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



Calymmenidae ? 



Frammia dissimilis nov. gen. et sp. 

 PI. VIII, figs. 17-18, 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 



