BY R. ETHERIDGB, JUNE., AND JOHN MITCHELL. 697 



pair of glabella groovesj aiiterioi* pair absent; glabella grooves 

 wide and distinct and Joining the axial and false furrows; axial 

 furrow faint anteriorly but distinct posteriorly; false furrows 

 very distinct and wide. Fixed cheeks of moderate size; genal 

 lobe subtriangular, very tumid, granulated; ocular bands or ridges 

 very narrow and partly overhung by the genal lobes, and themselves 

 intensely overhanging the free cheeks and bearing a distinct row of 

 granules ; genal or palpebral furrows distinct ; eyelobes small, 

 triangular areas very small. Free cheeks of tolerable proportionate 

 size, intensely tumid, borders intensely thickened, particularly 

 towards the genal angles, each bearing twelve short, acicular, 

 deflected spines exclusive of the genal spines, marginal furrow 

 very distinct. Genal spines short, stout, falcate, and forming- 

 obtuse angles with the cephaion. Facial sutures anteriorly appear 

 to be soldei'ed, but their course is indicated along and under the 

 ocular ridges, and they incline towards each other at an angle of 

 35°, cutting the front mai'gin in a line with the axial furrows; 

 posteriorly they run obliquely to the median point of the lateral 

 extensions of the fixed cheeks, thence parallel with those exten- 

 sions to the genal angles. Occipital fun^ow wide and shallow 

 centrally, but deep at the sides, continuing across the sides dis- 

 tinctly and joining the marginal furrows of the free cheeks. Neck 

 or occipital ring strongly arched vertically, only moderately so 

 backwards, sides nodular, no central tubercle. Eyes prominent, 

 as high as the highest part of the central glabella lobe, small, 

 very wide apart, the distance between them being equal to twice 

 the length of the cephaion. 



Thorax. — Consists of ten segments, width equal to the combined 

 length of itself and pygidium, granulated. Axis prominent, 

 rather wider than the pleurae, posterior width half of the anterior 

 width, rings nodular at the sides. Pleune flat between the axial 

 grooves and the fulcra, thence short and sharply deflected, sutures 

 distinct, median ridges prominent, tuberculated, one very pro- 

 minent tubercle on each ridge nearer the fulcra than the axial 

 grooves, forming a longitudinal row along each lateral lobe; ends 

 of pleurse or median ridges thickened and bispinate, posterior 



