WATERLIME GROUP. 383 



previously described by Dr. Scouler in the Edinburgh Journal of Natural 

 Sciences for 1831, as Eidothea*. 



In 1839, Fischer de Waldheim described a species of Eurypterus from 

 Podolia, the E. tetragonophthalmus ( Bulletin de la Soc. Imper. des Natur. 

 de Moscou). 



In 1841, Mr. Conrad, in the Annual Report on the Palaeontology of 

 N,ew-York, page 38, refers to the Eurypterus, recognizing but a single 

 American species, the E. remipes, which, he says, when perfect, has a 

 long spiniform tail like Limulus, but more obtuse and finely serrated. 



In 1843, Mr. Vanuxem, in his Geological Report of the Third District 

 of New- York, figured an outline of the head and first articulation of the 

 E. remipes ; such fragments being far more common than other portions 

 of the fossil. 



BuRMEiSTER (Organization der Trilobiten, etc., 1843, p. 62), and the 

 same work, edited by Professors Bell and E. Forbes, and published by 

 the Ray Society, 1846, pp. 52 & 54, and in the preceding pages, has 

 discussed the relations of the Eurypterus to the trilobites and other 

 Crustacea. 



1850 - 1856 : H. G. Bronn and F. Rcemer ( Lethea, pi. ix, f. 1 & 2 as 

 above, and PI. ix'), the latter figure being of the E. lacustris of Harlan. 



In 1851, Dr. Ferdinand Rcemer, in Dunker and Von Meyer's Palaeonto- 

 graphica, gave a notice of the genus : " Ueber ein bisher nicht be- 

 " schreibenes exemplar von Eurypterus, aus Devonischen schichten des 

 " Staats New- York in Nord-Amerika". The specimen figured is the E. 

 lacustris of Harlan, which preserves the head and body entire, with a 

 portion of the spineform tail and two of the appendages on one side. 



1853 : James D. Dana, Crustacea of the United States Exploring 

 Expedition under Captain C. Wilkes, Vol. ii, p. 1450f. 



* Dr. HiBBERT ( loc. cit.) has erroneously referred to Dr. Harlan as the author of ihe Germs Eurypterut , 

 citing the generic description which is quoted from Dr. Dekav's original paper in the Annals of the New- 

 York Lyceum. 



t Dr. Harlan is here erroneously cited as the author of the Genus Eurypterus. 



