14 MR. FREDERICK CHAPMAN ON THE 



shown its identity with Brady's figure referred to above, by the external form, 

 the shape o£ the aperture, the thickness of the shell-wall, and especially in the 

 internal arrangement of the chambers so well illustrated by the median slices 

 of the test. Our specimens agree with the above species both in external 

 form and internal plan. Schlumberger's specimens were obtained from the 

 Gulf of Gascony at a depth of 1850 metres. 

 Occurrence. — Grice's Creek, somewhat rare. 



BiLOCULiNA Sarsi, Sclilumherger. (Plate 1. figs. 1, 2.) 



Biloculina Sarsi, Sclalumberger, 1891, M^m. Soc. Zool. France, vol. iv. p. 553, pi. 9. 

 figs. 55-59, woodcuts figs. 10-12. 



At first sight this form might be confused with B. depressa. It differs, 

 however, from that species in the relatively thicker test and less salient 

 carina. Internally, the form A in B. Sarsi possesses a thick- walled canal-like 

 chamber following the megalosphere or large initial cell ; whilst in form B 

 the quinqueloculine chambers of the initial portion are not so strongly carinate 

 as in B. depressa. The specimens examined at present from the Australian 

 localities appear all to belong to form A. 



Schlumberger recorded the above species from the BilocuUna-Claj of the 

 North Sea at 2000 fathoms. 



There is very little doubt that d'Orbigny's B. lunida from the Vienna Basin 

 is closely related to, if not identical with, the above species. 



Occurrence. — This species is fairly common in the present collection. It 

 occurs at Grice's Creek, Balcombe's Bay, and Altona Bay Coal-Shaft. 



Biloculina depressa, d'OrUgny. (Plate 1. fig. 16.) 



Biloculina depressa, d'Orbigny, 1826, Ann. Sci. Nat. vol. vii. p. 298, No. 7 ; Brady, 1884, 

 Rep. Chall. vol. ix. p. 145, pi. 2. figs. 12, 16, 17, pi. 3. figs. 1, 2 ; Howchin, 1889, Trans. R. 

 Soc, S. Australia, vol. xii. p. 1 ; Schlumberger, 1891, Mem. Soc. Zool. France, vol. iv. 

 p. 547, pi. 9. figs. 48, 49, woodcuts figs. 1-5. 



The majority of the specimens show a tendency to develop an aboral 

 prolongation of the peripheral flange, as noticed also by Howchin, who 

 recorded this species from both the Lower and Upper beds of Muddy Creek. 



Occurrence. — B. depressa is not at all common in our samples and is perhaps 

 below the average in point of size. It occurs at Grice's Creek, Kackeraboite 

 Creek, and Altona Bay Coal-Shaft. 



Biloculina l^evis, Defrance sp. (Plate 1. fig. 15.) 



Pyrgo IcBvis, Defrance, 1824, Diet. Sci, Nat. vol. xxxii, p. 273, Atlas, pi. 80. fig. 2. 

 Biloculina Icevis, Defrance sp., Goes, 1894, Kongl. Svenska Vetenskaps-Akad. Handlingar, 

 vol. XXV. p. 119, pi. 24. figs. 914-918. 



This species is somewhat similar to B. depressa in its general shape, but is 

 (lir:*tinguished by its bicarinate periphery. It inhabits deep and shallow water 



