EURYPTERID REMAINS FROM THE PENTLAND HILLS. 589 



slope, being as wide at its base as the posterior margin of the last segment. The number 

 of segments is not certain. I have never been able to count more than nine, but in fig. 

 32 the second segment is so large that it may represent two, and the posterior end is 

 incomplete. The telson is 7 mm. wide at its base and seems to have been about 12 mm. 

 long. The whole surface of the body is covered with the pimply structure from which 

 the specific name has been derived, but the telson seems to have been smooth. 



If the number of segments is really less than 12 this form would have to be removed 

 from the Eurypterida and placed along with Bellinurus and Prestwichia among the 

 Xiphosura. There is a resemblance in texture between this species and Eurypterella 

 omata described by Matthew (6) from the Lower Devonian of New Brunswick. 

 According to his description, however, the carapace is triangular and segmented. It is 

 just possible that his specimen showed only the body segments (he only figures 9 includ- 

 ing the segmented carapace) and these broken away in front. I have not, unfortunately, 

 had an opportunity of seeing the original specimen. 



LIST OF PAPERS REFERRED TO. 



(1) Grote and Pitt, "New Crustacea from the Water Lime," Bull. Buffalo Nat. Hist. Soc, vol. iii. 



(2) Hall, " Natural History of New York," Palaeontology, vol. iii. 



(3) Hall and Clarke, " Natural History of New York," Palaeontology, vol. vii. 



(4) Laurie, "Some Eurypterid Eemains from the Upper Silurian Rocks of the Peutland Hills," T. R. S. E., 



vol. xxxvii. 



(5) Laurie, "Some points in the development of Scorpio fulvipes," Q. J. M. S., vol. xxxii. 



(6) Matthew, "Remarkable Organisms of the Silurian and Devonian in S. New Brunswick," T. R. S., 



Canada, vol. vi. 



(7) Peach, " Ancient air breathers," Nature, 1885. 



(8) Pohlmann, " Additional notes on the Fauna of the Water Lime," Bull. Buffalo, Nat. Hist. Soc, vols. 



iv. and v. 



(9) Thorell and Lindstrom, "A Silurian Scorpion from Gothland," Kongl. Svensk. Vetinck. Acad. Handl., 



vol 21. 

 (10) Walcott, "New Genus of the order Eurypterida from the Utica," State Am. J. Science and Art, 



vol. xxiii. 

 i(ll) Whitfield, "An American Scorpion," Bull. Amer. Mus. Nat. Hist., vol. i. 



(12) Woodward, " Monograph of the British fossil Crustacea, belonging to the order Merostomata," Palceon- 



tographical Society. 



(13) Schmidt, Mem. de I' Acad Imp. de St Petersbourgh, vol. xxxi. 



DESCRIPTION OF PLATES. 



(Except where otherivise stated, the figures are natural size.) 



Plate I. 



Fig. 1. Palxophonus loudonensis, n. sp. x -| 



Fig. la. Embryo of Scorpio fulvipes. Magnified. 



Fig. 2. Slimonea dubia, n. sp. Carapace and body segments. 



Fig. 3. Slimonea dubia. Body segments and telson. 



Fig. 4. Stylonurus macrophthalmus. 



