44 MOLLUSCA. 
acute, slightly developed angle. Beneath convexly rounded, with a 
small, rather deep umbilical pit. Aperture lunate, lip simple, very 
slightly reflexed at its central junction. 
Diameter one-fourth of an inch; axis three-twentieths of an inch. 
Inhabits the mountains of Hawaii. Drayton, Brackenridge. 
Its general aspect is that of H. swbrutila, Mighels, but it is more 
elevated, more opaque, less fragile, the incremental lines are coarser, 
with a few revolving lines; the periphery is more rounded and less 
carinated. ‘The whorls are more convex, with a deeper suture, and 
the lip is less spread over the umbilical pit. The colour is of a more 
pale pea-green. Beneath, the whorl is much more rounded, the um- 
bilical pit is deeper, and there is no semblance of a columellar twist. 
Figure 73, the shell above ; 73 a, the side; and 73 8, the base of the 
shell, enlarged ; 73 c, natural size. 
HeLix cryproportica (Gould). 
Testa parva, orliculari-depressa, ad apicem acuta, tenuis, pellucida, 
nitida, luteo-virescens, leviter striata ; infra rotundata, imperforata ; 
fovea central parva: spira anfractibus quinque cum dimidio convext- 
usculis, ultimo carinato; suturad impressa, marginata: apertura 
lunata, labro simplict ; columella superné admodum intortd, sinum 
centrulem angustum reconditum formante. 
Helix cryptoportica, Gout; Proceed. Boston Soc. Nat. Hist., ii. 
171. Sept. 1846. Expedition Shells, 20. Pretrrer; Monog. Helic. 
Viv., i. 39. 
SHELL small, depressed, thin, pellucid, shining, of a pale yellowish- 
green colour, delicately striated : spire depressed, apex acute, composed 
of five or more rather convex whorls, with a well-defined, margined 
suture, and the outer whorl with a delicate, acute keel. Beneath, con- 
vexly rounded, with a small, shallow, central pit. Aperture lunate, 
lip simple, columellar portion oblique, and at its superior junction it 
