INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 



Annelids. 



Page. 



Nereis virens 463 



N. limbata 463 



Bbynehobolus Ainericanus. 463 



E. dibrancliiatus 463 



Spio robustus 345 



Scolecolepis viridis. '.. 463 



S. tenuis 345 



Olymenella torquata . 

 Cistenides Gouldii . . . 

 Sabellaria vulgaris . . 

 Luinbriculus tenuis. . 



Clitellio irroratus 



Halodrillus littoralis. 



Nemerteans. 



Meckelia iiiffens 



Page. 

 349 



Meekelia rosea 



465 



Page. 

 343 

 323 

 321 

 463 

 463 

 463 



Page. 

 350 



MOLLUSCA. 



Gastropods. 



Page. 



Ilyanassa obsoleta 463 



Tritia tri vittata 463 



Eupleura caudata 371 



Astyris lunata 463 



Odostoinia trifida . . . . 



Bittinm nigrum 



Crepidula convexa 



Melainpus bidentatus 



Lamellibranchs. 



Page. 



Mya arenaria 463 



Macoma fusca 463 



Angulustener 358 



Tottenia gemma 359 



Venus mercenaria 463 



Laevicardium Mortoni 



Solenomya velum 



My tilus edulis 



Modiola plicatula 



Pecten irradians 



Page. 

 307 

 463 

 463 



463 



Page. 

 358 

 360 

 307 

 307 

 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 sufficieut 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- 

 S. Mis. 61 30 



