36 G EEPORT^P^OMMISSIONER OF FlSH AND FISHERIES. 



Bryozoa and AsckUans. 



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Molgula Manbattensis 361 Bugula tiurita 361 



Escliarella variabilis 361* 



EADIATA. 



Uchi)iodcr))is. 



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Tbyoue Briareus 362 Ecbiuaraebnius paruui 362 



Candiua areiiata 362 Asteiias areuicola 363 



Leptosyuapta Giraidii ...... 361 Opbiuia olivacea 363 



L. roseobi 362 



Polyps. 



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Halocampa producta 363 | Sagartia leucoleiia 363 



Sagartia inodesta 363 Paiaotis rapiforinis 363 



II. 3. — FAUXA OF THE MUDDY SHORES OF THE BAYS AX'D SOUNDS. 



Tbe muddy shores in this region grade almost insensibly into tbe sandy 

 shores ; and shores thatare entireh' of mud, witbout any admixture of flue 

 sand, rarely occur except in the estuaries and higoous. Tberefore we 

 find, as might have been anticipated, that it is difficult to draw a very 

 definite line between the animals living upon the sandy shores and those 

 living upon the muddy shores and fiats. Many of the species seem, also, 

 to be equally at home, whether living in mud or sand, and many others 

 prefer a mixture, although capable of living in either. But if we were 

 to compare the animals living in pure sand with those living in clear 

 mud, tbe two lists would be quite different, although a considerable 

 number would be common to both lists. Moreover, tbe eel-grass grows 

 in considerable quantities both upon sand^' and muddy shores, in cer- 

 tain localities, and a large number of species which inhabit the eel-grass 

 will, therefore, be found in both lists. 



In discussing the species found on sandy shores, in tbe preceding 

 Images, references have constantly been made to other stations inhabited 

 by many of tbe species, and especially in tbe case of those that are com- 

 mon to tbe sandy and muddy shores. Tberefore it will not be necessary 

 to repeat the facts in this connection, but tbe species will be enumerated 

 in the list at the end of this section. 



A considerable number of species have tbeir place in this list chiefly 

 because they occur on beds of oysters planted on muddy shores, at and 

 just below low-water mark. Without tbese artificial stations sonje of 

 them would hardly be found on such shores, or at least but rarely. It 

 is evident that the shells of oysters, wben in large quantities, supply, to 



