INDEX. 



157 



Pentacta frondosa, 



Pleurobrachia rhododactyla, 



Polyps, ~^ 



Ptychogena lactea, i 



Physalia Arethusa, 



Radiates, 



Rhodactinia Davisii, 



Sarsia, 



Sea-iirchin, 



Sertularians, 



Solaster endeca, 



THE END. 



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



