500 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



RADIATES. 



Behinoderms. 



Page. 

 Strofl gylocentrotus Diobachi-* 



en sis 490 



Asterias vulgaris 496 



Aca 

 Page. 



Clytia Johnstoni 408 



C. intermedia 408 



Orthopyxis caliculata 408 



Platypyxis cylindriea .... 408 



Campanularia volubilis 408 



C. flexuosa '. : 327 



Obelia geniculata ....... 496 



O. dichotoma 407 



O. flabellata 497 



•O. diapbana 327 



Page. 

 A. arenicola 326 



Cribrella sanguinolenta 496 



Opbiopbolis aculeata 496 



Page. 



Sertularia argentea 408 



S. cupressina 408 



Hydrall mania falcata 408 



riumularia, species 407 



Antennularia autennina 497 



Eudendrium ramosum 408 



E. dispar 408 



Pennaria tiarella . . 327 



Tbamnocnidia tenella 407 



Hydractinia polyclina 328 



Aleyoniuin carneum 



Metridium marginatum 



Polyps. 

 Page. I Page. 



. 497 Edwardsia lineata 497 



329 J Astrangia Danae 408 



PROTOZOA. 



Sponges 



Page. 



Chalina oculata 497 



Tedania, two species ........ 498 



Kenieria, species . 330 



Cliona solpburea .;. 421 



Page. 



Polymastia (?) 497 



Grantia ciliata . . : 33( 



Lencosolenia botryoides (?) . . 391 



IV. 4.— Fauna of the sandy and gravelly bottoms off the 



OPEN COAST. 



The bottom off the southern shores of Nantucket and Martha's Vine- 

 yard is sandy or gravelly over large areas, from low- water mark down 

 to 25 fathoms or more. Tracts of similar bottom occur off Cutty hunk 

 Island and farther west. In many of these, places, especially in the 

 shallower waters, near shore, the material of the bottom is nearly pure 

 siliceous sand, varying in fineness from coarse gravel to the finest sand, 

 and as these sands are generally loose and moved by the storm- waves, 

 in shallow water, their inhabitants are but few. In deeper water, at 

 depths of 20 to 25 fathoms or more, the material is usually a very fine 

 sand, often firmly compacted, and not infrequently mixed with more or 

 tevss fine mud. Such localities arc favorable for a much greater variety 



