﻿BIBLIOGRAPHY OF THE MEROSTOMATA. 23 



" believed that this might be the type of a peculiar genus of fishes, and to that class I 

 referred Pterygotus in my enumeration of the fossil fishes of the Silurian system, pub- 

 lished in Murchison's great work" 14 (1839). The discovery of more perfect remains in 

 Scotland convinced Agassiz that they must be Crustacea. He adds, " I am rather 

 inclined to believe that this singular animal will become the type of a family interme- 

 diate between the Trilobites and the Entomostraca, in which, perhaps, the Eurypteri and 

 the Eidotltece will some day be included." 



21. 1845. The Rev. P. B. Brodie, M.A., F.G.S., 23 in his 'History of Fossil 

 Insects/ describes and figures a curious fossil in clay-ironstone from Coalbrook-dale 

 resembling the Caterpillar of the Emperor Moth (Saturnia pavonia-minor). This has 

 since been described (1863) by Mr. J. W. Salter, as Eurypterus {Arthropleura) ferox. 



22. Dr. H. Burmeister, 24 in his systematic arrangement of Trilobites, &c. (1846), 

 makes the Eurypterida? the first family of the tribe Palaada, which, he observes, are 

 " characterised by the possession of two large compound eyes, by the absence of 

 secondary eyes, and by having short undeveloped feelers and soft leaf-formed feet, bearing 

 gills," &c. Of the Eurypteridce he says, " In these there is no shell. The head, whose 

 position is very distinct, bears two pairs of setaceous feelers and one pair of accessory 

 parts of the mouth. There are probably nine (?) rings in the thorax, the first of which 

 bears a pair of very large rudder-shaped feet, furnished with five joints, and the suc- 

 ceeding rings seem to have borne similar leaf-like feet of an equal size. The abdomen 

 consisted of three or six rings, and was terminated by a pair of rudder-fins (?)." 



23. 1847. Hugh Miller 25 gives an interesting description of Agassiz's first 

 examination of the remains of Pterygotus in Mr. Webster's collection from Balruddery ; 

 and he figures a portion of a foot-jaw (supposed at that time to be a tail-lobe). 



24. In 1850 Dr. H. B. Geinitz 28 figures and describes a fossil remain from the 

 Chalk formation (Lower Planer) of Plauen in Saxony, which he names Limulus Steinlte. 

 Not having seen the original specimen, we should hesitate to deny its crustacean cha- 

 racter ; but we see no evidence of its affinity to Limulus, judging from the figure given. 



25. Dr. Ferdinand RoEMER, 29 in 1851, gave a notice of Eurypterus, in which he 

 suggested the affinity of that genus with Limulus; pointing out, however, the great 

 difference in the feet, &c. 



26. Mr. J. W. Salter, 30 in 1852, figured and described two fragments of the chelate 

 appendages of Pterygotus problematicus, Agassiz, from the Upper Ludlow Rock, Here- 

 fordshire. 



27. M. Ed. von Eichwald, 31 in 1854, gives figures of Eurypterus tetragonoph- 

 thalmus of Fischer, which — as Mr. James Hall has pointed out — he erroneously ascribes 

 to E. remipes of Dekay. He also figures a perfect segment of Pterygotus, which he 

 ascribes to Pt. Anglicus, Ag. He considers that Eurypterus and Pterygotus were very 

 closely allied genera. M. von Eichwald's specimens are from the Island of (Esel, in the 

 Baltic. 



