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- 

 stoma (Fig. 59, B, g). Some of the anterior limbs are fre- 

 quently chelate [Pterygotus] ; the terminal joints of the most 



CC/l 



Fig. 59.—Eurvpteru$ remipes (after Nieszkowski). 1 — A, dorsal aspect. B, ventral 

 aspect. Cm, tlie cephalo-thoracic shield bearing a, the eyes, aud b, c, d, <?,/, the 

 locomotive limhs ; T, telson ; g, the metastoma; h, the eternal 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, 



1 " Der Eurypterus remipes, aus den obersilurischen Schichten der Insel 

 Oesel." 1859. 



