1916. No. lo 



THE LOWER CAMBRIAN HOLMIA FAUXA. 



39 



The occipital Furrow is very marked and broad, and appears to be deeper 

 according to age. 



The occipital segment is comparatively narrow and is not e.xtended 

 backwards. 



The Glabella is not limited by distinct dorsal furrows. 



The fixed cheeks are narrower than the posterior part of the glabella 

 and bends downwards in a gentle arc. The palpebral 1 ob es commence 

 by the posterior marginal furrows of the cranidium, the latter being well 

 marked and increase in breadth outwards, stretching in a rather strong arc 

 forwards until they attain the same height as the 3rd pair of furrows of the 

 glabella. A comparatively well limited eyebrim runs from this point inwards 

 towards the central part of the foremost lobe of the glabella, without 

 however, reaching the latter. 



In front of the eye-brims and the glabella there runs a shallow and 

 comparatively narrow impression, — arched or slightl}' angular — across the 

 cranidium, limiting a faint, arched, frontal brim. The anterior margin 

 proceeds almost parallel with this impression, and the frontal brim for that 

 reason does not acquire a triangular outline as in the preceding species. 



The sculpture consist of fine, impressed points. 



Dimensions: The dimensions and proportions of the Cranidium 

 will be seen in the following table. As is evident, the species attains to 

 a more considerable size than Stroiurlla primaeva Brøgger. Amongst the 

 specimens measured, No. 3 in particular differs from the others in certain 

 proportions. We may compare it especially with No. 2, which is ot the 

 same size. Both lie in the same piece of calcareous sandstone, and are 

 depicted on plate 1\', hg. 5, and plate V. fig. 8. Both cranidiums are com- 

 pressed, No. 3 most of all. The glabella of the latter must have been 

 disproportionately long and narrow by this deformation. 



Specimens Measured 



No. I ! No. 2 No. 3 \ No. 4 



Cat. No. I Cat. No. Cat. No. ' Cat. No. 

 B. K. X B. K. 65a B. K.65b I A. K. 171 



Length of Cranidium 



Breadth of Cranidium 



Length from the anterior margin to the glabella 



Length of the glabella 



Length of occipital segment 



Posterior breadth of glabella 



Anterior breadth of glabella 



