494 SILURIAN TRILOBITES OF NEW SOUTH WALES, vi., 



Subsequently one of us announced the occurrence of Sphcpvexo- 

 chus mirus in the Bowning beds.* 



Sph^rexochus MIRUS Beyrich. 

 (Plate xxvi., figs. 1-5). 



S. miriis Beyrich, Ueber Bohmischen Trilobiten, 1845, p. 21, 

 Jide Salter. S. mirus Salter, Mon. Brit. Trilobites, Pt. i., 1864. 

 p. 7 6, PI. vi., fig. 6. 



Ohs. — In the Bowning and Yass specimens, we cannot detect 

 any characters by wliich they can be separated from the widely 

 distributed S. mirus; and as this fossil has already been fully 

 described by the able palaeontologists referred to above, we think 

 it unnecessary to give any further details of its specific features, 

 which may be observed in the figures of the local representative 

 fossils illustrating this paper. Mr. Johannes Nieszkowski pro- 

 posed a classification of the species known up to the time he 

 wrote, in accordance with the degree of development of the 

 glabella-furrows.f S. miriis falls within his first section, "post- 

 erior lateral furrows opening into the neck-furrow.'' 



Loc. and Hor. — Bowning Creek, Parish Bowning, County 

 Harden; Limestone Creek and DerringuUen Creek, Parish Der- 

 ringullen. County King (Mitchell): Yass and Hume beds. Par- 

 ishes Yass and Hume, County King: Middle Limestone and 

 Lower Trilobite beds of the Bowning and Yass Series. Upper 

 Silurian. 



Genus Staurocephalus Barrande. 

 (Notice preliminaire Syst. Sil. Trilobites Boheme, 1846, p. 52). 

 History. — Prof, de Koninck recorded what he believed to be 

 a Staurocephalus, from Rock Flat Creek, near Cooma § The 

 next record was by one of us. J Subsequently, Mr. F. Ratte 

 described and figured several specimens from Bowning, which he 

 compared with Staurocephalus tnurchisoui. 



* Mitchell, Proc. Linn. 8oc. N.S. Wales, i. {2nd ser.), 1886, p. 1203. 

 t Nieszkowski, Archiv Natuikunde Liv.-Ehst.-Kurland, i.(l), 1857, p. 596. 



§ De Koninck, Foss. Pal. Nouv. Galles du 8ud, Pt. i., 1876, p.47, PI. i., 

 figs. 13 and 13a. 



; Mitchell, Pioe. Linn. Soc. N. S. Wales, i. (2nd ser.), 1886, p. 1199. 



