THE MEROSTOMATA. 



233 



vided with toothed basal joints, are attached to the sternal 

 surface of the shield, and the mouth is covered, behind them, 

 by a large oval plate which appears to represent a meta- 

 stonia (Fig. 59, B^ g). Some of the anterior litnbs are fre- 

 quently chelate {Fterygotus) ; the terminal joints of the most 



PiQ. m.—Eimmterus remims (after Nieszkowski).^— .•I, do'-eal aspect. J3, ventral 

 ai^pect. CfK t'le cenhalo-thoracic shield bearing «. the eyeg. and 6, c. d, e,./, ihe 

 locomotive limhg; T, telson ; g, the metastouia; h, the eterual plates of the an- 

 terior free somites. 



posterior pair are generally expanded and paddle-like. The 

 integument often presents a peculiar sculpture, simulating 

 minute scales. The sternal surface of one or more of the 

 anterior free somites is occupied by a broad plate, with a 

 median lobe, and two laterally-expanded side-lobes (Fig. 59, 



» " Der Eurypterus remipes, aus den obersilurisclien Schichten der InBel 

 Oesel." 1859. 



