i 



TIIK DAWN OF LIFE 



173 



strong reasons have been assijjned for g\vin<r them 

 an intermediate place, as aUied to those curious 

 communities of humble animals possessin^c,' simple 





^fit:J;•i>A:|;^••••••■'^•:v;<;^■•^•;^^^/•^•'•'^ 



••JJ.V:'. 



^* •*• • < '•••'Ai.VA'Vf.r'V-* - 

 Fig. 44. — Structures of Stromatofota. 



GuarL^°!rl\°Th;°i!'''''li^'^''-'""- <^> Wall with pores, and coated with crystals of 

 quartz, (c) Thickened portion of wall with canals, {d) Lamina; and pilla 



lars. 



stomachs and prehensile tentacles (Hydroids) which 

 form some of the simpler corals (Millepores, etc.), 

 and the crusts (Hydractiniae) which cover dead 

 shells and other bodies in the sea. When examined 



