54 THE NAUTILUS. 
Rissoa violacea Desm. 
Rissoa simplex Phil. 
Manzonia costata Ad. 
Cingula semistriata Mont. 
Cingula contorta Jeftr. 
Cingula contorta f. major. 
Setia sp.? 
Setia Benjamina Monterosato. 
Setia amabilis Mouterosato. Liv- 
ing. 
Setia mvicrometrica 
Living. 
Peringiella nitida Brus., var. 
elongata Monterosato, Very 
rare. 
Pisinna 
Seguenza. 
(= Hagenmiilleria) 
punctulum Phil. =? glabrata 
Mihlf. 
Pisinna punctulum f. elongata. 
Larger and more produced. 
Very rare. 
Pisinna (2?) seminulum Montero- 
ato. This little known species 
was found living in quantities 
with P. punctulum. 
Zippora auriscalpium Lin. 
Rissoa sp.? 
Rissoa sp.? 
Rissoa sp.? 
Hersilia Mediterranea Monteros- 
ato. Extremely rare. 
Vermetus triqueter Bivona. 
Vermetus glomeratus Lin. 
Caecum subannulatum Folin. 
Truncatella laevigata Risso. 
Skenea planorbis Fab. 
Homalogyra Fischeriana Mon- 
terosato. A single specimen 
found alive, of this extremely 
minute but beautiful little 
species. A littoral species. 
Adeor bis subcarinatus Mont. 
Crepidula unguiformis Lin. In 
the interior of a large Turbo. 
Capulus hungaricus L. Young. 
Ringicula auriculata Ménard. 
Astralium rugosum Lin. 
Phasianella (Kutropia) pulla 
Lin. 
Cyclostrema nitens Phil. 
Cyclostrema Dautzenbergianum 
Anc. New species. Shell 
very minute (diam. 1, height 
+ mill.), white, depressed, 
widely and openly umbilic- 
ated ; spire short, obtuse, con- 
vex, but little raised above the 
level of the last whorl. Whorls 
3, rapidly increasing, with 
regular and delicate arched 
costellze, the last one furnished 
besides these with three con- 
spicuous raised and revolving 
liree, the lower one below the 
periphery. Aperture sume- 
what oblique, circular, entire. 
A full description and figure 
of this delicately sculptured 
little shell will be given at 
some future time. Only two 
specimens collected. 
Another very distinct and 
also new species from Algiers 
differs from the former in lack- 
ing the riblets and in having 
a very minute spiral striation, 
both above and below. There 
are only two revolving keels 
below the middle of the last 
whorl, the lower one being 
around the umbilicus, and the 
spiral sculpture is quite con- 
Rare. 
