58 



CLASSIFICATION OF THE ANIMAL KINGDOM. 



ORDER II. DECAPODA. 



Tribe 1. Macrura. 



Fam. a. Diastylidee. Diastylis (= Cuma). 



Fa.ro. J. Penseidse. Penceus. 



Fam. c. Candidas Pcdcemon (Prawn), Pandcdus, Hippo- 

 lyte, Alpheus, Crangon (Shrimp). 



Fam. d. Astacida?, Astacus (Cray-fish), Homarus (Lob- 

 ster), Nephrops (Norway Lobster). 



Fam. e. Palhmridse. Scyllarus, Palinurus (Spiny Lob- 

 ster), *Eryon. 



Fam./. Thalassinida?. Calianassa, Thalassina. 



The family DiastylidtE is often regarded as a special subdivision of the 

 Crustacea, under the name of the Cumacea. 



Fig. 53. Syuilla mantis, the Locust 

 Shrimp. 



Fig. 54. The Common Cray-fish (Astacus fluri- 

 atilis), viewed from below: a, Antennules; 6, 

 Large antenna ; c, Eyes ; d, Opening of antennary 

 gland; e, Last pair of foot-jaws;/, One of the great 

 chelse ; g, Fifth thoracic limbs ; h, Swimmerets ; 

 i, The last pair of swimmerets ; j. The opening 

 of the anus below the telson. 



