Trans. N. V. Ac. Set. 8 Oct. i6, 



deposits like the the Clinton ore, which in his view was most like the 

 magnetites and hematites of the Archaean rocks. At various places 

 iron-sands are accumulating on our present coasts, as at Moisd, on the 

 St. Lawrence, on Long Island, and on the coasts of Japan and New 

 Zealand. It is only reasonable to suppose that such accumulations 

 took place in ancient times, and that these were represented in some 

 of the ore beds now known. The suggestion of Mr. Julien was new 

 and important ; but various facts, such as the presence of phosphorus, 

 the absence of foreign minerals and the retention of limonite structure, 

 seem to indicate that nearly all of our important iron ore deposits had 

 been formed by chemical rather than organic processes. 



Prof. D. S. Martin then remarked upon 



A NEW EURYPTERID FROM THE CATSKILL GROUP. 



(Abstract), 



The specimen of the fossil referred to had recently been seen by him 

 in the State Geological Collection at Albany. The family of the 

 Eurypterids forms an exceedingly interesting group of crustaceans, 

 constituting, with the Trilobites and the Xiphosura or Limuloids, the 

 order Merostomata — which has by some authors been separated 

 from the other Crustacea and raised to the rank of a distinct class, or 

 at least sub-class. The existing Limulus, or " horse-shoe crab," of our 

 own sea-coast, is a familiar type of the group, which is otherwise almost 

 wholly extinct ; its relations to the other orders were briefly referred to. 

 The Eurypterid family was best developed in the Water-lime Group of 

 the Upper Silurian, but has been found to range through a large part 

 of the Paloeozoic rocks, both of our own country and of Europe — Mr. 

 Walcott's lately-described genus, Echinorhy7ichus, carrying it down to 

 the Utica Slate of the Lower Silurian, while others are known even as 

 high as the Carboniferous. The specimen in question consists of a 

 very large head-shield — nearly a foot in length and breadth — and is 

 named Slyloj/urus excelsior. It was found in the Catskill group, at 

 Andes, in Delaware County, N. Y., and from its form and the position 

 of the eyes, has been referred to the genus Styloi^urus, which has not 

 before been recognized in this country. 



DISCUSSION. 



The President stated that the original specimen, to which reference 

 was made by Prof. Martin, was now in the possession of Prof. Geo. H. 

 Cook of New Jersey. The rocks of the Catskill group were generally 

 barren of fossils, only a few fishes and plants having been found. It 

 was a local deposit, probably of fresh water origin, corresponding in 

 character to parts of the Old Red Sandstone of England, but it was not 



