THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE III. VOL. VII. 



No. VIII.— AUGUST, 1890. 



OZR-IO-UCsT-A-Xj ARTICLES. 



I. — On the Occurrence of the Genus Turrilepas, H. Woodw., 

 and Annelid Jaws in the Upper Silurian (? Wenlock) Rocks 

 of New South Wales. 



By R. Etheridge, jun., 



of the Australian Museum, Sydney, N. S. Wales. 



(PLATE XI.) 



THE correspondence in the life of the Wenlock rocks of Great 

 Britain and those prohably occupying a similar horizon in 

 New South Wales is a very marked one. At present, I wish more 

 particularly to draw attention to the occurrence of the genus Turri- 

 lepas and Annelid jaws in the Bowning Beds of New South Wales. 

 This series of rocks has been enthusiastically investigated by Mr. 

 John Mitchell, who, in his capacity of Teacher of the Public School 

 of that place for some years, had an excellent opportunity of work- 

 ing out the fauna of the series in question. His researches are 

 detailed in two papers, " Notes on the Geology of Bowning," 1 and 

 " The Geological Sequence of the Bowning Beds." J Both the 

 plates of Turrilepas and the small Annelid jaws are found in the 

 Lower Trilobite bed 3 of this series, and are chiefly from the typical 

 locality of Bowning Creek. 



Plates of Turrilepas. PI. XL Figs. 1-5. 



At an exhibition of some of the more characteristic of the Bown- 

 ing fossils at a meeting of the Linnean Society of New South Wales 

 held on June 29th, 1887, 4 Mr. Mitchell showed a few plates of 

 Turrilepas, as determined by myself, and this is the first record 

 of its occurrence in Australia, so far as I am aware. 



Two or perhaps three forms of plate have been obtained at 

 Bowning, including that termed by the late M. Barrande the 

 'cancellated plate ' (Figs. 4 and 5), and a specimen split in half, and 

 probably representing the entire organism, with the plates displaced 

 generally. The outline (Fig. 1) does, however, so far approximately 

 correspond with that supposed to represent a perfect Turrilepas, that 

 I think the plates may be looked upon as more or less in situ. In 

 their disunited condition they form a long, slender, sack-like body, 



1 Proc. Linn. Soc. N. S. Wales, 1887, vol. i. (2), p. 1193. 



2 Report, Austr. Assoc. Adv. Science for 1888 [1889], vol. i. p. 291. 



3 Ibid, p. 294. 



4 Proc. Linn. Soc. N. S. Wales, 1887, vol. ii. pt. 2, p. 414. 



DECADE III. — VOL. VII. NO. VIII. 22 



