146 THE HABITAT OP THE EUEYPTERIDA 



The eurypterids do not occur in the beds with the marine fossils but 

 always in distinct zones a few inches thick, their whole representation 

 being confined to not more than a few feet in the entire Oesel series. 



West of Rootzikull a distance of about 5 versts there is an exposure 

 not far from Gesinde Wessiko Maddis along a little brook which rises 

 near Liimmada, but is usually dried up. Here the lower rock is 

 limey, not dolomitic and the eurypterids are not very abundant, but 

 the rock above is crowded with Platyschisma helicites, Leperditia 

 phaseolus, and the delicate fish scales of Coelolepis schmidti Pander 

 together with fragments of seventeen other species of fishes (Schmidt, 

 241, 168, 248, 29). The upper beds are evidently the continuation of 

 the brecciated limestone of Wita. Proceeding in the same south- 

 westerly direction from Rootzikull towards the coast one comes to 

 the Attel estates or Gut Attel where there is a small outcrop of yel- 

 low, coralline limestone which on exposure weathers white and which 

 carries Stromatopora sp., Cyathophyllum, Favosites hisingeri, and F. 

 fibrosa; similar brecciated inclusions occur as at Wita. A little farther 

 to the west in the village of Attel may be seen on the west side of the 

 deeply indented bay a coarsely crystalline yellow-dolomite and be- 

 neath this is the coral limestone of the Attel estates which here is 

 not entirely composed of corals, but contains also Eurypterns fischeri, 

 Lepeditia baltica, Orthoceras bullatum, and Murchisonia cingulata = 

 M. compressa, the last being the same species which is found in zone 

 VI in Gotland. It is clear that the eurypterid remains at Attel are 

 found not in the plattenkalk beds, which here are barren of all organic 

 remains, but in the overlying coral limestones (Nieszkowski, 197, 

 307; Schmidt, 241, 169, 170). The last section in this series is at the 

 Soegi-ninna point about 12 versts from Rootzikull, where the rock 

 walls rise from the sea to a height of 10 or 12 feet. In the upper part 

 is seen the typical crystalline dolomite with nodular inclusions which 

 here and there give place to thin, unaltered limestone beds with 

 Leperditia baltica and Murchisonia compressa; the lower part of the 

 rock walls consists of platten dolomites which appear to be the con- 

 tinuation of those of Wita, but which have not yet yielded any euryp- 

 terid remains after fifty years of patient search (Schmidt, 151, 169, 

 170). 



The outcrops in the southeastern portion of Oesel show, only 

 traces of eurypterids here and there. For instance, between Uddafer 

 and Ladjal, north of Arensburg, Schmidt found in small ditches along 

 the roadside Phragmoceras sp.,Spirigerina prunum, S. didyma, Pleuro- 



