508 Proceedings of the Royal Physical Society. 



those of Shear Burn and many others like it, especially 

 those in Joppa quarry, where the remains of both were 

 buried in dust in an old vegetable soil, we are forced to think 

 of both as breathers of air, and that the Carboniferous 

 Eurypterids, like the ancient and the recent scorpions, were 

 Arachnids, living in the air and on dry laud. 



4cth, That, as a rule, the places where Eurypterids ought 

 to be sought are plant-beds and black fakes, and that, while 

 the latter are sure to yield fragments, in the former whole 

 Eurypterids may also be found — a hint by which I hope our 

 friends who search for fossil plants may profit, and, like Mr 

 Kidston, give us the benefit of their finds, by getting Mr 

 Peach to describe them as he has lately so admirably done 

 the small head from Eadstock. 



Addenda. — As further proofs of the prevalence of Euryp- 

 terids in carboniferous strata, and also as a directory to those 

 who may wish to search for Eurypterids, T may here give 

 some fugitive occurrences which are known to me from 

 books or collections. 



1. East Kirkton Quarry, Bathgate, — The original locality 

 from which the specimen described by Dr Scouler as Eidothea 

 was obtained. In all five heads are said to have been got 

 from this place. {See Hibbert's paper in Trans. Roy. Soc. 

 Edinb., xiii., p. 234, and Woodward's Monographs, Pal. Soc., 

 1866-71.) 



2. Burdiehouse Quarry. — In the Museum of Science and 

 Art, Edinburgh, a slab of this limestone is exhibited, on 

 which is a large piece of Eurypterid skin consisting of 

 several body segments. 



3. Glencartholm, near Langholm. — Several fragments de- 

 scribed by Mr Peach in Trans. Roy. Soc. Edinb., xxx., pp. 517, 

 521, and a nearly whole Eurypterid described by Dr Wood- 

 ward in Geol. Mag., Nov. 1887. 



4. Cove Shore, 1 mile N.E. of Cockburnspath. — Comb of 

 an Eurypterid, described by Mr Salter as a palm-leaf, but 

 shown to be a comb by Mr Peach, Trans. Roy. Soc. Edinb., 

 XXX., p. 518. 



5. Burghlee Pit, Loanhcad. — Large piece of Eurypterid 

 skin, with fine embossing in one part, and rough, strong 



