ARACHNIDA— EURYPTERIDA 



785 



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

 telson. Siluriari ; Lanarkshire. 



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



Fig. 1511. 



Pterygotus buffaloensis (Pohlman). Bertie Waterlime (Silurian) ; BufFalo, New York, 

 A, dorsal, and B, ventral aspect. 1/30 (after Clarke and Ruedemann). 



Restoration of 



appendages on short legs, and telson as in Eurypterus. 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 

 impressed median ventral plate. 

 Devonian of South Africa. 



Fig. 1512. 



Pterygotus buffaloensis (Pohlman). Bertie Waterlime (Silurian) ; 

 Buffalo, New York. The toothed anterior chela. 1/2. 



i pterygotoid hastate telson with 

 Carboniferous ; Brazil, Nova Scotia (?) and 



Order 4. LIMULAVA Walcott. 



Body elongated. Frosoma with lateral or marginal eyes ; on the ventral side 

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

 of hody {mesosoma and metasoma) consisting of twelve segments, the anterior nine of 



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