STALK-EYED CRUSTACEA 



Order I. Decapoda. 

 Order II. Stomapoda. 



Synopsis of the Orders. 



A. Gills internal. 



a. Head and chest form one piece. The limbs always 

 five pairs. — {Decapoda.) 



B. Gills external or wanting. 



b. Head and chest more or less in segments. The 

 limbs usually seven or eight pairs ; one or two posterior 

 pairs often wanting. — {Stomapoda.) 



Order I. Decapoda. 



Decapoda Latreille, White. 



Decapodes H. Milne Edwards. 



Decapoda vel EnhraiicJiiata . Miers. 



EubrancJiiata Dana. 



Having gills fixed on the sides of the thorax, and 

 covered in a cavity. The head soldered on to the chest, 

 and covered with a carapace that reaches as far as the 

 abdomen. The limbs — walking and holding — almost 

 always five pairs. 



Suborder I. Brachyura. 

 Suborder II. Anomoura. 

 Suborder III. Macroura. 



Synopsis of the Suborders. 



I. Abdomen bent under the body, without swimming 

 appendages, and without appendages upon the under 

 surface of last seG^ment but one. Sternum broad. 



