BY R. ETHEKIDGE, JUNK., AND JOHN MITCHELL. 489 



know what this fossil was, but possibly that now dealt with as 

 Crot.alocephalus At any rate, it was no doubt intended as a 

 name in honour of Sir Terence Aubrey Murray, Speaker of the 

 Legislative Assembly in 1860-61, and President of the Legis- 

 lative Council in 1862. 



Next on the scene, we have Prof. L. G. de Koninck, who 

 referred a pygidium from Yarralumla to Cheirnrus iiisignis 

 Bey rich.* The nearly perfect cephalon, imperfect glabella, and 

 thoracic fragment termed Cheirurufi iiisiyiiis, by Mr. C. Jenkins, 

 from his Hume beds of the Yass River,! are in all prol>abilitv 

 referable to the form herein described as C rotalocephalus . Next 

 in order, one of us (J. Mitchell) referred to the occurrence of 

 Cheiruriis \i\lhQ Bowning beds. ; In 1900, R. Etheridge figured 

 a fragmentary glabella from Cooper's Creek, Walhalla, Victoria, 

 after the type of C rotalocephalus yibbus Barrande, thus indicat- 

 ing the presence of this section of the genus in Australian rocks § 

 In 1908, Mr. F. Chapman referred to two pygidia from the 

 Silurian of Dolodrook River, North Gippsland.|| Again, in 1915, 

 the same author recorded the presence of Cheirurus sternberyi 

 fiom Ruddock's Quarry, near Lilydalt^, Victoria.^ This concludes 

 the history of Cheirurus in Australia, as far as known to us. 

 The repeated reference to Cheii^iim.s insiyiiis is remarkable, 

 because our New South Wales Cherrvriis is perfectly distinct 

 from that species, and appertains to an entirely different .section 

 of the genus. It must be admitted, however, that some of our 

 pygidia bear a strong resemblance to the pygidium of that species. 



* De Koninck, Foss. Pal. Nouv. Clalle.s du Sud, Pt. i., 1S76, p. 48. 

 t Jenkins, Pioc. Linn. Soc. N. 8. Wale.s, iii., Pt.8, 1878, p.217, PI. 6, tio-.8. 

 ■^ Mitchell, Proc. Linn. Soc. N. S. Wales, i., (2nd ser.), 1886, p. 1199. 

 § Etheridge, Geol. Survey Vict., Monthly Progress Reports, No. 11, 

 19<XJ, p. 23. 



1 Chapman, Proc. Roy. Soc. Vict., xxi. (N.S.), 1908, p.269. 

 11 Chapman, Proc. Roj\ Soc. Vict., xxviii. (N.S. ), 191"), pp. 1H7-8. Un- 

 fortunately this paper of Mr. Chapman's did not come under our notice 

 until after we had completed our paper. 



