CLASS II 



ARACHNIDA— EUEYPTERIDA 



785 



Erettopterns Huxley and Salter. Like Pterygotus, but with a bilobed 

 telson. Silurian ; Lanarkshire. 



IlughmiUeria Sarle. Small animals with carapace as in Pterygotus, chelate 





Fig. 1511. 



Pteri/(jolus huffaloenns (Polilnian). Bertie Waterlinie (Silurian) ; Buflalo, Xew York. Restoration of 

 A, dorsal, and B, ventral aspect, i/ao O^'t'*'' Clarke and Ruedeniann). 



appendages on short legs, and telson as in Euryptenis. Epistoma lyre-shaped, 

 flanked by lateral shields. Ordovician and Silurian ; New York. 



Glyptoscorpius Peach. Body 

 attaining a length of 30 cm. 

 Surface covered with highly 

 developed scale-markings. The 

 animal is provided with a pair 

 of comb-like structures supposed 

 to resemble the pectines of 

 scorpions, and the legs end in a 

 double claw. Lower Carboni- 

 ferous • Scotland. 



Hastimima White. Large forms having a pterygotoid hastate telson with 

 impressed median ventral plate. Carboniferous ; Brazil, Nova Scotia (?) and 

 Devonian of South Africa. 



Fig. 1512. 



Pfe.rygoiU!< buffaloensis (Polilnian). Bertie Waterlime (Silurian) ; 

 Buffalo, New York. The toothed anterior chela, i/o. 



Order 4. LIMULAVA Walcott. 



Body elongated. Prosoma with lateral or viarginal eyes ; on the ventral side 

 with five pairs of appendages, some of which are hiramous. Postcephalic portion 

 of body (mesosoma and metasoma) consisting of twelve segments, the anterior nine of 



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