3. A yellow branching sponge, 

 AxincUa, and an irregular red- 

 dish-orange sponge, Pohjmtistia, 

 are both common in the shore 

 waters off South Devon, Eng- 

 land, at depths of sixty feet or 

 more. (D. P. Wilson) 



4. The club-headed hydroid, 



Clava squamata, forms little col- 

 onies on shore seaweeds. The 

 inch-long pink polyps stretch 

 their tentacles to ensnare small 

 prey. (England. D. P. Wilson) 



5. A colony of oaten-pipes hv- 

 droid, Tubularia larynx. It gets 

 its name from the yellowish 

 tubes that encase the stems hold- 

 ing aloft the many flower-like 

 but carnivorous polvp "heads." 

 (England. D. P. Wilson) 



6. A hydrozoan medusa, Pohjordiis. common on the American Pacific coast, is shown 

 here about three times natural size. The trumpet-shaped feeding tube, with the mouth 

 at its tip, is mosth' obscured by the stringlike se.x organs. At the bases of the tentacles 

 are pigmented sense organs. (Woodv Williams) 



