( 658 ) 



of wliicli arc nboiil 4 coiiliiiicd-cs. Tlicy oriuiiially ina<I(' |>ai-l of' one 

 eiTalif-bloc'lv, wliich was foinul wIkmi llio i-amparls near oiio of (lie 

 t'onnei' Groningen gales (l)olei-inge)»ooi'l) were ilng oil". One of Ihe 

 l)ic('es still shows a |)ai'( of the oi-iginal sni-face possessing distinct 

 glaeiei'scratches. 



From the [)ieeos preserved it may be conebicled that this erratic- 

 block consisted of green-grey, rather comjiact, mai-Iy lime-stone, in 

 wliicli nilh a magnifying glass many lillle grey grains and here and 

 there little dark-green Instrons Glanconite-grains may be dislingnislied. 

 I observed one single Pyrite-crystal. At the snrtace it had, to a de])lli 

 of about 1 centimetre, become more or less yellow, under the inlbienco 

 of corrosion. 



The part preserved also shows that through this erratic-block ran 

 a layer that was rich in Trilobites-remains. For the gi'eater part the 

 transverse sections of them are visible. In one piece, however, s(»nie 

 remains arc partly or entirely exposed to view. A mid-shell is the 

 most important of them. 



This mid-shell, across which run various Haws, and which conse- 

 ([uently is not likely to have entirely retained its original shape, is 

 lengthwise rather strongly vaidted and has a length of 12 millimetres, 

 its breadth amounting to about J4 millimcti'cs. It is almost every- 

 ^^ here the same, the lines that c(tnnect the beginning and the termi- 

 nation of the facial suture, ruiming almost |)ai-allel to the longitudinal 

 axis. The front-edge is regidarly ciii'ved. The occi|)ital-furrow is 

 shallow, especially on the glabella. The length of Ihe ralhei- broad 

 glabella is about '\ of that of the mid-shell. It is tongue-shaped and 

 bounded by shallow dorsal furrows. The lattei- first run iieai-h" parallel 

 t(> each other and then tui'ii to the centre, w here flie\- meet. J>ateral 

 furrows are not to be distinguished on the glabella. Thai part of the 

 mid-shell which lies in friuit of the glabella, slants down rather 

 (piickly. The parts on cithei" side slant down more slowh. 



As to the sculpture, along the front-edge of the uiid-shcll, parallel 

 to it, ruji tine strijK's. The shell moreoNcr shows ;Ul oxer, \('ry Jiear 

 each other, line pricked points. The coloin- of the sIk'H is |»arlly black, 

 jtartly yellow-grey (cream-coloured). 



In spite of repeated eiVorts I had never before» succeeded in dis- 

 covering what species of Trilobites this mid-shell came tVcun. This 

 summer, h(tw"e\er, I was more fortunate. On my journey to ( )elan(i 

 it chanced that near the hospital at llorgholni a jut was being dug 

 and that, while doing this, j)eoplc had penetrated as far as the layer 

 with Paradoxides Oelandicus Sj(>gren. The stone that had been produced 

 from the pit, was still present. It consisted of greenish marl-slate, 



