XU CONTENTS 



Platyhelminthes {Continued). page 



Nemertinea 57 



Tetrastemma 57 



NEMATHELMINTHES 59 



Ascaris 59 



Trichinella 60 



TROCHELMINTHES 62 



ROTIFERA 62 



Brachionus (A Rotifer) 62 



MOLLUSCOIDA 64 



POLYZOA 64 



Bugula 64 



Plumatella 66 



Brachiopoda 67 



Terebratulina 67 



ECHINODERMATA 68 



ASTEROIDEA 69 



Asterias (Starfish) 69 



Ophiuroidea 75 



Ophiura (Serpent-Star) 75 



ECHINOIDEA , 76 



Strongylocentrotus (Sea-Urchin) 76 



HOLOTHTJROIDEA 83 



r . , Thyone (Sea-Cucilmber) 83 



ANNELIDA. 87 



Ch^topoda 88 



Nereis virens (Clam- Worm) 88 



Autolytus cornutus 92 



Lepidonotus (Polynoe) squamatiis 93 



Diopatra cuprea 94 



Chsetopterus 95 



Ainphitrite ornata 96 



Cistenides (Pectinaria) gouldii 97 



Clymenella torquata 97 



Arenicola cristata 98 



Sabella microphthalma 98 



Hydroides 99 



Spirorbis 99 



Lumbricus (Earthworm) 100 



Macrobdella (Leech) 105 



Gephyrea 109 



Phascolosoma 109 



MOLLUSCA 112 



Lamellibranchiata 114 



Venus mercenaria (Quahog) 114 



Yoldia Hmatula 123 



Mytilus or Modiolus (Mussels) 124 



Pecten gibbus borealis (Scallop) 125 



Ostrea virginiana (Oj^ster) 126 



Solemya. . 127 



Mya arenaria (Long Clam) 128 



Ensis directus (Razor-shell Clam) 129 



