BY JOHN MITCHELL. 457 



No. 5, Pt. ii., 1892, pp.126, 127, PI. xxi., figs. 1-4, and PI. xxii., 

 figs. 12, 13. 



Complete form elongately oval. 



Sp. Chars. — Cephalon sub-semielliptic, smooth, only moder- 

 ately inflated, greatest length 12 mm., width between the genal 

 angles 18 mm. Glabella long, narrow, sub-bellshaped, convex 

 and prominent, highest between the anterior lateral furrows, and 

 from thence sloping to the front, which is gently rounded; lateral 

 furrows distinct, first pair short, linear and gently curved, 

 middle pair linear with a posterior curve, posterior pair wide, 

 shallow and circumscribing the basal lobes, which are relatively 

 small and suboval. Neck-furrow shallow, its lateral extensions 

 shallow. Neck-ring narrow, with a strong forward inclination, 

 its lateral extensions also narrow. Frontal border fairly wide, 

 especially at the antero-lateral angles. Facial sutures strongly 

 sinuate anteriorly, and posteriorly obliquely crossing the fixed 

 cheeks nearly in a line with the outer edge of the thorax. Axial 

 furrows deep. Fixed cheeks small. Eye-lobes small, crescentic 

 and elevated. Free cheeks relatively large, depressed, border 

 wide, space between the border and furrow beneath the eyes 

 short and steep; and immediately under the eye is a groove. 

 Eyes large, subcrescentic, very distinctly faceted, and wider 

 behind than in front. Genal angles spinate, the spines evidently 

 long. Thorax with the normal number of somites; length two- 

 thirds of the greatest width, sides subparallel, surface smooth or 

 very linely granulate. Axis prominent, rings with a distinct 

 forward inclination centrally, and showing slight indication on 

 the ridges of granulation, spread equal to one side-lobe; axial 

 furrows faint; side-lobes sloping gently from the^axial furrows 

 to the fulcra, thence sloping fairly steeply. Mesial furrows of 

 the somites distinct, and reaching to the extremities, the anterior 

 somites shorter than the posterior ones. 



Fyyidiuin sub-semielliptic, convex, greatest width nearly equal 

 to the greatest width of the thorax, and consequently just on 

 one-third greater than the thoracic length. Axis very prominent, 

 tapering gradually, and ending just within the border at half 

 the anterior width, rather prominently and rounded; annula- 



