of the Rocks associated with the Coal of Australia. 229 



in some cases to overlap each other — an appearance however 

 which may be deceptive. Length of the cup 1 inch 7 lines, 

 width about 1^ inch. 



From the soft gray shale of Darlington, N. S. Wales. 



Actinocrinus. 

 Fragments of pelvic plate of this genus occur in the Dunvegan 

 shale, and large columns apparently of Cyathocrinus are common 

 in the limestone of Wagamee, N. S. Wales, and also in the lime- 

 stone of Wollamhoola, N. S. Wales. 



CRUSTACEA. 



(Entomostraca.) 

 Bairdia curtus (M'Coy), Synop. C. L. Foss. pi. 23. fig. 6. 



This little creature is perfectly identical with those I have de- 

 scribed and figured, from the lower limestone of Kildare, in the 

 f Synopsis of the Carb. Limestone Fossils of Ireland/ 



Mr. Morris, in Count Strzelecki's work, has noticed a Bairdia 

 which he says is intermediate between my B. gracilis and B. cur- 

 tus, being more slender than the latter ; but his figure is greatly 

 more gibbose, so that I am uncertain whether his B. affinis be 

 really distinct or not. At any rate there can be no doubt with 

 regard to the present examples, which are from the shale of Dun- 

 vegan, N. S. Wales. 



Cythere impressa (M'Coy), Synop. C. L. Foss. pi. 23. fig. 16. 

 This is another species which I have described from the shales 

 at the base of the carboniferous series in Ireland, and from the 

 complexity of its form is, if possible, a still more positive iden- 

 tification than the last ; the agreement in outline, central hollow 

 and its little marginal tubercle, &c. being absolutely perfect, and 

 admitting of no doubt. It is certainly very curious to see those 

 two genera and species of minute Crustaceans occurring together 

 in the shales at the Antipodes just as we see them in our own 

 lower carboniferous beds. 



Occurs with the B. curtus in the shale of Dunvegan, N. S. 

 Wales. 



(Trilobita.) 



Brachymetopus (M'Coy), new genus. 



(Etym. /3/ra^u?, short, and fieTcairov, the forehead or glabella.) 



Gen. Char. Cephalothorax truncato-orbicular ; limb narrow, pro- 

 duced backwards into flattened spines ; glabella smooth, cylin- 

 drical or ovate, about twice as long as wide, not reaching 

 within about its own diameter of the front margin ; one pair 

 of small, basal, cephalothoracic furrows, or none. Eyes reni- 



