100 NOTE ON SOME TRILOBITES NEW TO AUSTRALIA, 



which I have ah-eady spoken, is broader than in A. Leonhardi. It 

 would therefore come nearer to A. Dorniitzeri on that account, 

 but, as I have already said (p. 98), although Bai-rande does not 

 describe the head of the last species on the ground of its similarity 

 to that of the former, still he does not represent the frontal 

 margin of A. Dormitzeri with the granulation which exists in A. 

 Leonhardi. These three specimens might belong to two or even 

 three different species. 



One of the specimens being very well preserved, as regards the 

 granulation of the glabella, I have represented it increased four 

 times, viz., twice as much as the others, in order to show more 

 exactly all the details. 



Staurocephalus near S. Murchisoni, Bai-r. 



Barrande, Sil. Syst. p. 812, pi. 43; Salter, Brit. Trilob. p. 84, 



pi. 7. 



(Plate II., figs. 5-9.) 



This genus was recorded from Australia, for the first time, 

 by Prof, de Koninck, (in his Fossiles Paleozoiques Nouv.-Galles du 

 Sud, 1876, p. 47, pi. 1, fig. 8), when he dedicated to the late Rev. 

 W. B. Clarke, a beautiful species from Rock Flat Creek (Monaro), 

 whence the doubtful Lichas 2)abnata which is spoken of by de 

 Koninck, also comes. 



The specimens of Staitrocejihalus I am about to record and repre- 

 sent here are from Bowning, and have already been referred to in 

 the Proceedings by M. Mitchell under the name of S. Murchisoni ; 

 but he acknowledges himself that they do not perfectly agree with 

 the representations of this fossil by Salter and Barrande. 



Out of the five specimens, three show only the head, not unlike 

 that of aS*. Murchisoni ; another specimen is a hollow cast of the 

 head and pleurae (fig. 5) ; and the last, which is nearly complete, 

 has been recently handed to me by Mr. Mitchell (fig. 6). 



I do not see any remarkable diflference between the heads repre- 

 sented in our figures, and fig. 28 of Barrande's plate 43, except that 



