326 
PACIFIC SCIENCE, Vol. IX, July, 1955 
Fig. 1 . a-c , Frontal, basal, and apical aspects of the shell of Orpiella (0 war aha) nissani n. sp. (holotype, 3.04 
X 2.32 mm.), d, The shell of Paludinella solomonensis n. sp. (holotype, 2.36 X 1.36 mm.), e-g, Apical, basal, and 
frontal aspects of the shell of Gyropena nissani n. sp. (holotype, 2.04 X 0.92 mm.), h, The shell of Syncera nitida 
guamensis Abbott (Nissan Island, 3.18 X 1.86 mm.). 
guamensis shows a wider shell than the Nissan 
specimens but his measurements indicate that 
both forms have almost identical proportions. 
Since later work may show that the Solomon 
Island form is separable, a specimen from 
Nissan is figured and the dimensions of five 
specimens are given below. 
HEIGHT OF 
HEIGHT OF 
HEIGHT 
DIAMETER 
BODY WHORL 
APERTURE 
(mm.) 
(mm.) 
(mm.) 
(mm.) 
3.18 
1.86 
2.0 
1.27 
2.73 
1.59 
1.77 
1.13 
2.59 
1.73 
1.73 
1.13 
2.95 
1.68 
1.77 
1.13 
2.95 
1.73 
1.86 
1.13 
Genus Orpiella Gray, 1855 
1855 Orpiella Gray, Pulm. Brit. Mus p. 147. 
Haplotype: Helix Scorpio Gould. 
Baker (1941: 239) gives a full synonymy 
for this genus. He also proposes (p. 240) a 
new section, Owaraha for Helix solidiuscula 
Smith from the Solomon Islands, and this 
name probably is available for all the Solomon 
Island species, previously assigned to Fretum , 
Kalendyma , and Nanina . Rensch and Rensch 
(1936) has used Orpiella for compluviata (Cox), 
concava (Clapp), malaitaensis (Clapp), treasur- 
yensis (Tryon) , pamuaensis (Clapp) , keppelli 
(Pfeiffer) and solidiuscula (Smith) . 
A small species was obtained on Nissan 
which does not agree with any other species 
recorded from the Solomons. It is here de- 
scribed as new. In the absence of the animal 
it may be tentatively assigned to Orpiella 
(Owaraha) . 
Orpiella (Owaraha) nissani n. sp. 
Fig. 1 a-c 
Shell small globose-turbinate, perforate, 
translucent, shiny brown. Whorls five and a 
half, narrowly increasing, periphery evenly 
rounded. Embryonic whorls sculptured with 
microscopic spirals crossed by axials of 
