356 



ARTICULATA: CRUSTACEA. 



the name of this order is called Deeapoda, from the Greek 

 deka, ten, and^w<.<?, podos, foot. 



The Deeapoda, as regarded by Dana, are essentially equivalent to 

 the Podoplithalniia of authors (from the Gr. poits, podos, foot, and oph- 

 t/talmos, eye the eyes being on movable footstalks), and include not 

 only the typical Decapods Brachyurans, Anomourans, and Macrou- 

 rans (Figs. 480-485) but they also include the Schizopods (from the 

 Gr. schizeiii, to divide, and pous, podos, foot the legs having each an 

 accessory-jointed branch, as in Mysis, Fig. 488), and the Stomapods 

 (Squitta, Fig. 487). 



The typical Decapods, or best representatives of the 



FIG. 480.* 



Crab, riatyoniclius ocellatus, Latr. 



group, have nine segments belonging to the head, and six 

 pairs of appendages in the oral apparatus (Fig. 479). 

 The Crabs, of which there are many families, are re- 



* Figs. 480, 484, 488, 489, 491, 493, and 501, are, by permission, from the 

 " Report upon the Invertebrates of Vineyard Sound and Adjacent Waters," 

 by A. E. Verrill and S. I. Smith. 



