134 THE HABITAT OF THE EURYPTERIDA 



in the same beds and really closely associated or whether they are 

 found only along certain partings as is indeed indicated by Peach 

 and Home who say that "A characteristic feature of this eurypterid 

 bed is the abundance on the divisional planes of that enigmatical 

 fossil Dictyocaris ramsayi, forming, indeed, large black patches about 

 an inch and a half across." One fact at least is clear: The eurypterids 

 occur in a very thin band and are found in abundance in one section 

 only, while a few fragments are found in one or two other nearby 

 localities. The eurypterids are confined within a few inches verti- 

 cally, while laterally the remains have a very limited extent, dis- 

 appearing within a few yards. The occurrence at Gutterford Burn 

 is in bed A of Brown and Henderson which contains ten species. 

 Two species have been recorded from bed H to the northwest in a 

 section exposed by the Henshaw Burn, a tributary of the North Esk. 

 Except for these two isolated occurrences no eurypterids are found 

 in the other beds or even in the same beds as they are traced along 

 the strike. The remains of sixteen species representing five genera 

 appear suddenly in a band a few inches thick, without forerunners 

 in the underlying beds and with not a single straggler in the imme- 

 diately overlying beds. 



The following species of merostomes have been obtained from 

 Gutterford Burn according to the identifications made by Malcolm 

 Laurie (Peach and Home, 215, 132, 593, 594): 



Bembicosoma pomphicus Laurie 



Stylonurus (Drepanopterus) pentlandicus (Laurie) emend. 



Clarke and R. 

 S. (Drepanopterus) bembicoides (Laurie) emend. Clarke and 



Ruedemann 

 S. (Drepanopterus) lobatus (Laurie) emend. Clarke and 



Ruedemann 

 Eurypterus conicus Laurie 

 E. minor Laurie 



Eusarcus scoticus (Laurie) emend. Clarke and Ruedemann 

 Eurypterus 3 sp. undet. 

 Stylonurus elegans Laurie 

 S. macrophthalmus Laurie 

 S. ornatus Laurie 

 Slimonia dubia Laurie 

 Dictyocaris ramsayi Salt 

 Palaeophonus loudonensis Laurie 



