Victorian Fossils, Part XIII. 183 



of carbonate of lime is very small, being 6.68 per cent., whilst 

 the phosphate of lime is 42.29 per cent., and the organic matter 

 45.2 per centA It is therefore probable that the testaceous or 

 calcareous layer is a phosphatised carbonate of lime, somewhat 

 of the nature and composition of a crustacean carapace. My 

 colleague, Mr. R. H. Walcott, F.G.S., has kindly tested this 

 fossil shell, and obtained a decided reaction for phosphoric acid. 



Descrijjtion and Details of the Parasitic Fungus Previously 



Joted. 



Tubes of thallus .02 mm. in diameter, filled with dark fer- 

 ruginous matter, occasionally branched, and sometimes bearing 

 a globular sporangium. Thallus either as single wandering cells 

 or densely matted (see Plate XLV., fig. 6). 



The branching thallus penetrates the shell between the horny 

 layers. It may be provisionally referred to as Palaeachlya cf. 

 tortuosa, Etheridge fil., a parasitic form described by Mr. R. 

 Etheridge, jnr., from a Queensland carbopermian monticuli- 

 porid,"^ which has tortuous tubes with a diameter of .02 mm., 

 and which exactly coincides with that of the present form. 

 Another species, P. torquis, was described by the same author"' 

 from devonian corals (Favosites) of the Tamworth District, 

 New South Wales ; but this differs in having a more freely 

 growing thallus, with slenderer tubes, of only half the diameter 

 (.01 mm.). 



Lingula cf. striata, J. de C. Sowerby. (PI. XLV., Fig. 7). 



(?) Lingula striata, J. deC. Sowerby, 1839, in Murchison's Silu- 

 rian System, pt. II., p. 619, pi. VIII., fig 12. Lingula striata, 

 Sow., Murchison, 1859, Siluria, p. 543, pi. XX., fig. 7. David- 

 son, 1886, Mon. Brit. Sil. Brach. (Pal. Soc), p. 45, pi. III., figs. 

 45-48. This is a nearly perfect brachial valve, occurring in the 

 blue mudstone of South Yarra, which in its sub-oval form, with 

 squarish anterior margin, and distant, regular growth-lines or 



1 Gratiolet, op. cit., p. 62. 



1 Rec. Geol. Sui-v. N.S. Wales, vol. ii. 1891, p. n.'i, pi. vii., fii^. 1. 



2 Rec. Austr. Mus., vol. iii., No. .^, 1899, p. 1-21. i>l. xxiii., fig. n. 



