﻿414 



Revieios — Henry Woodward — 



appearance in time (so far as we liave been enabled to ascertain it) 

 of each order, and its recurrence in each successive formation. 





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Brachyura. — The oldest known Crab is the FalceinacTius longtpes, 

 H. Woodw., from the Forest Marble (Great Oolite), Wilts. The 

 Crabs are well represented from the Jurassic period to the present 

 day, when they attain their maximum development within the warm, 

 temperate, and subtropical latitudes, where land, freshwater, and 

 marine specimens abound. 



Anomura. — The Anomura embrace forms of Decapoda, both re- 

 lated to the Brachyura (e.g. Dromia, Porcellana, Dorippe, etc.) and 

 to the Macrura (e.g. Pagiirus, Galaihea, Munida). Their earliest 

 appearance is in the Cretaceous period. Numerous species of land 

 and marine Anomura are found within the tropics, and the marine 

 species occur very widely distributed in the colder seas of the 

 globe. 



Macrura. — Of this division of the Decapoda a single species, the 

 Antlirapalcsmon Grossartii, occurs in the Coal-measures, and is well 

 represented from the Trias to the present day. There are abundant 

 freshwater and marine, but no ZawcZ-dwelling Macrura. 



Stomapoda. — One species (the Pygocephalus Huxleyi, H. Woodw.) 

 from the Coal-measures probably is referable to this division. True 

 Squillas and Mysis-like Crustaceans occur in the Jurassic rocks. 

 They are most abundant in our modern seas, 



IsopoDA. — The remains of a single species of Isopod, Prcnarcturus 

 gigas, H. Woodw., have been obtained from the Old Red Sandstone 

 of Herefordshire, and other representatives occur in the Carboniferous 

 and Secondary rocks. The Isopod a are most widely distributed over 

 land and sea to-day — terrestrial, freshwater, and marine species 

 abound. 



Teilobita. — This extinct Order ranges from the Lower Cambrian 

 to the Carboniferous Series, more than 300 British species being 



