6o 



JOHAN KIÆR. 



M.-N. Kl. 



■Uié.y' 



Fig. 8. Hohiiia Kjerulf] Lnrs. Reconstruction double 



natural size of a small specimen and a length profile 



showing the spines. 



The form o f t h e b o d y 

 is distinguished by a broad 

 almost semicircular crani- 

 dium, that posteriorly ex- 

 tends as two long, narrow, 

 r,.--A _ .«-5 -r '^ — I ^^B faintly bent genal spines, a 



' '^», "^ I - ^B narrow, elongated thorax 



consisting of i6 uniformly 

 developed segments, and a 

 small pygidium shaped like 

 a patch. See PI. Mil and text- 

 figures 8 — 9. The C r a n i d i- 

 um, as mentioned above, con- 

 veys the impression of being 

 almost semicircular, although 

 the length is alwa^-s some- 

 what greater than half the 

 breadth. In the case of quite 

 young cranidia the anterior margin is usually quite even and broadly rounded, 

 whilst in older specimens it is somewhat extended, and in consequence 

 slightly pointed. (Cfr. fig. 5, 7 & 11, pi. VIl. The Glabella is comparatively 



narrow, but increases some- 

 what in breadth with age, 

 The occipital segment and 

 the posterior lobes are con- 

 siderably narrower than the 

 length of the cranidium; the 

 ist and 2nd lobes increase 

 in breadth so that they are 

 broader than half the length 

 of the cranidium. The ist 

 1 o b e (FrontalLobe) is broad!}- 

 rounded, has originally been 

 somewhat sharply arched, 

 (text-fig. loi, and extends 

 so far forward towards the 

 anterior margin that only a 

 narrow rim is left. The 

 frontal lobe continues poste- 

 riorly on both sides as the 

 markedly arched palpebral 



Fig. 9. Holuiid Kjcnilfi Lnrs. Reconstruction natural 

 size of an older specimen. 



