lonAX KIÆR M.-X. KL 



inner branch of the palpebral lobe continues without limits to the posterior 

 genal lobes of the frontal lobe. 



The space between the palpebral lobes and the glabella is quite flat 

 and level. 



The Outer Cheeks are comparatively narrow, with a distinct but faint 

 raised rim along the outer margin; this rim is broad, occupying almost 

 one half of the breadth of the cheek. It increases in breadth posteriori}-, 

 and passes into the posterior rim along the back of the cranidium. 



The Posterior Margin of the Cranidium at first proceeds almost 

 straight out to the powerful intcrgenal spines that lie nearer to the dorsal 

 furrow than the genal spines, and then bends somewhat sharply forwards to 

 the genal spines, which are very narrow and long, faintly bent inwardly; 

 they reach almost to the 4th segment. 



Distinct ribs run from the intergenal spines in a slightly arched course 

 inwards towards the glabella which they reach at the posterior margin of 

 the 4th lobe. 



On the Under Side of the Cranidium the shell bends in a narrow 

 doublure; it is extremely narrow in front, but increases in breadth posteriorly 

 and there passes into a doublure along the posterior margin that narows in- 

 wardly. 



To this fold there is attached the hypos to me with its long hypo- 

 stome attachements; a distinct suture separates them and we often see 

 the hypostome with its hypostome attachments isolated. 



TheHypostome as a rule is markedly deformed by pressure, b}' which 

 in particular the posterior portion is greatly pressed upwards in proportion 

 to the anterior part; see pi. \'1I, hg.s 4 — 5 where fig. 4 shows a well 

 preserved h3'postome that has undergone the usual pressure, fig. 5 one that 

 is almost unpressed. It is markedly arched, particularly the anterior section 

 that merges imperceptibly into the whole of the anterior wings. The posterior 

 section is crescent-shaped and in an unpressed condition indistinctly sepa- 

 rated from the anterior; as a rule the medial furrow has become more 

 marked by pressure. It is bordered posteriorly and laterally by a narrow 

 rim that also appears prominently on the compressed specimens. The h3-po- 

 stome is comparatively elongated with a somewhat narrow and long projec- 

 ting posterior portion which embi'aces the posterior lobe with its distinct 

 maculae. This posterior portion merges into 4 short spines, and then has 

 a pentagonal outline. The posterior wings could not be determined. I he 

 anterior section and the anterior wings are immoveabh' attached to the hypo- 

 stome attachments in front; the boundary is indicated by a fine, raised line. 



