4«4» PALAEONTOLOGY OF NEW-YORK. 



Eiii*} pterus reiiiipcs. 



Plate LXXX. Fio. 1 - 12; Plate LXXX A. Fia.1-6; and Plate LXXXIII B. 



Fig. 2. 



Euryptenu remipa : Dkcat, Annals of the Lyceum of Natural History of New- York, Vol. i, 



pa. 375, pi. x.xix : 1825. 

 £. remipes : Hajilak, Transactions of the Geological Society of Penixsylvania, Vol.i, pa.OC, 



pl.v : 1832. 



— — : Idem, Medical and Physical Researches. 



— — : Milne-Edwakds, Hist. Nat. de.s Crustacoes, III, p. 422. 



— — : BuaHKLSTKH, Organization der Trilobiten, p. G2 : 1843. 

 — - — : Idem, Ray Society Publication, 1846, p. 54. 



— — : Bronx, Lcthea Geogno.stica, I, p. 109, t. ix, f 1. 



— — : Saltkr, Quarterly Journal of the Geological Society of London, p. 235 : 1859. 



Also cited by numcrou.s other authors. 

 Not Eurypterus remipes, Eichwald, Bui. Imp. Soc. Nat. Moscou, 1851. 

 Not — — RoiMER, Palicontograpiiica, I, t. 27 : 1848. 



Not — — RffiMKR,-Liethea, Ed. iii, 1854, t. ix', f. 1. 



Cabapace roundish or semioval, about three-fourths as long as wide, often 

 " marked anteriorly by a deep indented line formed by the junction 

 " of the superior and inferior plates". Eyes lunate, depressed or mo- 

 derately convex, marked by concentric strise. Body moderately convex 

 above, elongate, tapering ; the thorax in the middle a little wider than 

 the carapace, contracting below the seventh articulation ; the abdomi- 

 nal portion distinctly narrower, and the length of the joints increasing, 

 the last being extended into a long slightly curved triangular spine 

 which is serrated at the angles. Joints of the body slightly imbricating ; 

 and some of the abdominal joints, at the lateral margins, slightly pro- 

 longed over the ones below in angular processes. 



On the lower side, a small oval post-oral plate, slightly notched on its 

 anterior margin, overlaps the adjacent edges of the broad plates of the 

 swimming feet, and apparently lies upon the cavity of the mouth. The 

 four anterior pairs of feet converge towards the anterior margin of this 

 plate : the first joints are short, and the second ones much longer ; the 

 first two or three joints are unarmed, while the remaining ones are 

 furnished on their outer angles with smooth chelate tips, the extreme 

 one of all being the longest. The two anterior pairs of feet extend but 



