( 656 ) 



sucliliko Olios. This nel-work is verv (iisliiicl on the loss stoop part, 

 not so (lisliiR'l on the olhor, wliero it is scarcely to he seen with a 

 iiia;i,iiityiiig' glass. Moivover tiicrc are on this iiileriial cast round 

 elevations. 



It bein^' quite iin))ossil»le lor nie to lind what species of Trilobites 

 this oiF-pi'int came from, the exact age of this erratic-block could not 

 be tixed. The nature of the stone made it likely to l)e (iimbrian, 

 and that, too, 31id-Cambrian, because of the suppositional Paradoxides- 

 rcmains. 



When, however, a few weeks ago, my friend dr. (tikln wall from 

 Copenhagen, the author of 'dJornholuis Paradoxidoslag og dercs Fauna" 

 (Danmarks geologiskc Undersögelse II Kaekke No. 13.) took a view 

 of my collection of erratic-blocks, he recogni/ed in the said ofl-print 

 that of a right cheek of ('onocoryplie Exsulans Liiirs. ') Herewith 

 the age of this erratic-block was already exactly determined, for the 

 occurrence of these Trilobites-remains is characteristic of the lower 

 part of the layers with Paradoxides Tessini Brongn. 



This division consists, in Schonen, in iJornholm and (according to 

 an oral cominunication of prof. Mobkug) to the South of M(»rbyl'inga 

 in Oeland, of limestone, which after this Trilobite is at present 

 mostly called Exsulans-limestono, whilst it ceased to be called Coro- 

 natus-limestone. 



Gkönwall's opinion was bi-illiantly confirmed, Avhen, on his breaking 

 the stone further to pieces, remains of the Trilobites Conocoryplie 

 lm|»ressa Linrs,'') Liostracus Aculeatus Aug."'') and Soleno[)lenra Parva 

 Linrs.^) were exposed to view by him. Moreover a remnant of 

 Acroteta Soeialis v. Seebach was found, which, however, also occurs 

 in older and in younger layers, which is not the case with the 

 Trilobites mentioned just now\ 



The only remnant that has been well preserved, is a mid-shell of 

 (\)iiocoryphe Impressa Linrs. It is for the greater part exposed to 

 view\ Only on the sides it is still covered by the stone ; so the 

 facial sutures are invisible. It must have belonged to a young indi- 

 \ idual, its length being only 6 millimetres. It is slightly vaulted, the 

 glabella a little more than the other part. In front it is bounded by 

 a tlat border alon*»- the edge, which border is broadest in the middle. 



LiNNAP.ssoN. Om. Faunaii 1 Kalken med Gonocory|>lic exsulans (Coronalus- 

 KalkenV Sveriges geologiska Undersükning. 1879. Ser. G. No. 3.j. pag. 15. tafl. II, 

 fig. 21, '2± 



~) LiNN.\KssuiN. loc. cit. pag. 20. tad. H. tig. 29, 30. 



•'') LiNNARssoN. loc. ciL pag. 11. tall. I. fig. 12 — 15. 



*) LixNARSsoN. luc. cit. pag. 14. lafl. I. fig. 10—19, 20? 



