CONTENTS 



Page 



Introduction 1 



Pendens as comparative material 2 



I. Skeletal and muscle systems 3 



A. Protoeephalon 3 



1. Eyestalks 7 



2. Antennules . 17 



3. Antennae 30 



4. Labrum 43 



B. Gnathothorax. 47 



1. Mandibles 60 



2. Paragnat ha 65 



3. Maxillae 66 



a First maxillae 66 



b. Second maxillae 69 



1. Maxillipeds 72 



a. First maxillipeds 72 



b. Second maxillipeds 74 



c. Third maxillipeds 81 



5. Pereiopods 87 



a. First pereiopods 87 



b. Fifth pereiopods 94 



C. Abdomen 103 



1. Pleopods 115 



2. Tail fan 125 



II. Nervous system 132 



A. Nerves of Supraesophageal ganglion and tritocerebrum 135 



B. Ventral nerve cord 139 



III Circulatory system 140 



A. Heart and pericardium 140 



B. Blood vessels of the body 140 



C. Appendicular blood vessels 148 



D. Venous system 149 



E. Respiratory system 149 



IV. Digestive system 150 



A. Foregut 150 



B. Midgut 154 



C. Hindgut 154 



X . Excretory system 155 



VI. Reproductive system 155 



Lit erat ure cited 160 



Bibliography 162 



in 



