ARTHKOPODA. 



CLASS VI.— CYCLOSTOMA. 

 LAMPREYS AND HAG-FISHES. 



Characteristics of Cj'clostoma 



Page I 

 523 I Lampreys and Hag-fishes ... 



Page 

 524 



CLASS VII.— PROTOCHORDA. 



Sub-Class I.— Cephalochorda. I Sub-Ci.ass II. — Urochorda. 



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



CLASS VIIL— HEMICHORDA. 

 Hemichorda or Enteropneusta ... 528 | The Balanoglossiis ... 



528 



SUB-KINGDOM II.— ARTHROPODA. 



CRUSTACEA, INSECTA, &-(. 



CLASS I.— CRUSTACEA. 



Characteristics of .\rihronoda ... 529 



Edible Arihropoda, Etc 530 



SuB-Ci.ASS 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 I. — Arthrottraca. 

 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-Older iii. — Brachyura. 



The Spider Crab, Etc. ... ... 537 



Sub-Class III. — Gigantostraca. 

 Order Xiphosura. 



The King-crabs ... ... ... 538 



Sub-Class IV. — Pycnogonida. 

 Order Pycnogonida ... ... 539 



CLASS IL— ARACHNIDA. 

 SPIDERS, SCORPIONS, AND MITES. 



Order I. — Scorpionidea. 

 The Scorpions, Etc. 



540 



Order II. — Solpugidea. 

 Galeodes Arabs, Etc. 



.541 



