Photo. D. P. Wilson. 

 Heart Urchin (Echinocardiuju cordatum), x|. (pp. 39, 63, 66). 



PL 20. 



/'■.•■', n. p. Wilson 



^56. 



Soider Crab (Inackus Dorsettensls), covered with sponge, and Notched 

 Wrack (Fucus serratus) with attached hydroids iSertularia) and polyzoan 



(Alcyonidium), xf. (p. 63). 



