78 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Amphipod order. I am very much obliged to Mr. Bate for this 

 analogy (which would certainly have escaped me in Milne-Edwards's 

 work). Mr. Bate's late papers on the Amphipods (Ann. Nat. Hist. 

 1861) admirably illustrate this peculiar group. 



Etjrypterus pulicaris, spec. nov. Figs. 9, 10. 



This minute form (sent under the name of " Stylonurus or Eury- 

 pterus " by Dr. Dawson) can only be compared with such species as 

 I have described and figured in the 15th volume of our Journal. 

 The small E. pygmceus (op. cit. p. 232, pi. 10. figs. 5, 6) resembles 

 our species in size ; but the tail -joint, fig. 18 (E. abbreviates), figured 

 from the Downton Sandstone (Uppermost Ludlow Bock), is the 

 nearest in point of shape. 



The tail-joint is a characteristic portion, and is sufficiently pre- 

 served in the specimen from Nova Scotia to show that it is a distinct 

 species from the British one. I hope that better material will soon 

 occur to Dr. Dawson's search. The entire length of the more per- 

 fect specimen (including nine body -joints and the telson) is less than 

 1 an inch. These nine body -joints taper rapidly backward, from 

 -i-th of an inch to quite a narrow base in the penultimate joint above 

 the telson. The telson is broader than the penultimate joint, swelling 

 rather rapidly from its origin, and then suddenly contracting into 

 the serrate tip. 



Locality. Devonian rocks ; St. John's, New Brunswick. Dr. 

 Dawson desires me to add, that the rare Devonian forms from near 

 St. John's were collected and given to him by Messrs. Matthew, 

 Hartt, and Payne, of that city. 



Eurypterus ; a large species allied to E. Scouleri, Hibbert. Fig. 5. 



A mere fragment of a large body-ring, which nevertheless indicates 

 a species nearly as large as the great Scotch Eurypterus (E. Scouleri, 

 Hibbert). 



The large " teardrop-tubercles " along the hinder margin suffi- 

 ciently show the nature of the ornament. These, in all probability, 

 were replaced by spines on the carapace, as in our own Coal-mea- 

 sure species (to be described in a succeeding paper). 



The carbonaceous film which remains in part on the surface, 

 cracked (by shrinking) into minute areolae, represents evidently a 

 corneous substance, from which the animal matter has been dissolved 

 away. The suggestion of Professor Huxley, that the large Eury- 

 pterida? had a thick crust like that of Limulus, with but little cal- 

 careous matter, is most probably true. 



Locality. Coal-measures ; Port Hood, Cape Breton. 



Etjrypterus (?), tail of. Fig. 4. 



This small specimen, found with the Diplostylus in the Joggins 

 plant-bed, has evidently nothing to do with that genus. It is im- 

 perfect, but can hardly be supposed to be other than the caudal joint 

 (broken) of a Eurypterus or allied form. It is, as usual in that 

 genus, contracted at its origin ; but swells out afterwards, in the 



