310 MELVILL AND STANDEN: SHELLS FROM LIFU. 
columella white. We have this species also from Thursday 
Island. What appears to be another form of the same shell is 
also in the collection, with darker ochraceous spiral lines across 
the two last whorls, the longitudinal costee obscure, and here 
and there wanting, apical whorls dark-brown. 
Rissoia pyrrhacme sp. nov. (PI. XL, fig. 70). 
R. testa oblonga, delicatula, nivea, anfractibus novem (interdum 
octo), quorum apicalibus tribus, fulvo-ochracets, ceteris albts, 
ventricosis, ad suturas crenulato-impressis, longitudinaliter 
costulatis, spiraliter arcté sulculosis, apertura rotundo-ovata, 
labro simplice, paullulum effuso. 
Long., 6, Lat., 2 mull. 
_ A pure white ochre-tipped shell, whorls eight or nine, 
much swollen, longitudinally ribbed, spirally closely sulcate, 
aperture round, lip simple, a little effuse. We are not yet 
quite sure of the proper location of this and the preceding 
species, and only place them provisionally in A&zssora. If, 
indeed, they be Réssote, they will, perhaps, be better included 
in a new section of the genus. Several specimens. (avppos 
ochre red, «pm point). 
Mathilda eurytima sp. nov. (PI. XL, fig. 73). 
M. testa delicata, pyramidato-fusiformi, alba, anfractibus 
decem, ventricosis, ad suturas impressis, spiraliter acute trt- 
cavinatis, carinis angulatis, interstitiis longitudinaltter clath- 
ratulis, clathris arctis, sub lente consinnis, ultimo anfractu 
quadricarinato, bast tornata, apertura ovato-rotunda, labro 
simplice, canalt producto. 
Long, 6, Lat., 2 mill. 
A most delicately lovely, though minute shell. | A second 
specimen having occurred, the first, named provisionally 
M. sinensis by us in our last paper, has been carefully re-ex- 
amined and found to be distinct from that species. The 
spiral keels are only three on the upper whorls, as against 
four in AZ. sinensis, the shell is not of thickened texture, and the 
J.C., viii., Oct., 1896. 
