544 STUDIES ON AUSTRALIAN MOLLUSCA, IX., 



JoANNisiELLA sPHiERicuLA Deshayes. 

 (Plate xxxii.. figs.18, 19, 20, 21.) 



A small bivalve from the Parramatta River was recorded and 

 described by G. F. Angas * under the name of Mysia sphcericula 

 or Diplodonta sphcericula Deshayes. He did not as usual quote 

 a reference, and apparent^ regarded the name as an unpublished 

 one. 



Subsequent authors who referred to this species and failed to 

 trace the name to its source are, Try on, f Tapparone Canefri % 

 and Pritchard and Gatliff.g The latter, who extended the range 

 of the shell to Victoria, indeed substituted Angas for Deshayes 

 as the author of the species. Though Deshayes never described 

 a Diplodonta under this title, it is obvious that his Cyrenella 

 sphceincida || from Moreton Bay, Queensland, was based on the 

 species under discussion. 



The thin swollen shell, epidermis and other characters, do not 

 suit the usual classification of this in Diplodonta, but appear to 

 claim for it admittance to a genus Joatmisiella, proposed by Dall^ 

 for an Oriental group, typified by Cyrenoida oblonga Hanley.** 



As this species has not yet been illustrated, I add drawings of 

 a specimen from Sydney Harbour, 18mm. long and 16mm. high. 



Philobrya parallelogramma, n.sp. 



(Plate xxxii., figs. 14, 15, 16.) 



Shell rather large for the genus, solid, considerably inflated, 

 very inequilateral; in outline the younger shells are nearly square^ 

 but the older approach a parallelogram. Colour white. Sculp- 

 ture : seventeen strong radiating ribs which undulate the margin; 

 a concentric system develops cross-bars in the furrows and 



*Proc. Zool. Soc, 1867, p. 927. 



tProc. Acad. Nat Sci. Philad. 1872, p.95. 



Ij: Acad. R. Sc. Torino (2) xxviii., 1873, p. 2.38. 



§Proc. Roy. Soc. Vict. (2j xvii., 1904, p.224. 



II Deshayes, Proc. Zool. Soc, 1854 (1855), p.340. 



•i Nautilus ix., 1895, p.78. 

 •* Hanley, Recent Shells, 1844, pi. xv., fig 6. 



