FRESH WATER POLYPE (HYDRA) 



PLATE A' 



Fig I Mydra- xTrtdis 



or Cmrurum^ HydJUl. /--^ 



Fig 2 Hydra ftLsca. 



or L oruj iTTTTied- Bydrv- 



Ola^r>am I. Longitudinal Section 

 of Hydra. 



enltuit^ 



Fi$. 4- Endoderm. cell 



F 1 6 3 Cdls of the F.ctodfrm 



IhtdeiLS -^ 





.'iibres 



Fi*.7 Mipe Spa-mato^fOn. ^ Ovurrvoi* 

 ffydra liruiu 



Sp crrruiteTzoon- 



OfT-mmal ve-ru'2e 

 "y.Oermiruil Spi't 



S&fTTwrUeti tntun so-called 'e^ff' 



Diagram 2- Development of Hydrozoa 



C Seitwn "/' rianulcL 



b SeaXan of Morula 



' •OrrTTujiaL 



iGerminat spot 



d Sfj-'tivn. of &astrtda 



o I — \ClIui/ 



. Entoderm.' wiih /j2ia> 



EARTH-WORM (LUMBRICUS TERRESTRlS) 



Fig 2._Thefifteen Anterior Segments -Ventral aspect ^^^.^ 



Fig I - £tirthwoiT7v 



Mcuth 



*Sf^rne7tt 



'tJpcruTi^ I'/'Se^ntenaiZ 

 arxfan. 

 '■^jTitemal pozr of SetoJt 



''Exi^rrtcO' pair of'>'eiae 



Opemrttf of OvidxLct' 

 'Opening o*' Var ^e/ereru 



"'OpaUTUf* of 



Sperm/i^eca€- 



■iVlAKJohn»wn, Hamburg 1 London. 



