1 64 Frederick Chapman : 



C. bovmingensis, above mentioned, is also clearly related to 

 G. megalops in possessing a thoracic spine, but differing in many 

 details, such as the longer glabella and more depressed carapace. 



In its tapering extremity, G. lilydalensis resembles the Lower Hel- 

 derbergian species, G. coelebs, Hall and Clarke; 1 a form remark- 

 able for its very long genal spines. 



Horizon and Occurrence. — Silurian (Yeringian). Wilson's 

 quarry, near Lilydale. Coll. by Mr. R. H. Annear. 



Cyphaspis yassensis, Etheridge fil. and Mitchell. (Plate XIV., Fig. 7 . 

 Plate XVI., Pigs. 20, 21). 



Gyphaspis yassensis, Etheridge fil. and Mitchell, 1894, Pine 

 Linn. Soc. N.S. Wales, vol. VIII. 2nd ser., p. 172, pi. VI., tigs. 

 1, la-d. 



Observations. — The Victorian specimens agree in all particulars 

 with those described from the Lower Trilobite bed of the Bowning 

 series between Bowning and Yass, N.S. Wales. Their occurrence in 

 these Yeringian beds seems to point to the view that the whole of the 

 Bowning series may be stratigraphically not lower than the Newer 

 Silurian of Victoria. 



As remarked by Messrs. Etheridge and Mitchell, the large size of 

 the pygidium in this species points to a relationship with Proetus. 

 The Victorian specimens show the same peculiar, supposed auditory 

 organs first noticed in this genus by those authors. 



Horizon and Occurrence. — Silurian (Yeringian). In yellow, 

 micaceous mudstone (topmost bed), Wombat Creek, a tributary of 

 the Mitta Mitta River, N.E. Gippsland. The remains are fairly 

 common. Coll. Geol. Surv. Vict. (W. H. Ferguson). 



Also a pygidium probably referable to this species from the 

 junction of the Woori Yallock and Yarra; Geol. Surv. Vict. CB23). 



Portion of a cranidium (associated with Orthis testudinaria) ; 

 G.lenburnie Road. Whittlesea. Presented by Mr. J. T. Jutson. 



Fam. Calymbnidae, Milne Edwards. 

 Genus Calymene, Brongniart. 

 Calymene angnstior, sp. nov. (Plate XV., Figs. 8-10). • 

 Description. — Body, long ovate. 



Cephalon semi-circular, more than one-third the total Length. 

 The glabella comparatively narrow and high, and the width less 



trol. vii., 1888, p. 151, pi, xxiv., tin'. 



