498 SILURIAN TRILOBITES OF NEW SOUTH AVALES, vi., 



BOUNYONGIA BOWNINGENSIS, sp.UOV. 



(Plate xxvi., figs. 12, 13.; Plate xxvii., fig U.) 



AVhole form unknown, 



Var. Chars. — Cephalon sub-oblong, moderately inflated, very 

 finely granulated with large tubercles sparsely and regularly dis- 

 tributed, approximately half as long as wide; glabella moderately 

 inflated, highest medially, sloping rapidly anteriorly, less so 

 posteriorly; axial grooves shallow, indistinct; neck-furrow in- 

 definite; ueck-ring narrow and indefinite, but subtuberculate at 

 the bases; fixed cheeks large, rather flat, false lateral lobes, and 

 furrows indistinct; ocular ridges and palpebral furrows present; 

 genal spines long and falcate; free cheeks small, ankylosed to 

 the fixed cheek ; eyes small, slightly pedunculate, obliquely 

 directed outwards, and overhanging the free cheeks. 



Thorax unknown in the complete state; axis slightly arched 

 transversely and longitudinally, bases of rings tuberculate and 

 joint-like; axial furrows shallow and wide; pleur?e flat, about 

 half as wide as the axis, finely granulate, each pleura bearing, 

 on its inner posterior angle, a prominent tubercle adjacent to the 

 axial groove, and another at the distal end; apparently bispinate, 

 spines themselves also spinate. 



Pygidium unknown. 



Obs. - This is a rare trilobite apparently, as only two f rag- 

 mental specimens are known. The glabella and lobes, or false 

 lobes, resemble those of Ceratocephala lon(jis}>iua\ but here the 

 resemblance between them ceases, and to no other known to us 

 does the cephalon bear any marked likeness. In the possession 

 of articular-like bases to the axial rings, and the wide, flat, 

 tuberculate pleural segments and barbed spines, this new type 

 bears a strong resemblance to C. vogdesi: but the cephalon is 

 quite diff'erent. It is unnecessary to compare it with any other 

 Odontopleurid that has come under our notice. 



Loc. and i/or. — Bowning Creek, Parish Bowning, Count}' 

 Harden: Lower Trilobite bed, Bowning Series (Yass and Hume 

 beds). Upper Silurian. 



