GASTEROPODA. Al 
Helix pusillus, Goutp; Proceed. Boston Soc. Nat. Hist., 1. 171. 
Aug. 1846. Expedition Shells, 19. 
SHELL small, depressed, thin, rather opaque, pale green above, 
darker below, coarsely striated above, less so below, where may be 
seen, by a lens, vestiges of revolving strie. Whorls four, or a little 
less, nearly flat above, separated by a deep suture, the outer one a 
little declivous, rounded at periphery : beneath convexly rounded into 
a rather large umbilicus. Aperture oblique, circular, modified by the 
penult whorl; lip simple. 
Axis three-fortieths of an inch; diameter seven-fortieths of an inch. 
Obtained by Mr. Drayton, on the mountains of Kast Maui, Sand- 
wich Islands. 
Scarcely to be distinguished from H. electrina, Gould, in size and 
form. It is, perhaps, a little more depressed, less lucid and deep- 
coloured, and is more coarsely striated above and beneath, while H. 
electrina is polished beneath. It is also like H. spirillus, but has a 
much smaller umbilicus. The name first given is preoccupied. 
Figure 46, the shell above; 46a, profile; and 460, shell from 
below, enlarged; 46 c, natural size. 
HE.ix ziczac (Gould). 
Testa parva, rotundata, depressa, stramaneo-allida, lineolis obliquis ful- 
minantibus fuscis picta, et laminis acutis confertis, reflexis, pilosis, 
lyrata ; subtus convexa, umbilico magno scalartformi perforata: spira 
anfractibus sex convexis, angustis : apertura subcircularis, ad basim 
subangulata ; labro simplici, prope umbilicum reflexo. 
Helix ziczac, Goutp; Proceed. Boston Soc. Nat. Hist., 1. 166. 
Aug. 1846. Expedition Shells, 17. Pretrer; Monog. Helic., i. 116. 
SHELL small, rather solid, depressed, of a pale straw-colour, variega- 
ted with very numerous fine, dusky, zigzag lines, the general direction 
11 
