synopsis of gi:ni:ha. 



s 1 i x 



Neolimulus falcatus, Woodward. 



Tliis genus is represented by a single 

 species which demonstrates the early ap- 

 pearance of the true limuloid Crustacea. It 

 is probable that its nearest known ally is the 

 Neolimulus falcatus, Woodward, from the Upper 

 Silurian of Lanarkshire. The latter fossil is 

 regarded by Packard (Mem. Nat. Acad. Sci., p. 

 151, 1886), as not referable to the Xiphosura, 

 and, together with the genera Hemiaspis, Bunodes, 

 Pseudoniscus and others are made to constitute 

 a distinct group {suborder, Packard), Synzipho- 

 sura. This separation is made principally on 

 the ground that in all these forms the abdomi- 

 nal segments are free and not coalesced as in 

 Limulus. It may be questioned whether the non-anchylosis of the segments 

 has been satisfactorily demonstrated in Neolimulus, or if so, whether a division 

 of so high value as a sub-order is wisely established upon a single larval 

 character. 



E U R Y PTERID A . 



Family, Eurypterid/e. 



Genus EURYPTERUS, Dekay. 1825. 



L825. Eurypterus, Dekay. Ann. Lyceum Nat. Hist. New York. 



1831. Eidothea, Scouler. Edinburg Journ. Nat. and Geograph. Science. 



1S35. Eurypterus, Hablan. Med. and Phys. Researches. 



1835. Eurypterus, Harlan. Trans. Geol. Society Penna. 



1835. Eurypterus, Bronn. Letliaea geognostica. 



1836. Eurypterus, Hiebert. Trans. Roy. Soc. Edinburg. 



1839. Eurypterus, Fischer. Bull. de. laSoc. Imp. des Naturalistes de Moscou. 



1841. Eurypterus, Conrad. Ann. Rept. Pal. New York. 



1843. Eurypterus, Yanuxem. Geol. N. Y.; Rept. Third Dist. 



1S43. Eurypterus, Burmeistr. Organ, der Trilobiten. 



1848. Eurypterus, C. F. Roemer. Palaeontographica. 



1850. Eurypterus, C. F. Rcemer. Lethaea geognostica. 



1S53. Eurypterus, Dana. Crust. U. S. Expl. Exped. Capt. Wilkes. 



1854. Eurypterus, Eichwald. Bull, de la Soc. Imp. des Naturalistes de Moscou. 



1855. EurypU rus, McCoy. British Pala>oz. Fossils. 



1855. Lepidoderma, Redss. Denkschr. der Akad. Wissensch. Wien. 



1856. Eurypterus, Huxley. Quart. Jour. Geol. Soc. 



