ARTHKOPODA, 



xiii 



CLASS VI. CYCLOSTOMA. 

 LAMPREYS AND HAG-FISHES. 



Characteristics of Cyclostoma 



Page I 

 523 I Lampreys and Hag-fishes ... 



Page 

 5 2 4 



CLASS VII. PROTOCHORDA. 



SUB-CLASS I. CEPHALOCHORDA. SUB-CLASS II. UROCHORDA. 



The Lancelet ... ... ... 526 J The Common Sea-squirt, Etc. ... 527 



CLASS VIII. HEMICHORDA. 



Hemichorda or Enteropneusta ... 528 | The Balanoglossus ... 



SUB-KINGDOM II. ARTHROPODA. 



CRUSTACEA, INSECT A, 



CLASS I. CRUSTACEA. 



Characteristics of Arthropoda ... 529 

 Edible Arthropoda, Etc. ... ... 530 



SUB-CLASS I. ENTOMOSTRACA. 



The Smaller Crustacea 531 



Order I. Phyllopoda. 



The Water-flea, Etc 531 



Order II. Ostracoda. 



The Ostracoda 532 



Order III. Copepoda. 



The Cyclops, Carp-lice, Etc. ... 532 

 Order IV. Cirripedia. 



Barnacles, Etc. ... ... ... 533 



SUB-CLASS II. MALACOSTRACA. 



The Higher Crustacea 533 



Order L Arthrostraca. 

 Sub-order i. Isopoda. 



Wood-lice, Etc 534 



Sub-order ii. Amphipoda. 



The whale-louse, Etc 534 



Order II. Thoracostraca. 

 Sub-order i. Cumacea. 



Marine Parasites, Etc. ... .. 535 



Sub-order ii. Stomatopoda. 



Squilla Mantis, Etc. ... ... 535 



Sub-order iii. Schizopoda. 



Shrimp-like Crustacea 536 



Order III. Decapoda. 

 Sub-order i. Macrura. 



Shrimps, Lobsters, Crayfish, Etc. 536 

 Sub-order ii. Anomura. 



Robber Crabs, Hermit Crabs, Etc. 537 

 Sub-order iii. Brachyura. 



The Spicier Crab, Etc. ... ... 537 



SUB-CLASS III. GIGANTOSTRACA. 

 Order Xiphosura. 



The King-crabs 538 



SUB-CLASS IV. PYCNOGONIDA. 

 Order Pycnogonida ... ... 539 



CLASS II. ARACHNIDA. 

 SPIDERS, SCORPIONS, AND MITES. 



Order I. Scorpionidea. 

 The Scorpions, Etc. 



540 



Order II. Solpugidea. 

 Galeodes Arabs, Etc. 



541 



