219 



form, the anterior margin produced in front of the gla- 

 bella, forming a semicircular projection about two-thirds 

 as wide as the greatest width of the glabella. Glabella 

 convex, not very prominent, the greatest breadth about 

 equal to the length forward of , the occipital furrow. 

 Anterior lobe transversely oval, twice as wide as the pos- 

 terior lobe, separated from the rest by a pair of rather 

 deep, obliquely transverse furrows, which extend about 

 four fifths across the glabella. Posterior and middle 

 furrows short, but deeply marked, not extending to the 

 margins of the glabella. Occipital furrow narrow and 

 shallow, more deeply marked in its continuation of the 

 cheek furrows. 



Eyes large, prominent, having an elevation of nine or 

 ten ranges of lenses in their greatest elevation, and thirty- 

 fi ve ranges in the other direction. Palpebral lobe depressed, 

 giving great prominence to the rim of the eye. Lobes of 

 the cheeks rather prominent, margin broad, the lateral por- 

 tions ha\ing a rounded ridge near the inner border. 



Thorax with the axial lobe moderately convex, widest at 

 the fourth and fifth segments, its greatest width not exceed- 

 ing two thirds that of the lateral lobe; the articulations 

 curve forward in the middle and at their junction with the 

 lateral lobes; the articulations of the lateral lobes marked 

 by a deep longitudinal furrow which commences on the 

 anterior margin at the junction of the axial lobe, and is 

 directed backwards, leaving the lower portion of the ar- 

 ticulation about one third of the whole width, at the mid- 

 dle of the length ; and again runs out on the upper margin, 

 where the articulation is bent abruptly .backwards. 



Pygidium broadly triangular, the anterior lateral angles 

 rounded and the lateral borders convex ; axial lobe regu- 

 larly tapering posteriorly and terminating in a slender 

 spine about half the length of the caudal shield ; marked 

 by thirteen articulations gradually decreasing in size pos- 



