FRESH WATER POLYPE (HYDRA) 



PLATE X 



Fig. I Jlydra, virij&f 

 or Common. 



F i g. 2 Hydra, 



or Long arn^ed. BydrpL. 



Diagram I. Longitudinal Section 

 of Hydra. 



F i . 7 Ripe. Sperm attf'i-i'Ons <: Ovurri< of 





Diagram 2._ Development of Hydrozoa 



Cr.Se/&L0n- 



b .Stftian* afMamloj 



d>. Section- ofjrastndas 



.Endoderm' -with, 



EARTH-WORM (LUMBRICUS TERRESTRIS) 



Fig 2._Thefi'f\een Anterior Segments -Ventral aspect 



- 



Fig I. _ Sarthwornv 



"W iA.K.JolinsToji. Edinburgh t Londoi 



