270 



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. and XXI. 



Cyclostrema (Daronia) jaffaensis, n. sp. 



P]. 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, I'G mm.; 

 width of aperture, 1 mm. 



Locality. — 90 fathoms off Cape Jaffa, 2 good, dead. 



Ohs. — The genus is provisional. TJaronia (A. Adams), a 

 planorbiform section, corresponds, but for the continuity of 

 its peristome. 



Xenophora tatei, Harris. 



Xenophora (TuguriumJ tatei, Harris, Brit. Mus. Cat. Tert. 

 Moll., Austr.. vol. i., 1897, p. 254, pi. vii., figs. 7a and 7b. 



Hedley, Memoirs Austr. Hue., "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 

 Timbilicus and much more valid and very regular radial lirse 



