212 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [50C] 



R ADI AT A. 



JEchinoderms. 



Page. 



fStereoderma uniseinita 503 



f*Echinarachnius parina 503 



Strongylocentrotus Drobach- 

 iensis 406 



Page. 



Asterias vulgaris 496 



*Cribrella sanguiuolenta. . . 407 

 Ophiopholis acnleata 496 



Acaleplis. 



Page. 



*Platypyxis cylindrica 408 



*Clytia Johnston! 408 



Eudendrium rainosum 408 



Page. 



* Phi malaria, sp 407 



Hydractinia polyclina. .... 328 



Page. 

 Edwardsia lineata. . 497 



Polyps. 



Page. 

 Alcyoniuin carneiun 497 



PROTOZOA. 

 Sponges. 



Page. 



Page. 



Chalina oculata 497 tMassi ve siliceous sponge . . 503 



Polymastia (?) 497 | 



IV. #. FAUNA OF THE MUDDY BOTTOMS OFF THE OPEN COAST. 



Within the depths to which our dredgiugs extended, very few true 

 muddy bottoms occur. The deposits of mud on the open coast usually 

 begin to occur only at the depths of twenty -five to thirty fathoms, and 

 even at these depths there is a considerable admixture with fine siliceous 

 sand. The central and deeper portion of the depression in line with the 

 axis of Vineyard Sound is, however, occupied oft to the west of Gay 

 Head and No Man's Land by a deposit of fine, soft, sticky mud, filled 

 with the tubes of Annelids and Ainphipods, (Ampelisca, &c.) Dredgiugs 

 were made on this bottom at localities 85, c, in 18 fathoms ; d, 19 fathoms ; 

 e, 11 fathoms. On September 9, the temperature at 85, c, was 58 Fah- 

 renheit at the bottom, and 62 at the surface ; at d, it was 57 at the 

 bottom an.d 62 at the surface 5 at e, it was 59 at the bottom and 63 at 

 the surface. This muddy bottom abounded in Annelids, small Crustacea, 

 and bivalve shells. 



In several other localities, where the bottom was a mixture of mud 

 and fine sand, the mud seemed to predominate and to determine the 

 character of the life, so that such localities have been classed with the 

 muddy bottoms, though the fauna differed considerably from that of the 

 soft muddy bottom* referred to above. In the following list, however, I 

 have specially designated the species found in the typical localities of 

 each kind. 



