118 MELVILL AND STANDEN : SHELLS FROM LIFU. 
Adams as to the generic distinctness of both this and 
Alaba, also of Arthur Adams. 
Three species or perhaps more of this genus appear to occur, 
but so much difficulty attends the elucidation of the species, and 
so little is their distribution known, that it is impossible to arrive 
at any certainty on the subject. The genus, distinct in our 
opinion from Zz#iopa, as observed above, sadly needs a com- 
petent monographer. 
D. Hardyi sp. nov. (PI. II., fig. ro). 
D. testa pyramidato-fustformt, lactea, solida, nitida, anfrac- 
libus septem, apud suturas canaliculatis, undique regulariter 
striato-sulcatis, ultimo apud peripheriam angulato, apertura 
rotunda labro apud marginem columellarem ochraceo, 
Lone; 3°25 mul Lat arvs wl. 
A small milk-white species, very regularly striately sulcate, 
unicolorous and without markings. 
D. Hardyi £ prolongata var. nov. (PI. IIL., fig. 11). 
Whorls 8, more rounded, shell more elongate, not angled 
at the periphery. 
Long., 4 mill. Lat., 1°15 mill. 
ffab., Lifu and Uvea, with the preceding, in shell sand. 
These two forms occur together, and are distinct enough 
when taken notice of at first, but the more one studies them, 
the more they are seen to be joined by intermediates. The 
variety seems near D. sw¢uralis Adams from the Philippine Isles. 
We have much pleasure in connecting with this species the 
name of Mr. John Ray Hardy, of the Manchester Museum, 
Owens College, who has rendered us much assistance in the 
sorting and investigation of this Lifu collection of shells. 
D. ludens sp. nov. (Pl. IL, fig. 9). 
D. testa oblonga fustformi, solida, albescente, anfractibus sex 
planatis, levibus, in medio circégue basin ultimi anfractus 
sulcato-striatis, transversim albo tessellatis, precipué juxta 
suturas, et apud peripheriam, transversimque tnterruptis 
linets brunnets decoratis. Apertura rotunda, labro crassius- 
culo simplice. 
Long., 4 mill. Lat., 1°75 mill. 
Hab., Uvea (in shell-sand, from Mr. Hadfield). 
J.C., viii., Oct. 1895. 
