440 
REGISTOMA COMPLANATUM. 
Shell elongately circular, light, thin, pellucid, vitreous, straight ; 
whorls six, last slightly oblique, surface smooth, enamelled [sutures 
marginated (?) but covered with enamel, rendering the entire surface 
smooth]; apex obtuse; aperture nearly circular (semilunar) ; outer 
lip slightly thickened externally ; inner lip notched at base. Colour 
light brownish yellow. 
8. Description or New Nucuiipz2. By Sytvanus HANLEY. 
Leva conrapbi. T. subovato-acuta, postice longior et acutissime 
acuminata, valde inequilateralis, radii impressi expers, cute sub- 
olivaceo-flava induta, costis crassis concentricis (ad marginem 
plice umbonalis angularem pluribus) et sulcis superne latis, inferne 
angustis, undique sculpta. Margo dorsalis antice subdeclivis ; 
postice rectiusculus, declivis. Area magna, angulatim definita, 
inferne plicato-corrugata. Lunula nulla. 
Long. 3, lat. 2 poll. 
Hab. 2 
Mus. Taylor. 
The form reminds one of Conrad’s L. eborea, but the sculpture 
differs. The ribs on the posterior ridge form obtuse angles with the 
concentric ones. 
Leva Brookit. T. minuta, subequilateralis, late ovato-conica, 
postice repente acuminata, virque recurvata, ventricosa, eburnea, 
radii impressi expers, undique concentrice costata; interstitia 
costarum angustarum e@qualiter lata, in medio levia, utrinque 
creno-lirata. Margo dorsalis antice brevis, satisque declivis ; 
postice rectiusculus, declivis ; ventralis conspicue arcuatus, postice 
rectior multumque acclivis. Area magna, plica umbonali depressa 
creno-costata definita. Lunula sublevigata, sulco circumscripta. 
Long. =; poll. 
Hab. Insula Borneo. 
Mus. Cuming. 
In the larger of the only two examples known to me, the front 
dorsal area is traversed by a kind of interrupted continuation of the 
ribs. 
Lepa uinpsi. T. parva, subequilateralis, anguste ovato-acuta, 
antice plica sulcoque lato radiata, postice costa umbonali carinata, 
superficiem levigatam superiorem sequente, munita, alibi concen- 
trice costellata ; interstitia lyris minutis undique decussata. Ex- 
tremitas postica acuminata, vix recurvata. Area magna, concava, 
arcte longitudinaliter costellato-striata ; interstitia impressa, punc- 
tulata. Lunula parva, transversim tuberculata, 
Long. 2 poll. 
Hab. Nicoye fretum? 
Mus. Cuming, Hanley, Metcalfe. 
