500 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



RADIATES. 



Uchhi^derms. 



Page. 

 StioDgylocentrotus Drubaclii- 



ensis 49G 



Asterias vulgaris 496 



Page. 



A. arenicoia 326 



Cribrella sanguinolenta 496 



Opliionholis aculeata 496 



Amleplis. 



Page. 



Clytia Johnstoni 408 



C. intermedia 408 



Orthopyxis caliculata 408 



Platypyxig' cylindrica 408 



Campanularia voliibilis 408 



C. flexuosa 327 



Obelia geniculata , 496 



O. dichotoma ' 407 



O. flabellata 497 



O. diapbana 327 



Page. 



Sertularia argeutea 408 



S. cupressina 408 



Hydrallmania falcata 408 



riumularia, species 407 



Autenuularia antennina ..... 497 



Eudeudrium ramosum 408 



E. dispar 408 



Peunaria tiarella 327 



Tbamiiocuidia tenella 407 



Hydractinia polyclina 328 



Folyps 

 Page, 

 Alcyonium carueum 497 



Metridiuin margiuatnm 329 



Page. 



Edwardsia liueata 497 



Astraugia Daiii^e 408 



PROTOZOA. 



Sponges. 



Page. 



Cbaliua oculata 497 



Tedaiiia, two species 498 



Eenieria, species 330 



Cliona sulpburea 421 



Page. 



Polymastia(?) 497 



Grantia ciliata 330 



Leucosolenia botryoides (I).. 391 



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



OPEN coast. 



The bottom off the soutberu sbores of Nantucket and Martba'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 Cuttyhunk 

 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 



