Land Snails of Ulithi Atoll— Harry 
221 
tively, as I have seen no material which was 
undoubtedly the type, cotype, or paratype of 
Pfeiffer’s nominal species. However, the Walker 
Collection at the University of Michigan con- 
tained several lots 'which are apparently of this 
same species, and which show it occurs in Lifu 
(Loyalty Islands), the New Hebrides, New Cale- 
donia, and Guam. The following redescription 
of this species is based on seven cotypes of 0 . 
submaritima (LJniversity of Michigan Museum 
of Zoology 77604), which is apparently a 
synonym. 
Shell (Fig. 14) dextral, ovate-conic, solid, 
pellucid, of 4 p2 suture whorls. The spire is 
moderately elevated, its profile forming an acute 
angle, but with the apex blunted. The suture is 
simple and deeply set, with the plano-convex 
whorls being arched sharply just below it, giv- 
ing the spire a stepped profile. Body whorl 
vaguely, obtusely angled at periphery. The um- 
bilicus is rimate and concealed by the partially 
reflexed columellar lip. The aperture is ovate- 
conic, with outer and basal lip simple, straight, 
and sharp. The umbilicus is circled by a flat 
carina, of moderate width, which is variable in 
prominence. It begins above at the parieto- 
columellar lip junction, and ends at the baso- 
columellar junction by a slight angulation of 
the lip. The color of the shell is corneous yel- 
low. There is occasionally a faint, narrow band 
of white over the peripheral angulation of body 
whorl. In fresh shells the embryonic and first 
whorl are sculptured with minute, closely-set 
spiral lines, visible only at higher magnification. 
Later whorls are smooth, but not polished. The 
operculum resembles that of O. fragilis (see 
below ) . 
The size is variable, though generally uni- 
form among shells of a given lot. Occasionally 
a specimen may be nearly twice the size of the 
one figured, with, of course, a proportional in- 
crease in the number of whorls. The color also 
is variable, some lots being light brown, or with 
a brown band above and below the periphery. 
The name "Omphalotropis maritima Montrou- 
zier” seems to be a nude name, which was first 
printed in Paetel’s catalogue. However, it ac- 
companies many of the older museum lots, and 
may have given rise to the inapt trivial name 
applied to this species by Quadras and Mol- 
lendorff. 
Solem (1959’: 200) has independently rec- 
ognized that O. submaritima Quadras and Mol- 
lendorff is a junior synonym of O. granum 
Pfeiffer, and he has also included ”0. maritima 
Montrouzier” with them parenthetically. The 
O. setocincta Ancey 1890 which he recognized 
from the New Hebrides and figured (Solem, 
1959: Plate 27, figs. 8, 9) is so close to the 
specimens from Ulithi and to the cotype of O. 
submaritima which I have drawn (Fig. 14) as 
to suggest that they represent the same species. 
Omphalotropis fragilis Pease 
Hydro cena fragilis Pease I860, Proc. Zool. 
Soc. London, p. 439. Not figured. Type locality: 
Ebon, Marshall Islands. 
Dr. Cooke noted that this species also occurs 
on Fais. 
The shell (Fig. 15) is dextral, thin, translucent, 
turbinate, rimate-umbilicate. The apex is bluntly 
rounded, with the first two postapical whorls 
somewhat more convex than later whorls, which 
are only slightly, but evenly, rounded. The 
suture is prominently impressed. Periphery of 
juvenile shells (5 suture whorls) distinctly an- 
gled, and usually with a vague, linear callus, 
but this disappears on shells of maximum size 
( 6 V 4 suture whorls) which show scarcely any 
angulation of the periphery. The base is slightly 
inflated, with a carina circumscribing the small 
umbilicus, typical of the genus. Aperture ovate, 
with the columellar lip slightly reflected, and 
with an angle at the end of the omphalotropid 
circumumbilical callus, at the junction of the 
basal and columellar lips. Apical whorls are 
smooth, without sculpture. There is no sharp 
dividing line between apex and later whorls. 
The silky texture of later whorls is caused by 
numerous, minute, vague, spiral lines. These are 
evenly distributed from suture to umbilicus, but 
variable in their presence in different shells. 
Although the shell shape is remarkably con- 
stant, the color is extremely variable. Shells may 
be uniformly colored, either very light yellow 
or dark reddish-brown. Several spiral bands of 
dark brown may be present, and may be variable 
in width and number. Transverse bands of dark 
maroon, irregular and discontinuous, may occur 
