SEA-FISHERIES LABORATORY. 



293 



" Histoire naturelle des Crustaces," Milne- Edwards 

 named it Platycarcinus pagurus. This latter name appears 

 to have been retained in many continental works up to 

 quite recent years. 



I have followed the classification of Borradaile,* and 

 I give below a table compiled from the results of his work. 



Crustacea Decapoda 



I 



Natantia 



I 



Reptantia 



i i i i 



Palinura Astacura Anomura Brachyura 



i 



Oxystomata 



Droniiacea 



Brachygnatha 



~7~ 



I 



Oxyrhyncha 



Brachyrhynca 



~ — "■ 



(sub-orders) 



(tribes) 



(sub-tribes) 



(super-families) 



(families) 



I I I 



Corystidae Portimidae, etc. Cancridae 



~T~ 



Pirimelinae Cancrinae (sub-families) 



Cancer (genus) 



The main characters of the various divisions of the 

 Decapod Crustacea are given below. t 



Natantia. — Rostrum well developed and compressed. 

 Body compressed. First abdominal somite equal 

 to rest. Stylocerite present. Second antennal 

 scale large. In the legs basis and ischium 

 never fused, and one fixed point in the carpo- 

 propodal articulation. Male genital opening 

 arthrodial. Abdominal limbs 1-5 well developed 

 and used for swimming-. 



* Borradaile, L. A. " On the Classification of the Decapod 

 Crustaceans." Ann. and Mag. Nat. Hist. (7), Vol. XIX, June, 1907. 



f These characters are abstracted from Borradaile 's paper. 



