Species of Land- Mollusca from Borneo . 245 
collection through Mr. A. Everett, made in the hills of 
Borneo by Mr. C. Hose, and I have to thank them both for 
the further assistance they have thus given to me. We are 
apparently only beginning to know the richness of the land- 
molluscan fauna of this great island, so that as it becomes 
explored in all parts what a wealth of new species we may 
expect it will produce ! Two shells I now describe present 
a remarkable difference from the hitherto known species of 
Opisthostoma from India and the Malay peninsula in being 
more or less spined, the first and finest example yet dis- 
covered being 0 . grandespinosa , in which the spines are 
developed in a peculiarly beautiful way. The same variation 
in Borneo extends to the genus Diplommatina , as exemplified 
in D. spinosa . Further exploration by naturalists who know 
how and where to . find these minute shells will no doubt 
bring to light others equally interesting. 
The species of Diplommatina now described was sent to me 
to examine with other species by Mr. Aldrich, of Cincinnati, 
U.S.A., to whom a collection of Bornean shells had been sent, 
and a list of which he gave in a paper published in the 
Journ. Cincinnati Soc. Nat. Hist. April 1889, p. 23. This 
shell he thought might be D. concinna , Adams ; but it is not 
that species, and I have much pleasure in naming it after 
Mr. Aldrich. 
I take this opportunity of giving drawings (PI. VII. 
figs. 4, 5) of two species described in my paper quoted above, 
pp. 342, 343, but which were received too late to include in 
the plates which illustrated it ; they are Rhiostoma Hunger - 
fordi and iris . 
Opisthostoma pulchella, sp. n. (PI. VII. fig. 1.) 
Shell pyramidal, thin, narrowly perforate ; sculpture, wavy 
costulation on a smooth surface ; upon the lower whorls this 
forms the base of sharp, thin, white cirque-like bands standing 
at right angles to the whorl ; on the penultimate and antepe- 
nultimate these in the centre are produced into short spines ; 
they are generally found worn off at an early stage of growth ; 
colour ochraceous with a golden tinge, nearly white on the free 
portion of the whorl ; spire conical ; apex papillate ; suture 
much impressed ; whorls 7 up to the constricted portion, 
whence the latter part is free and curved outwards from the 
axis and upwards ; aperture circular ; peristome double, very 
thin, much expanded, particularly the outer margin. 
Size : major diam. 2*2 ; alt. axis 2*3 millim. 
Locality . Baram district, Borneo ( 0 . Hose). 
Ann. & Mag. N. Hist. Ser. 6. Vol. vi. 
18 
