22 No7'(h American Palaeozoic Crustacea. 



remipes, Bronn, 1837; Lethea Geognostica, vol. 1, p. 666, pi. 9^, fig. 1 ; 



pi. 9, fig. 1. 

 remipes, Salter, 1859 ; Quart. Jour. Geol. Soc. London, vol. 15, p. 255. 

 remipes, Nieszkowski, 1858 ; Der Eurypterua remipes, plates 1, 2. 

 remipes, Hall, 1859 ; Pal. New York, vol. 3, p. 404*, pi. 80, figs. 1-12 ; 



pi. 80 a, figs. 1-6 ; pi. 83 b, fig. 2 ; also p. 403*, figs. 6, 7. 

 remipes. Numerous authors. 

 Eusarcus scoi-pionis, Grote & Pitt, 1875 ; Bull. Bufi'alo Soc. Nat. Sci., vol. 3, p. 1 ; 

 idem., vol. 3, p. 17 ; photographic plate. Waterlime. 



scorpionis (Grote & Pitt), Pohlman, 1886; Bull. Buffalo Soc. Nat. Sci., 

 vol. 5, p. 30, pi. 3, fig. 3. Name pre-occupied : see E. Poldmani. 

 Eusarcus grandis (Grote & Pitt), Pohlman, 1886 ; Bull. Buffalo Soc. Nat. Sci., 

 vol. 5, p. 31. Referred to E. Pohlmani, Vogdes. 

 stylus. Hall, 1884; 2d Geol. Survey Penn., vol. PPP, p. 34, pi. 5, 

 figs. 12-15. Carboniferous. 



Hymenocaris, Salter, 1853 ; 22d Kept. Brit. Assoc. Adv. Sci. Trans., p. 56. 

 Isochilina, Jones, 1857 ; Mem. Geol. Survey Canada, Dec. 3, p. 97. Annals 

 & Mag, Nat. Hist., 2d series, vol. 1, p. 248. Type /. Ottmca, Jones. 

 " Equivalve ; the margins of the valves meeting uniformly, not overlap- 

 ping as in Leperditia; greatest convexity of the valves either central or 

 towards the anterior portion. Eye-tubercle present. Muscular spot not 

 distinct externally." (Jones, Mem. Geol. Sur. Canada, Dec. 3, p. 97.) 

 Leperditia (Isochilina) armata, Walcott, 1883 ; Desc. New Species of Fossils 

 Trenton group, p. 7," pi. 17, fig. 10. Trenton. 



Leperditia (Isochilina) armata, Walcott, 1884; 35th Rept. New York State 



Mus. Nat. Hist., p. 213, pi. 17, fig. 10. 

 Ci/therina cylindrica. Hall, 1852 ; Pal. New York, vol. 2, p. 14, pi. 4, figs. 8a, 

 8 b. Medina. 



Leperditia (Isochilina) cylindrica, Jones, 1858; Annals & Mag. Nat. Hist., 



.3d series, vol. 1, p. 253 ; also Geol. Survey Canada, Dec. 3, p. 101. 

 Leperditia (Isochilina) cylindrica. Hall, 1871 ; Desc. New Species Fossils Hudson 

 River group, p. 7. Hudson River. 



Leperditia (Isochilina) cylindrica, Hall, 1872; 24th Rept. New York State 



Mus. Nat. Hist., p. 231, pi. 8, fig. 12. 

 Leperditia (Isochilina) cylindrica. Hall & Whitfield, 1875 ; Pal. Ohio, vol. 2, 

 p. 101, pi. 4, fig. 5. 

 Prof. T. Rupert Jones (Annals & Mag. Nat. Hist., 5th series, London, 

 vol. 14, 1884, p. 344) refers the species from the Medina sandstone to 

 Leperditia cylindrica, Hall, and that described in the 24th Rept. New 

 York State Mus. Nat. Hist., p. 231, pi. 8, fig. 12, and Geol. Survey 

 Ohio, vol. 2, pt. 2, p. 101, pi. 4, fig. 5, doubtfully to the genus Pr{?iiitia. 

 cylindrica. Miller, 1875; Cincinnati Quart. Jour. Sci., vol. 2, p. 351, 

 Leperditia (Isochilina) gracilis, Jones, 1858 ; Annals & Mag. Nat, Hist., London, 

 vol. 1, p. 248, pi. 10, fig. 2. Trenton. 



Leperditia (Isochilina) gracilis, Jones, 1858 ; Geol. Survey Canada, Dec. 3, 

 p. 98, pi. 11, fig. 15. 



