[4<>f>] INVKItTKI'.l.'ATK ANIMALS OF VINKYAK'I) SolXI), ETC. 171 



Annelids. 



Nereis vireus 



N. limbata 



Khyuchobolus Americanus. 



E. dibranchia-tus 



Spio robustus 



Page, 

 463 

 463 

 463 

 463 

 345 



Scolecolepis viridis. 463 



S. tennis.. 345 



Page, 



( /lymenella torquata : i:> 



Cistenides Gouldii :;L'.; 



Sabellaria vulgaris .Ji'l 



Lumbriculns tenuis 463 



Clitellio irroratus 463 



Halodrillus littoralis . . . 463 



Meckelia ingeus 



Nemerteans. 



Page, j 



349 j Meckelia rosea 



MOLLTJSCA. 

 Gastropods. 



Page, 



350 



Page. I 



Ilyauassa obsoleta 463 j 



Tritia trivittata 463 ' 



Eupleura caudata 371 



Astyris lunata 463 



Page. 



Odostomia trifida 307 



Bittium uigrum 463 



Crepidula couvexa 463 



Melampus bidentatus 463 



LamelUbranchs. 



Page. 



My a arenaria 463 



Macoma fusca 463 



Angulus tener 358 



Tottenia gemma 359 



Venus mercenaria. . 463 



Page. 

 LaBvicardium Morton! . 358 



Solenomya velam 



360 



My tilus edulis 307 



Modiola plicatula 307 



Pecten irradians 



361 



III. 2. ANIMALS INHABITING THE MUDDY SHORES AND BOTTOMS OF 



BRACKISH WATERS. 



The bottoms of the sheltered estuaries, ponds, and harbors, are almost 

 invariably muddy, throughout the greater part of their extent, from low- 

 water mark to their greatest depths, or, in other words, wherever the 

 waves do not act with considerable force. The shores between tides are 

 also muddy in the more protected localities, where the waves do not 

 have sufficient power to remove the fine sediments. The upper and nar- 

 rower parts of nearly all the estuaries in this region are, on this account, 

 muddy, for the rapidity of the tide is seldom sufficient to entirely re- 

 move the fine sediments brought down by the streams. 



A large part of the muddy bottoms is generally covered in summer by 

 extensive patches of eel-grass. Over other portions large beds of oys- 

 13 v 



