TABLE OF CONTENTS. 



Platks IX.-XII. Develupment of Eciiinoidea. Figures IVnm Alexander Ar.ASSiz, Wilhelm Busch, J. W. 



From E. Selenka. 



W. BlTSCH. 



Johannes Muller. 



J. W. Fewkes. 



Alexander Aoassiz. 



H. Garman and B. P. Colton. 



Alexander Agassiz. 



A. Krohn. 



Johannes JIuller. 



Alexander Agassiz. 

 Johannes Muller. 



From .\lexander Agassiz. 



Wyville Thomson. 

 Alexander Agas.siz. 



Plates XIII.-.W. Development of HoLOTurnoiPMA. Figures from D. C. Danielssen and J. Koren, Elias 

 Metschnikoff, Johannes Muller, and Emil Selenka. 



Plate .\ 1 1 1. — 1-11 Synapta — Auricularia with calcareous vhech Fr 



12-17 Synapta (continued) 



18 Auricularia wilh calcareous gland . 



19 Auricularia with eleven spheres 

 20-32 Atiricularia with clastic spheres 

 33-37 Auricularia with dendritic anal gland . 



YhATEWV.— 1-12 ffolothuriatubulosa 



1 3-27 Jlolothuria tremula 



Plate XV. — 1-13 Cucumaria doliolum 



14-27 Homologies of Echinoderm Larvae . 



om Johannes Muller. 

 E. Metschnikoff. 

 Johannes Muller. 



E. Selenka. 



D. C. Danielssen and J. Kouen. 



E. Selenka. 

 Johannes Muller. 



