358 
Fig. 1. Lamellidea solomonensis n. sp. a, Holotype, 
2-95fX 1.54 mm.; b, juvenile shell, 1.68 X 1.14 mm.; 
c, aperture of six-whorled paratype, 3.32 X 1.5 mm.; 
d, aperture of five-and-a-half-whorled paratype, 3.0 X 
1.54 mm. 
Lamellidea solomonensis is closely related by 
shell characters to L. microstoma (Quadras and 
PACIFIC SCIENCE, Vol. IX, July, 1955 
TABLE 1 
Data on the Shells of Lamellidea solomonensis n. sp. 
(Measurements in Millimeters) 
HOLOTYPE 
PARATYPE 
PARATYPE 
Number of 
whorls 
5 VS 
6 
5 Vi 
Length 
2.95 
3.32 
3.0 
Diameter. . . . 
1.54 
1.54 
1.54 
Length of last 
whorl 
1.82 
1.95 
1.86 
Aperture 
axis 
1.04 
1.09 
1.04 
Diameter 
0.68 
0.77 
0.68 
Moellendorff) and L. suhcylindrica (Quadras 
and Moellendorff) from the Mariana Islands. 
From L. microstoma it differs in the outline of 
the whorls and the subsutural constriction 
and from L. suhcylindrica it may be distin- 
guished by the slightly appressed suture and 
the subsutural constriction. The occasional 
channelling of the body whorl about the mid- 
dle in L. suhcylindrica is foreshadowed in the 
flattening of the body whorl in L. solomonensis . 
The genus Lamellidea has been recorded 
from the Polynesian islands as far to the east 
as Hawaii, from the Marshall, the Mariana, 
and the Bonin Islands. 
