TABLE OF CONTENTS. 



Paoe. 



INTRODUCTION 9 



HISTORICAL REVIEW H 



GENERAL FEATURES, iMETHUDS, 



ETC 19 



External Characters 19 



Internal Anatomy 19 



Methods '22 



Occurrence 23 



Mode of Life, Food 24 



Color, .Size 25 



Lenoth Index 2(') 



COMPARATIVE ANATOMY .... 20 



Foot and Glands 26 



Hypodermis and Product.s .... 27 



Spicule Development 2<S 



Digestive Tr.yct 32 



Muscular Sy'.stem 32 



Primary Body Cavity and Septa . 33 

 Circul.\toky and Respir-vfoky Sys- 

 tems 33 



Nervous System 34 



Sense Organs 36 



Coelo.m 37 



Physiology 38 



CLASSIFIC.VTION 41 



Aplacophoha 42 



Chaetodermatidae 42 



Chaetoderma 43 



Limifossor 44 



Neomeniidae 44 



Drepanomonia 44 



Pachymenia 45 



Proneonieniidao 45 



Proneomrnia 45 



Driomenia 45 



Dorymenia 46 



Strophomenia 46 



Pruvotiniidae 47 



Lophomenia 47 



Alp.xandromenia 47 



Halomenia . 

 Dondersiidae 



Herpomenia 



Dondersia . 



Ichlhyomenia 

 DESCRIPTION OF SPECIES 

 Chaetoderma hawaiicnsis 

 C. attenuata .... 



C. enidita 



C. montereyensis . . . 

 C. argeiitea .... 



C. scabra 



C. californica .... 



C. nanula 



C. japonica 



C. robusia 



Liniifo.s.sor taliioideus 



L. frafula 



Pacliyinenia aby.s.soruiii 

 Diepanoinenia vampyrcUa 

 Proneoraenia hawaiicnsis 

 P. insuhiris .... 

 Driomenia pacifica 

 Dorymenia acuta . . 

 St rophomenia scantlens 

 S. ophidiana .... 

 S. regularis .... 

 S. farcimen .... 



S. spinosa 



S. triangularis .... 

 Lophomenia spiralis 

 Alexandroinenia agassizi 



A. valida 



Halomenia gravida 

 Herpomenia platyi)oda . 

 Dondersia californica 

 Ichlhyomenia porosa 

 GENERAL CONSIDERATIONS 

 BIBLIOGRAPHY .... 

 EXPLANATION OF PLATES 



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