84 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [378] 
Lamellibranchs. 
fo} 5 
Pholas, truncata. +. <.....- oi2 | Venus mercenaria... ..... 372 
Tagelus gibbass-:-....... ~ oie | Kellia planulatas....-. ese oT 
Mya arenaiid ee ce = oe os ws: dia | Argina pexata.<-¢.6..-e5e 372 
Mulinia lateralis........... 340. behiytilus ednlise 2.5 cee oes 312 
Macomafasea. 2.2... =. +. =. 3/2 | Modiola plicatula.......:.. o74 
Cumingia tellinoides. .-.--. oi 4) Meshamatas .. - ene ota O74 
AMeEMUS TENET. - =... <2 - d(2°| IPecten 1fradians eee- 2 O74 
Petricola pholadiformis..-. 372 | Ostreea Virginiana .....--. O74 
Ascidians. 
Page. Page. 
Molgula Manhattensis. .-.- aio, | Botryllus.Gouldi..- 255). -ouel 
RADIATA. 
Hehinoderms. 
Page. Page. 
Thy one BriareuS?.- o--- =o: 376 | Asterias arenicola.......-- oT 
Acalephs. 
Page. | Page. 
Hydractinia polyclina.....- 3(6 | Halecium gracile....... 2. 376 
IJ. 4.—ANIMALS INHABITING THE PILES AND TIMBERS OF WHARVES 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; but as these plants require light, they are found almost exelu- 
sively upon the outer rowsof piles and timber, and are most abundant on 
the outer side of the piles and on the southern exposures, where they get 
the most sunlight. These algve afford congenial homes to a considerable 
number of animals, most of which occur also among alge on the rocky 
shores and in tide-pools, Beneath the wharves, where the piles are con- 
