Land-Shells from New Guinea. 417 
concayum, parte prominente conica, cava, in medio instructum, 
subtus convexum, flavescens, gyros 4—5 exhibens, 
Diam. maj. 4} millim., min. 33; alt. 23. 
flab. Kapaur. 
The shells of this genus closely resemble certain forms of 
Ditropis (e. g. D. planorbis, Blantord), which comprises about 
twenty-two species from Africa, India, Borneo, Java, Sulu 
Islands, Amboina, Haruku, Fitzroy Island, N.E. Australia, 
and the Philippine Islands. Those from the last locality 
have been associated with it on conchological characters 
only, the opercula being either unknown or undescribed. The 
peculiarity in the operculum distinguishes the present genus 
from Ditropis. Perhaps Ditropis spiralis of Boettger, from 
Haruku Island, also belongs to Dztropopsis. Probably very 
few of the so-called species of Dztropis found outside India 
have the precisely typical operculum of that genus. It really 
becomes a question whether these differences of structure in 
the operculum are of more than specitic importance. 
The upper part of the spire of this interesting species has 
the appearance of being segmented within the whorls. What 
the cause of this remarkable partitioning may be could only 
be ascertained by more or less destroying one of the few speci- 
mens at present known. 
Ditropopsis (?) Fultont. (Pl. IX. figs. 24-26.) 
Testa conica, perspective umbilicata, pellucida, albida, cornea, 
nitens; anfractus 44, apicales 1-2 (nucleus) vitrei, convexi, 
haud carinati, excentrici, soluti, apicem spire haud claudentes, 
cxeteri convexi, in medio angulati et plus minus carinati, inferne 
ad suturam carino-marginati, striis incrementi tenuissimis sculpti, 
ultimus ad peripheriam carina acuta, lata, compressa, et altera 
circa umbilicum instructus, haud descendens ; spira conica, tabu- 
lata, ad apicem perforata; apertura rotundata, ad carinas angu- 
lata ; peristoma intus incrassatum, plus minus duplex, marginibus 
callo tenui junctis, supero et inferiore leviter expansis, ad carinas 
subcanaliculatis. Operculum ignotum. 
Diam. maj. 3 millim., min. 23; alt. 23. 
Hab. Kapaur. 
Ditropis ingenua, Beettger, from North Amboina, has the 
apex of the spire very similar to that of this species, but the 
operculum is not that of Ditropopsis. I have much pleasure 
in naming this species after Mr. Hugh Fulton, who has kindly 
submitted it to me for examination. 
