,42 



JOHAN KIÆR. 



M.-N. Kl. 



than the other two. The occipital segment is narrow, and faintly rounded 

 posteriorly. The fixed cheeks with the palpebral lobes are narrower than 

 the glabella and extend almost horizontally in an outward direction. The 

 Palpebral lobes are large. They conunenceat the posterior marginal furrows, 

 which as in Sfiriiiiclla are well developed and increase in breadth outwardly; 

 they then run in a somewhat marked arc forwards until they attain the 

 height of the toremost furrows of the glabella, and continue as a faint, 

 arched eye brim towards the frontal lobe of the glabella, without however 

 reaching the latter. In front of the eye brims there runs a deep, gutter- 

 shaped impression towards the apex of the glabella, and continues as an 

 arc in front of it. In front of this impression there is a distinct frontal 

 brim, which is broadest in the middle and narrower towards the sides. As 

 is the case in kindred forms, this frontal brim sinks markedly when the 

 cranidium is not flattened by compression. (PI. IV, fig. 7 a.) As the frontal 

 margin of the cranidium is somewhat markedly arched, the frontal brims 

 obtain a slightly triangular outline although very much less so than is the 

 case with Streniiella primaeva Brøgger. 



Dimensions: The cranidium often attains the same dimensions as 

 that of Strennella IJunarssotii. The measurements and proportions are 

 shown in the following table: 



Specimens measured 



Specimen ] Specimen } Specime: 

 No. I I No. 2 I No. 3 



7.8 mm. I ir.5mm. j 16 mm. 



Length of the Cranidium . . 

 Breadth of — „ — 

 Length of Frontal Brim . . . 



Length of Glabella 



Length of occipital Ring. . . 

 Posterior Breadth of Glabella 

 Anterior Breadth of Glabella 



As will he seen from the above, specimen No. 2 differs especially bv 

 the apparent greater length of the frontal brim: this is due to an elevation 

 of the latter. On account of pressure, the glabella also of this specimen 

 has become broader than usual. It is of interest to note that anteriorly 

 the glabella is at times rounded and at others slightly pointed angularly; 

 in this respect the species — as already mentioned by Linnarsson — appears 

 to vary greatly. 



