CONTENTS. XV 



characters of the Blastoidea — Morphology of the Blastoids— 

 Distribution of the Blastoids in time — Classification of the 

 Blastoids — Table of the families and genera of Blastoids — 

 Literature of Echinoderms, 447-467 



CHAPTER XXVII. 



General characters of the Annulosa — Supposed remains of fossil 

 Entozoa — Characters of the Anarthropoda — Gephyrea — Myzos- 

 tomida — Characters and distribution in time of the Annelida — 

 The Tubicolous Annelides — The Errant Annelides — Trails and 

 tracks, 468-490 



CHAPTER XXVIII. 



General characters of the Arthropoda — Distribution of the Arthro- 

 poda in time — General characters of the Crustacea — Morphology 

 of the Crustacea — Classification of the Crustacea — Distribution 

 of the Crustacea in time — General characters of the Cirripedia — 

 Divisions of the Cirripedia — The Balanidse — Verrucidae — Lepa- 

 didae, 491-502 



CHAPTER XXIX. 



General characters of the Entomostraca — The Lophyropoda — Gen- 

 eral characters of the Ostracoda— Types of Ostracodes — General 

 characters of the Copepoda — The Branchiopoda — General char- 

 acters of the Cladocera — Characters and chief types of the 

 Phyllopoda — Characters and types of the Phyllocarida — Gen- 

 eral characters of the Trilobita — Systematic position and dis- 

 tribution in time of the Trilobites — Families of the Trilobites — 

 The Merostomata — General characters of the Xiphosura — Types 

 of the Xiphosura — Hemiaspidae — Limulidae — General charac- 

 ters of the Eurypterida — Systematic position and distribution of 

 Eurypterids — Types of the Eurypterida, .... 503-555 



CHAPTER XXX. 



General characters of the Malacostraca — Hedriophthalmata — ■ 

 Amphipoda — Isopoda — Thoracostraca — Cumacea— Schizopoda 

 — Stomatopoda — Decapoda — Macrura — Anomura — Brachyura 

 — Literature of Crustacea, 556-571 



CHAPTER XXXI. 



General characters of the Arachnida — Distribution of the Arachnida 

 in space and time — Acarida — Anthracomarti — Adelarthroso- 



