1 



762 



ARTHROPODA 



PHYLUM VTI 



on all five pairs of legs. All are blind and inliabit only the deep sea. The fossil 

 genera, however, include forms that lived in shallow water and probably possessed 

 eyes. The earliest is Tetrachela Eeuss, from the Upper Trias of Raibl. Eryon 



Vie. 14Tti. 

 Erymi ■iinijiiiiqn'U!< (.St-lilotli.)- Litliograpliie Stone ; Solenhofeii, Bav.aria. 



Vo. 



Desmarest (Fig. 1476), of which finely preserved specimens ai'e found in the Upper 



Jurassic Solenhofen Stone, ranges from the Lias (perliaps the Trias) to the Neocomian. 



Tlie Scyllaridea, which are distinguished, among other characters, by having the 



Fi(i. 1477. 

 Mecncliirus luniiiiiiiiiiiis (fichloth.). Ijithographic Stout' ; Eichstadt, Bavaria. i/.,. 



first pair of legs imperfectly chelate, include the Spiny Lobsters {Falinuridae) 

 and their allies. The earlier forms should j^robably all be referred to the 

 extinct family Glypliaeidae, of which, the first representatives occur in the Trias. 

 Pemfhix von Meyer (Fig. 1478) occurs in the Muschelkalk. Lithogaster and 

 GUjphaea von Meyer (Fig. 1479) range fi'om Trias to Cretaceous. Pseudogly^ilucn 



