241 
ordinate groups, but at any rate it appears in at least two of 
them ; thus, R. spirata is a Morchiella among Rissoina (s.s.), 
and Rk. Antoni among Phosinella, and though I have not observed 
the total extinction of the ornament of the younger part of the 
spire on the body-whor! in other groups, yet the tendency thereto 
is shown by some species in each. On these grounds, Morchiella 
should be rejected. 
Distribution.—In South Australia I have taken it at many 
localities throughout its coast-line, from the Great Australian 
Bight to Cape Northumberland. [ have examined examples 
from Victoria and Tasmania. It is reported from New South 
Wales and North Australia. Occurs in New Caledonia (as BR. 
Montrouziert), &c., to Indian Ocean and Gulf of Suez. 
SECTION PHOSINELLA. 
Rissoina Hedleyi, spec. nov. PI. vii., fig. 8. 
Solid, translucent - white, conically turrited. Whorls five 
(protoconch not known), moderately convex, suture impressed ; 
ornamented by subacute axial ribs, much narrower than the con- 
cave interspaces, crenated by spiral sulcations and their inter- 
vening riblets, both axial and spiral ribs increase in number with 
the growth of the shell, the spiral riblets are absent on the first 
whorl, four on the next, six on the penultimate, and ten on the 
body-whorl, Aperture oblique, roundly elliptic; outer lip 
arched, thickly varicosed and crenated on the outer margin; 
inner lip arched, produced anteriorly; the basal funiculus 
nodulose-dentate, and truncated by the deep basal sinus. 
Length, 4°25; width, 2 mills. 
Fowler Bay, South Australia (R. Tate, 1879); and Port Wes- 
tern, Victoria (received from Dr. Pulleine). 
From the reproduced figure and description given by Tryon, 
Man. Conch., of &. Samoensis, Dunker, in Kuster, Conch. Cab., 
t. 15c, f. 1, this new species must be closely related to it; the 
observable differences are that the Samoan shell has three spiral 
riblets on the antepenultimate, four on the penultimate, and 
seven on the body-whorl; whereas the South Australian shell 
has correspondingly four, six, and ten; and, moreover, the axial 
ribs are much wider apart. The species-name is in compliment 
to Australia’s chief malacologist. | 
Rissoina semiseulpta, spec. nov. PI. vii., fig. 10. 
Shell solid, translucent, conic-turrited; whorls five (apex 
deficient); gradated, separated by a depressed canaliculate suture; 
posterior whorls ornamented by axial, subacute plications, and 
three revolving riblets, which cut up the plications into somewhat 
nodulose crenatures. 
