Pentacta frondosa, 



Pleurobrachia rhododactyla, 



Polyps, 



Ptychogena lactea, 



Physalia Arethusa, 



Radiates, 



Rhodactinia Davisii, 



Sarsia, 



Sea-urchin, 



Sertularians, 



Solaster endeca, 



INDEX. 155 



99 Star-fishes, 108 



27 Synapta tenuis, 95 



5 Systematic Table, 152 



86 Tima formosa, 60 



83 Toxopneustes drobachiensis, 101 



1 Trachynema digitale, 45 



13 Tubularia Couthouyi, 72 



68 Tubularians, 67 



101 Turris vesicaria, 69 



66 Velella mutica, 84 



114 Zygodactyla groenlandica, 57 



THE END. 



Cambridge : Stereotyped and Printed by Welch, Bigelow, & Co. 



