DESCRIPTIONS OF NKW SOUTH WALES FOSSILS ETHERITXiE. 221 



II. — An Additional Annelid Jaw from the Upper Silurian 



OF Bowning. 



(Plate xli., tig. 4). 



A particularly interesting Annelid jaw was entrusted to 

 me by Mr. John Mitchell, from the rich fossiliferous beds of 

 Bowniug. It is quite distinct from any of those hitherto 

 described from Australian strata, and adds a further genus of 

 Errant Annelids to the Australian list. 



In 1879 Dr. G. H. Hinde proposed the genus Staurocephalites 

 for " jaws of more or less elongated, compressed, denticulate 

 plates, resembling those of the existing genus Stmirocephalus, 

 Grube."^ Dr. Hinde's likened-name is particularly unfortunate 

 because Stuiirocephalus, Grube, 1853, was antedated as a genus 

 of Trilobites by Barrande at least nine years before, in 1846. 

 However, there the name is, and as Staurocephalites must be 

 used. 



The little jaws for which Dr. Hinde proposed this name are 

 ribbon-like, and may be best compared to a fret-saw blade. 



The two Bowning jaw-plates are linear, long, flattened, 

 nari'ow, particularly delicate and black in colour, both about 

 six millimetres in length. The slightly longer of the two 

 has about twenty-six teeth, the shorter about twenty- 

 two. These teeth are exceedingly minute, acicular, separate 

 from one another, not inclined, but at right angles to the 

 ribbon itself, and of uniform size; the height varies from 

 0.21-0.27 mm. 



These minute objects are quite distinct from both of Hinde's 

 species, S. 7iiagare)tsis^ and S. serrida,^^ in that they are (if 

 perfect) uniformly linear, and no evidence of narrowing from 

 before backwards. They are also acicular-toothed instead of 

 triangular as in S. niagarensis, or short and rounded like those 

 of S. serrida. 



It is proposed to terra this form Staurocephalites granimoidesA^ 



« Hinde— Quart. Jour. Geol. Soc, xxxv., 1879, p. 383. 

 '■' Hinde— Loc. cit., xxxv., 1879, p. 383, pi. xx., fig. 1. 

 I" Rinde— Lor. cit., xxxvi., 1880, p, :i76, pi. xiv., figs. 18-20. 

 ' ' ypafXfLij — a line. 



