ANIMAL LIFE 175 



own peculiar assemblage of fishes and inverte- 

 brate animals. On the bare rock, for instance, 

 we find barnacles, mussels, limpets, and peri- 

 winkles ; on the sea- weeds we find attached 

 forms like sponges, hydroids, bryozoans, 

 serpulids, actinians, and ascidians, along with 

 caprellids, pycnogonids, nudibranchs, worms, 

 starfishes, and brittlestars ; on the sandy 

 bottom we find burrowing forms like mussels, 

 asterids, spatangids, worms, crustaceans, lance- 

 lets and sand-eels ; on the hard bottom we 

 find attached and non-attached forms like 

 sponges, bryozoans, hydroids, corals, gor- 

 gonids, alcyonarians, ascidians, chitons and 

 other molluscs, brachiopods, crustaceans, brit- 

 tlestars, starfishes, echinids, crinoids, holo- 

 thurians and worms ; on the muddy bottom 

 we find principally burrowing forms, including 

 rhizopods, mussels, scaphopods, pennatulids, 

 holothurians, crustaceans, actinians, worms 

 and sponges. 



In the shallow-water zone we find holo- 

 thurians, starfishes, brittlestars, worms, brachi- 

 opods, mussels and other molluscs, crusta- 

 ceans, corals, gorgonids, actinians, echinids, 

 hydroids, bryozoans, ascidians^ and sponges. 

 Just where the fine detrital matter from the 

 land and shallow-water comes to rest on the 

 sea-floor, a great feeding ground exists, where 

 crustaceans and other animals pick up the 



