xiv CONTENTS. 



Agelacrinidae Characters of the Ophiuroidea General struc- 

 ture of an Ophiuroid Their distribution in time, . . 244-259 



CHAPTER XIV. 



Characters of the Crinoidea General structure of the skeleton of a 

 Crinoid Distribution of the Crinoidea in time Families of 

 the Crinoidea, . . *. 260-283 



CHAPTER XY. 



Characters of the Cystoidea Structure of the column, calyx, and 

 appendages of the Cystideans Pectinated rhombs Distribu- 

 tion of the Cystideans in time Chief genera of Cystoidea 

 Pasceolus Sphserospongia Nidulites Cyclocrinus Charac- 

 ters of the Blastoidea Structure of Pentremites Distribution 

 of Blastoidea in time Characters and distribution in time of 

 the Holothuroidea Literature of Echinodermata, . . 286-307 



CHAPTER XVI. 



Characters of the Annulosa Characters of the Annelida Characters 

 of the Tubicola Distribution of the Tubicola in time Cornu- 

 lites Conchicolites Serpulites Trachy derma Spirorbis 

 Serpula Ditrupa Characters of the Errant Annelides Scol- 

 ithus Arenicolites Tracks of Errant Annelides Myrianites 

 Origin of supposed Annelide tracks Literature of Annel- 

 ida, . . ...... . . 308-326 



CHAPTER XVII. 



Characters of Arthropoda Distribution of Arthropoda in time 

 Characters of Crustacea Morphology of a typical Crustacean 

 General facts as to the past existence of Crustacea Table of the 

 divisions of the Crustacea Characters and divisions of the Cir- 

 ripedia Structure of the shell in the Balanidse Distribution 

 of the Balanidse in time Characters and distribution of the 

 Verrucidse Structure of the Pedunculated Cirripedes Dis- 

 tribution of the Lepadidse in time, 327-340 



CHAPTER XVIII. 



Characters and orders of the Entomostracous Crustaceans Ostra- 

 coda Distribution of the Ostracoda in time Estheria Char- 

 acters and distribution in time of the Phyllopoda Characters 



