496 SILURIAN TRILOBITES OF NEW SOUTH WALES, vi., 



Staurocephalus, and resembles more that of tlie genus Deiphon 

 tlian it does the tail of any other trilobite known to us. 



Genus Harpes Goldfuss, 1839. 

 (Nova Acta Phys. Med. Acad. Cesarese Leop. Carol. Nat. Curios., 

 xix., Pt. ], 1839, p.3o8). 

 History. — We know of only two previous references to this 

 genus in Australia, that of de Koninck,* who gave Boree Cavern 

 as a locality for Harpe» ungiihi Sternberg, but as neither descrip- 

 tion nor figure accompany the statement, it is impossible to check 

 the determination. In 1886, one of us recorded the occurrence 

 of the genus in the liowning beds.f 



Hakpes trinuclkoidks; S]).nOV. 

 (Plate xxvii , figs. 2-5.) 



Sp. CAars. — Complete form oval. 



Cephalon approximately semicircular, and generally agreeing 

 with that of Harpes unguhi 8ternb., but always less tumid. 

 Glabella relatively small, conoid, rather parallel-sided, moder- 

 ately arched and tumid; basal pair of furrows faintly shown; 

 basal lobes bordered by sulci arching out of the axial furrows in 

 front and returning into then^ behind; neck-furrow and ring 

 weak ; cheeks moderately inflated, lower or basal half finely 

 granulated and irregularly striated, upper surface so finely gran- 

 ulated that it might be termed smooth: eyes small, almost level 

 with the front of the glabella, joined to the axial grooves by 

 narrow, shallow sulci; axial furrows distinct, anteriorly and pos- 

 teriorly interrupted by the basal glabella-lobes: limb flat, long, 

 wide, the produced horns tapering to a point, pitted and granu- 

 lated, outer margin thickened and narrow, joined to the glabella 

 and cheeks by stitch-like seams. 



Tlwrax subfusiform, depressed, smooth, or microscopically 

 granulated; greatest number of somites yet observed, twenty-two; 

 axis prominent, origin of each arch distinctly tuberculate, taper- 



* De Koninek, Fos.s. Pal. Nouv. (dalles du 8ud, Pt. i., 1876, p. 59. 



t Mitchell, Proc. Linn. Soc. N. S. Wales, i. (2nd ser.), Pt.4, 1886, p. 1199. 



X Resembling the genus Trinucltns. 



