
270 
[From “Transactions of the Royal Society of South Australia,” 
vol. raxaxiii., 1909.) 
NOTES ON SOUTH AUSTRALIAN MARINE MOLLUSCA, 
WITH DESCRIPTIONS OF NEW SPECIES.—PART X. 
By Jos. C. Verco, M.D. (Lond.), F.R.C.S. 
[Read June 1, 1909.] 
PLATES XX. ann XXII. 
‘Cyctestrema (Daronia) jaffaensis, n. sp. W/. ip 
Pl. xx., figs. 6 and 7. 
Shell small, concentrically coiled. Whorls two, convex, 
uniformly increasing. Suture distinct, impressed. Aperture 
reniform ; only a thin glaze over the preceding whorl ; borders 
simple, thin, at the sides concavely retrocurrent near 
the suture, then convexly antecurrent, and in front barely 
concave. Umbilicus very wide and perspective, showing all 
the whorls: the sunken spire is similar, but not quite so deep 
or steep. Both depressions are bounded by a minute angula- 
tion or carinating cord, which winds round the whorl, gradu- 
ally approaching the suture until it is lost in the depression 
at the beginning of the penultimate whorl. 
Dim.—Largest diameter, 2 mm.: smallest, 16 mm. ; 
width of aperture, 1 mm. 
Locality. —90 fathoms oft Cape Jaffa, 2 good, dead. 
Obs.—The genus is provisional. Daronia (A. Adams), a 
planorbiform section, corresponds, but for the continuity of 
its peristome. 
Xenophora tatei, Harris. 
Xenophora (Tuguriwm) tatei, Harris, Brit. Mus. Cat. Tert. 
Moll., Austr., vol. i., 1897, p. 254, pl. vii., figs. 7a and 7b. 
Hedley, Memoirs Austr. Mus., ‘Thetis Results,” 1903, p. 
357. ‘A broken shell, 30 mm. in diameter, and apparently _half- 
grown; corresponds with actual fossil shells from Muddy Creek, 
with which I have compared it.’ 
Four were dredged dead in 15 to 20 fathoms in Petrel Bay, 
St. Francis Island; 17°5 mm. in diameter, exclusive of accre- 
tions. They were submitted to Mr. Hedley, who wrote :— 
“For the purpose of this note I have again scrutinized both 
a Muddy Creek fossil and the New South Wales series of 
recent shells, and I see no difference.’ By courtesy of Mr. 
Howchin I have compared it with the fossils in the Tate 
Museum of the University of Adelaide. These are much 
larger when full-grown, and show a comparatively larger 
umbilicus and much more valid and very regular radial lire 


