XIl] CLASSIFICATION 279 



Division i. Euphausidacea. [Classed by Caiman as Eucarida.] 

 Schizopoda with ramified liver and carrying the 

 eggs on swimmerets. 

 Ex. Euphausia. 



Division ii. Mysidacea. [Classed by Caiman as Peracarida.] 



Schizopoda with single tubular liver and carrying 

 the eggs in a brood chamber protected by oostegites, 

 Ex. Mysis, 



Sub-order ii. Decapoda. [Eucarida.] 



Thoracostraca in which the last five thoracic ap- 

 pendages uniramous and used for walking. 



Division a. Macrura. 



Abdomen long. 

 Ex. Astacus. 



Division b. Anomura. 



Abdomen of moderate length, last one or two 

 pairs of thoracic legs short and inserted higher up on 

 the side of the body than the rest. 



Ex. Pagurus. 



Division c. Braehyura. 



Abdomen short, devoid of tail fin. 

 Ex. Cancer, Carcinus. 



Sub-order iii. Stomatopoda. [Hoplocarida.] 



Thoracostraca in which the carapace is reduced in 

 length leaving the last thoracic segments free. The first 

 five pairs of thoracic appendages developed into grasping 

 organs called " maxillipedes." Abdomen large and bearing 

 gills on its appendages. 



Ex. Squilla. 



Sub-order iv. Cumacea. [Classed by Caiman as Peracarida.] 



Thoracostraca in which the carapace is reduced leaving 

 four or five thoracic segments free. Two pairs of true 

 maxillipedes. Eyes fused into one immovable almost 

 sessile eye. 



Ex. Cuma, Diastylis. 



Order 3. Arthrostraca. [Peracarida.] 



Malacostraca in which the carapace is absent. One or 

 rarely two thoracic segments fused with the head, the rest free. 

 Eyes sessile. 



