( 657 ) 



The occipilal furrow is sliallow, ('s|KH'ia]Iv on tlio jLilnbolla. The iiock- 

 riiig hroa^leiis towards llie reiiiro and hears a litlle Inberclc there. 

 The breadth of tlic glabelhi is at the l)aek equal to its leiigtli, wliicli 

 is half the l)rea(hh of the mid-sheU. The giahelhi l>ecomes gradually 

 narrower towards the front ; in IVont it is rounded. On either side 

 there are three very indistinct lateral fni-rows. The dorsal furrows 

 are little developed. In front of the glaiiella the cheeks run almost 

 imperce])tihly into each other. On either side aji oitlojig elevation i.s 

 N'isihle on the lirni cheek, just heliind the ])lace where the dorsal 

 furrow turns down towards the centre. It is scarcely to he ol)sei"ve<l 

 that starlijig from this elevation a line-shaped one runs in the direction of 

 the corners of the cephalon, as Linnarsson tells us. This must eertaiidy 

 he attributed to the circumstance, that this mid-sludl belonged to a 

 young individual. The scale possesses no other sculpture than countless 

 very fine impressed points, placed very close to each other. 



From the properties mentioned above one may easily convince 

 oneself that the mid-shell described comes from (/Onocoryj>he impressa 

 Liius., ami that consequently this erratic-block is a piece of ExsuUuis- 

 limestone. 



The other Trilobites-remains, all of them pieces of mid-shells, are 

 too incomplete to be described in such a manner, that the species of 

 Ti'ilobites which they come from might be recognized from the 

 description. ^loreover, such a descriptioji would be more or less 

 superfluous, as the age of this erratic-block has already been suflli- 

 ciently indicated. So I think I'd better leave it and refer to the 

 authority of Dr. Grönwall with regard to the remains of the other 

 Trilobites mentioned. As he was so kind as to send me some mid- 

 shells of these Trilobites for comparison, I couhl convince myself of 

 the correctness of his determinations. 



As was mentioned above, Exsulans-Iime is found as firm rock in 

 r>ornliolm, in Schonen, and southward of M()rbyl;i,nga in Oeland. 

 Mörbylanga does not seem to have been mentioned yet in literature 

 in this connection; but Prof. Mouekg told me of it. In Schonen, 

 Exsulans-lime is Avithout any doubt met with as firm rock near 

 Andi-arum, Gislöf and Kwiks EsperOd. Most probably it is also found 

 as such, according to Linnarsson, near Fagelsang in the neighbourhood 

 of Lund. 



Grönwall tells me that my erratic-block dctes not, petrographically, 

 correspond with the Bornholm Exsulans-lime, more with that in 

 S(>uth-East Schoncji. I cannot decide whethei- it also resembles that 

 which is found at Mörbylanga in Oeland. 



In the Dutch diluvium an erratic-block of this kind was never 



