﻿28 BRITISH FOSSIL CRUSTACEA. 



terus Scouleri, and Limulus rotundatus, all more or less correct. He repeats most of his 

 former views, and makes some critical remarks upon Mr. Salter's restoration, as given in 

 ' Siluria,' which, however, he reproduces. 



47. At the close of 1859 Prof. James Hall, 53 Geologist for the State of New York, 

 in his ' Report on the Paleontology of New York,' gives a very excellent account of 

 Eurypterus, with many figures of the actual fossils and restorations of the genus, also 

 figures of the more rare American species of Pterygoti. Frequent reference will be made 

 to Prof. Hall's work in the course of this Monograph. 



48. Mr. W. H. Bally 54 describes (1859) some new forms of Limuli from the Coal- 

 measures, for which he proposes the names Belinurus regince and B. arcuatus ; they were 

 found in the Bilboa Colliery, Queen's County, Ireland. 



49. In 1862 Mr. C. Giebel 55 describes a Limulus, which he names L. Decheni, from 

 the Braunkohlen-Sandstein near Teuchern, Prov. Saxony. 



50. 1862. Prof. James Hall 56 figures the carapace of what may possibly be, as 

 he suggests, the shield of a Limulus-\ike Crustacean in the Potsdam Sandstone, Black 

 River, Wisconsin. It has, however, somewhat more the aspect of a crushed Trilobite 

 shield than the head of a Limulus. 



51. In May, 1862, Mr. J. W. Salter communicated to the Geological Society of 

 London 67 descriptions and figures of some species of Eurypterus and allied forms, and 

 he there makes the following remarks upon Pterygotus, &c. : 



"Since the appearance, in 1859, of the Memoir by Prof. Huxley and myself on 

 Pterygotus and its allies, the great work of Prof. Hall, of Albany, has appeared ('Palaeon- 

 tology of New York,' vol. iii), containing the fullest material for the illustration of this 

 genus ; and following, as it did, upon the very full account given by Dr. Wieskowski,* it 

 has completed our knowledge of the structure of this remarkable genus. And there seems 

 to be now no doubt whatever that the anomalous plates and processes,t about the position 

 of which Prof. Huxley and myself were compelled to guess, and which for many obvious 

 reasons were compared with the under portion of the head, really belong to the under part 

 of the thorax. All this was as satisfactorily made out by the Russian author as by 

 Prof. Hall's independent researches. We had also arrived at the same conclusion before 

 Wieskowski's* admirable paper reached us. For, previous to the Meeting of the British 

 Association at Aberdeen, in 1859, I was sent by the Director-General of the Geologica 

 Survey to examine the collections made by Mr. Slimon, of Lesmahago ; and in that fine 

 series (which was sent to the Meeting for exhibition) we found abundant proofs of the true 

 position of the sternal plates, such as Wieskowski* and Hall have figured, and of the place 

 of the post-oral plate, previously assigned by Prof. Huxley to the hinder margin of the 

 mouth. The position of the chelae in these new specimens also confirmed the Professor's 



* For Wieskowslu read Nieszkowski. See Ante, p. 26, ^| 43. 

 f The thoracic plate, or operculum. 



