TAind- Shells from New Guinea. 417 



concavxim, parte promiiientc coiiica, cava, in medio instructuni, 

 subtus convoxum, Havesccng, gyros 4-5 exhibens. 

 Diain. maj. A\ niillim., ruin. 3^ ; alt, 2^. 



Hah, Kajiaur. 



Tlie shells of this genus closely resemble certain forms of 

 Ditropis (e. g. D. planorhis^ Blanford), which comprises about 

 twenty-two species from Africa, India, Borneo, Java, fSulu 

 Islands, Aniboina, Ilaruku, Fitzroy Island, N.E. Au.-^tralia, 

 and the I'hilippine Islands. I'hose from the last locality 

 liave been associated with it on concliological characters 

 only, the opercula being either unknown or undescribed. The 

 peculiarity in the operculum distinguishes the present genus 

 from Ditropis. Perliaps Ditropis spiralis of Boettger, from 

 Haruku Island, also belongs to Ditropopsis. Probably very 

 few of the so-called species of Ditropis found outside India 

 have the precisely typical operculum of that genus. It really 

 becomes a question whether these differences of structure in 

 the o];erculum are of more than specific importance. 



The upper part of the spire of this interesting species has 

 tlie appearance of being segmented within the v^horls. 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 (?) Fultoni. (PI. IX. figs. 24-26.) 



Testa conica, perspective umbilicata, pellucida, albida, cornea, 

 nitens ; anfractus 4|, apicales 1-2 (nucleus) vitrei, convex!, 

 baud carinati, excentrici, soluti, apicem spirae baud claudentes, 

 caDteri convexi, in medio angulati et plus minus carinati, inferne 

 ad suturam carino-marginati, striis incrementi tenuissimis sculpti, 

 ultimus ad peripberiam carina acuta, lata, compressa, et altera 

 circa umbilicum instriictus, baud descendens ; spira conica, tabu- 

 lata, ad apicem perforata ; apertura rotundata, ad carinas angu- 

 lata ; peristoma intus incrassatum, plus minus duplex, marginibus 

 callo teuui junctis, supero et inferiore leviter expansis, ad carinas 

 subcanaliculatis. Operculum ignotum. 



Diam. maj. 3 millim., min. 2| ; alt. 2^. 



Hah. Kapaur. 



Ditropis mgenua^ Boettger, from North Araboina, 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. 



