378 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



LameUihranchs. 



Page. 



Pholas trnucata 372 



Tagelus gibbus 373 



Mya areuaria 372 



Mulinia lateralis 373 



Macoma fiisca 372 



Oumiugia tellinoides 374 



Angulus teuer 372 



Petricola plioladiformis 372 



Page. 



Yenus mercenaria 372 



Kellia plauulata 374 



Argiua pexata 372 



My tilus edulis 372 



Modiola plicatula 374 



M. hamatus. 



Pecteii irradians 



Ostr^ea Tirciniana 



Ascidians. 



Page. I 

 Molgala MauLattensis. .... 375 I Botryllus Gouldii 



RADIATA. 



JEclimoderms, 



374 



374 



374 



age. 

 375 



Page. 

 Tbyone Briarens 376 



Page. 

 Asterias areiiicola 376 



AcaJephs. 



Page. 

 Hydractinia polycliua 376 



Page. 

 Halecium oracile 376 



II. 4. — ANIMALS INHABITINa THE PILES AND TIMBERS OF WHAEYES AND 

 BRIDGES, BOTTOMS OF VESSELS, BUOYS, AND OTHER SUBMERGED 

 WOOD-WORK. 



In these situations a large number of species may be found, but the 

 majority of them are not peculiar to such stations. There are, however, 

 quite a number of species that are nearly always found under these cir- 

 cumstances, and others are directly dependent for their very existence 

 upon submerged wood. Some of these, like the Teredo, for example, are 

 of so great importance, owing to the injuries which they do to valuable 

 property, that it seems desirable to make a special division for the 

 animals ordinarily found in connection with wood-work of various kinds, 

 whether injurious or not. 



On the piles of wharves and bridges various kinds of sea- weeds often 

 grow in abundance, each species having a particular zone to which it is 

 limited 5 but as these i)lants require light, thcj are found almost exclu- 

 sively upon the outer rowsof piles and timber, and are most abundant on 

 the outer side of the piles and on t\\G southern exposures, where they get 

 the most sunliglit. These alga', afford congenial homes to a considerable 

 number of animals, most of which occur also among alga^ on the rocky 

 shores and in tidc-imols. P>cneath the wharves, where the ])iles are con- 



