TABLE OF CONTENTS. 



Introduction 



Part I. 



Page 



9 



The Classification of the Apodous Holothurians H 



Table of Accepted Genera, with Type Species 23 



Part II. 



The Apodous Holothurians of the United States Xational iMuseum 23 



Svnaptidffi ^^ 



Molpadiidffi "^ 



Morphology 



Part III. — The Stnaptid.^:. 



43 



Form and Size ■ 



Color *^ 



Body-surface 



Tentacles 



r, 46 



Sense-organs 



Light-detecting 



Positional ^^ 



Gustatory 



Tactile ." *'^ 



47 

 Nervous System 



Body-wall ^^ 



48 

 Epidermis 



' 4S 



Connective-tissue Layer 



48 

 Pigment-cells 



Calcareous Deposits 



Anchors and Plates 



Wheels ^^ 



Curved Bods ^^ 



e -1 



Jliliary Granules 



Circular Muscles 



52 

 Longitudinal Muscles 



53 

 Inner Epithelium 



Body-cavitv 



" 53 



Calcareous Ring 



Cartilaginous Ring 



Water-vascular System 



Alimentary Canal 



Ciliated Funnels 



Blood System 



Reproductive System 



Embryology 



5 



