apertura angusta, arcuata ; 

 columella callosa, antice plicis sex perminutis instructa; labrum 



leviter arcuatulum, extus rotundatum, Iseve, intus minutissime 

 denticulatum. Long. 2, diam. 1 mm. 

 Hub. — Trincoraalee, Ceylon. 



