INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 4(;5 



Annelids. 



Nereis vireus 



N. limbata 



Khyncbolbolus Americanus. 

 E. dibraiieliiatus 



Page. 

 463 

 463 



Pace. 



Clymenella torquata 343 



Cisteuides Gouldii 323 



463 Sabellaria vulgaris 321 



463 



Spio robustus 345 



Lumbricnlus tenuis 463 



Clitellio irroratus 463 



Scolecolepis viridis. - 463' HalodriHus littorabs 463 



S. tenuis 345 



Meekelia ingeus 



Nemerteans. 



Page. [ 

 349 i Meckelja rosea 



Page. 

 350 



MOLLUSCA. 



Gastropods, 



Page. 



ilyanassa obsoleta 463 



Tritia trivittata 463 



Eupleura caudata 371 



Astyris lunata 463 



Page. 



Odostomia triflda 



307 



Bittium nigrum 463 



Crepidula convexa 463 



Melampus bidentatus 463 



LamelUbranchs. 



Page. 



Mya areuaria 463 



Macoma fusca 463 



Angulus tener 358 



Tottenia gemma 359 



Venus mercenaria 463 



Page. 

 Li^vicardium Mortoni ..... 358 



Solenomya Yehmi 360 



My tilus edulis 307 



Modiola i^licatula 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- 

 M'ater 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 snfiicient power to remove the fine sediments. The ujiper 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- 

 S. Mis. 61 30 



