206 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [r>00] 



RADIATES. 



Ecliinoderms. 



Page, j Pag. 



Strongylocentrbtus Drobachi- A. arenicola . . 326 



ensis 496 I Cribrella sanguinolenta 496 



Asterias vulgaris 496 | Ophiopholis aculeata 496 



Acalephs. 



Page. 



Clytia Johnstoni 408 



0. intermedia - 408 



Orthopyxis caliculata 408 



Platypyxis cylindrica ... 408 



Campanulari a volubilis ...... 408 



0. flexuosa 327 



Obelia geniculata 496 



O. dichotoma 407 



O. flabellata 497 



O. diaphana 327 



Page. 



Serial aria argeiitea 408 



S. cupressina 408 



Hyd rail mania falcata 408 



Plumularia, species 407 



Antennularia autennina 497 



Eudendrium ramosum 408 



E. dispar 408 



Pennaria tiarella 327 



Thamnocnidia tenella 407 



Hydractinia polycliua 328 



Polyps. 

 Page. 



Alcyoniuin carueum 497 



Meiridium marginatum 329 



Page. 



Edwardsia lineata 497 



Astrangia Daure 408 



PROTOZOA. 



Sponges. 



Page. 



Chaliaa oculata 497 



Tedania, two species 498 



Eenieria, species 330 



Oliona sulphurea 421 



Page. 



Polymastia(t) 497 



Grantia ciliata 330 



Leucosolenia 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 Outtyhunk 

 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 

 less fine mud. Such localities are favorable for a much greater variety 



