26 THE HABITAT OF THE EURYPTEEIDA 



considerable amount of structureless carbonaceous matter distributed 

 in thin layers" (Laurie, 145, 151). The only other fossil which Mal- 

 colm Laurie found in the rock at the time of his first discovery was 

 Dictyocaris ramsayi, but since then Peach and Home have made a 

 large collection of other types. In 1898 Laurie added some new dis- 

 coveries from Gutterford Burn, and among these the one specimen of 

 a scorpion, much crushed and lying imbedded in the carbonaceous 

 matter. In the Pentland Hills the Wenlock formation is a yellowish 

 sandstone and conglomerate, showing cross-bedding and in some 

 places ripple marks, and is exposed in several inliers in the Old Red 

 Sandstone, later formations having been eroded. Extensive collec- 

 tions have been made here by Henderson, Brown and Laurie, the 

 latter describing a number of new species. One of the best sections 

 is seen along Gutterford Burn, a tributary of the Esk, where the 

 following specimens have been collected, the determinations having 

 been made by Laurie. 



Bembicosoma pomphicus Laurie. 



Stylonurus (Drepanopterus) pentlandicus (Laurie). 



S. (Drepanopterus) bembicoides (Laurie). 



S. (Drepanopterus) lobatus (Laurie). 



Eurypterus conicus Laurie. 



E. minor Laurie. 



Eusarcus scoticus (Laurie). 



Eurypterus 3 sp. undet. 



Stylonurus elegahs Laurie. 



S. macrophthalmus Laurie. 



S. ornatus Laurie. 



Slimonia dubia Laurie. 



Dictyocaris ramsayi Salter. 



Palaeophonus loudonensis Laurie. 

 Upper Siluric or Ludlow. The Ludlow of England has yielded 

 eight species of eurypterids all in a most fragmentary condition, 

 making it difficult to determine forms accurately. They all come from 

 the Ludlow outcrops in Shropshire and Herefordshire. From the 

 Aymestry limestone there are some remains which have been doubt- 

 fully referred to Pterygotus problematicus. This same species appears 

 again and again throughout the remainder of the Siluric, being rare 

 in the Upper Ludlow group, but becoming more common towards the 

 top of the Temeside group in the Ludlow district. Eurypterus acumi- 

 natus Salt, and E. linearis are rare in the Upper Ludlow, the former 



