1898- 1902. No. 32.] FOSSIL FAUNAS FROM SERIES B. 35 



CcLlymmenidae ? 



Frammia dissimilis nov. gen. et sp. 

 PI. VIII, figs. 1718, fig. 19? 



In a piece of the common greyish, finegrained limestone from the 

 Reindeer Valley I found by first examination of the material, a part of 

 a thorax with connected pygidium, that reminded me of a Calymmene sp. 

 I also observed close by a hidden fragment of a trilobite head and suc- 

 ceeded in preparing it out. I was highly astonished to find that it looked 

 quite different from anything I have ever seen of trilobite heads. It is 

 highly regrettable that no more material of this interesting form occurs. 

 In the following I will give a description of what can be seen. 



Head. Nothing of the original outline is known with certainty. 



The glabella reminds one much of an Encrinurus, it is moderately 



convex with nicely rounded front line. The lateral margins, which are 



of a quite peculiar character as will be explained presently, diverge 



strongly forwards. Instead of the regular straight dorsal furrows, dividing 



between the glabella (with more or less marked transverse lobes) on one 



side and the fixed cheeks on the other, we find two deep depressions about 



two mm. in depth and projecting at the surface like four highly crenu- 



ated lines, with the crenulae or lobes on both sides of each depression 



arranged in such a way that the lower side of the apex of the outer lobes 



is extremely near to the upper of those on the inner side. The furrows 



which was filled with stone-material and detailed characters of which I was 



only able to study by breaking the head along the furrows has accordingly a 



very different transverse section in various places as may be seen from 



fig. 18. They might be compared with incomplete cylinders with relatively 



regular sides except for the lobes running out at the top, and in addition 



some funnel-shaped depressions on the lower inner side. These depressions 



seem to be situated one below each of the interspaces between the lobes 



of the surface. The number of lobes that can be seen on the outer side 



of the furrows where they are best preserved is five. A longitudinal 



section of a furrow shows that it is curved parallel to the surface, thus 



having the same depth in front and behind. 



That which is visible of the head outside these furrows in other 

 words of the fixed cheeks, shows a relatively flat surface in the post- 

 erior and inner part, curving markedly downwards towards the anterior 

 margin of the head. On both sides we find a trace of the eye pre- 

 served, too small however, to give any exact idea as to the form. On 

 the strip of the surface that we find roughly preserved on the right side 



