136 F. CHAPMAN ON RECENT FORAMINIFERA OF VICTORIA : 



Discorbina dimidiata, Jones & Parker. 



(PI. 10, Figs. 8, a, b.) 



D. dimidiata, Jones & Parker, 1862, in Carpenter, Parker, &, 

 Jones' Introd. Foram., p. 201, fig. xxxii. b ; Parker & Jones, 

 1865, Phil. Trans., vol. civ., pp. 385, 422, pi. xix., figs. 9, a — c. 



This peculiarly Australian species, regarded by Parker and Jones 

 as a sharp-edged, inferiorly concave modification of D. vesicidaris, 

 is one of the most abundant of the shore-sand Foraminifera on 

 the southern coast. The test is of a reddish brown colour, and 

 darker in the apical region. By its more turgid form and coarsely 

 perforated shell-wall we can easily distinguish it from D. rosacea, 

 d'Orb. The original locality is shore-sand near Melbourne ; and 

 Howchin records it from the north arm of the Port Adelaide 

 River. 



A.B., very common ; B., very common ; M.H., very common ; 

 P.N. ; Sh., common ; T., common. 



Discorbina rugosa, d'Orbigny sp. 



Rosalina rugosa, d'Orbigny, 1843, Amer. Merid. Foram., p. 42, 

 pi. ii., figs. 12 — 14. 

 Sh., rare. 



Discorbina biconcava, Jones & Parker. 



D. biconcava, Jones & Parker, 1862, in Carpenter's Introd. Foram., 

 p. 201, fig. xxxii. g ; Parker & Jones, 1865, Phil. Trans., 

 vol. civ., pp. 385, 422, pi. xix., figs. 10, a — c. 



This species is interesting from the fact that it occurs almost 

 exclusively around the Australian coast, having been found off 

 East Moncoeur Island, Bass Straits, Storm Bay, Tasmania, and 

 Paine Island, Torres Straits. It has also been recorded from 

 shore-sand near Melbourne by Parker and Jones. The only 

 exception to the Australian localities for this species seems to 

 be that given by J. D. Siddall, who found it in the estuary of 

 the Dee. 



M.H., rare; T., frequent. 



Discorbina rarescens, Brady. 

 D. rarescens, Brady, 1884, Rep. Ghall., vol. ix., p. 651, pi. xc, 

 figs. 2—4. 

 T., very rare. 



