468 DR MURRAY OX THE DEEP AXD SHALLOW -WATER MARINE FAUNA 



LIST VIII. 



Radiolaria observed in the Deposit and at the Suefack at the Challenger 

 Station 157 ix the Southern Indian Ocean. 



The following is a list of the species of Radiolaria (numbering SI species, belonging 

 to G3 genera) observed in the deposit from the Challenger deep-water Station 157, lat. 

 53' 55' S., 1950 fathoms, in the Southern Indian Ocean. 



The sediment which remains after removing the Diatoms and Foraminifera and larger 

 mineral particles is almost entirely composed of Radiolarians, mainly belonging to a few 

 species of Sphaeroidea which make up about nine-tenths of the whole mass. By far the 

 commonest of these Spumellaria is CromyospluBra antarctica, which is probably gene- 

 tically related with the very similar form, Cromyomma perspicuum, occurring on the 

 surface at the same Station. Of the other Spumellaria the Discoidea are the most 

 abundant, particularly the Spongy forms (Spongodiscida, e.g., Spongodiscicft, Spongo- 

 trochus, Stylotroclius). Particularly noteworthy is a new genus, Spongopyle, not 

 described in the Challenger Report ; it is a Spongodiscid with a marginal osculum like 

 that of the Porodiscid Ommatodiscus, which also occurs at this Station. In contrast 

 to the large number of S^jhteroidea and Discoidea, the Prunoidea and Larcoidea are 

 present only as isolated specimens. 



Very few species of Nassellaria are present, but among them the Botryodea, which 

 are generally rare, are rather abundant, especially Botryocella horealis and Botryopylc 

 cnbrosa. The most common Cyrtoidea are a few cosmopolitan forms, for example, 

 Cornutella clatlirata, Cornutella cannulata, and Litlioraitra lineata. 



The Acantharia are only represented in this deposit by a single rare species, Pardopdta 

 icosaspis. 



The Phseodaria are represented by a few remarkable forms, such as Sagenoscena 

 p>enicillata, Aulosphcera histernaria, Cannosphcura antarctica, and Conchasvia hippurites; 

 all these, however, are rare. 



I. Spumellaria. 

 a. Spbaeroidea. 



Cenospharra salvia, Ilaeckel. 



„ iMpillata, Haeckel. 



,, antiqua, Haeckel. 



„ antarctica, Haeckel, 



CarpospJuera nohilis, Ehrenberg. 

 Thccosphwra iliplococcus, Haeckel. 

 Cromyosphcera antarctica, Haeckel. 

 St7/pto^}hcei-a spongiacea, Haeckel. 



Spongoplegnia antarcticum, Haeckel. 

 Spmigodictyon antarcticum, Haeckel. 

 Amphispiaifra wptunus, Haeckel. 

 Stauraconlium untarcticuin, Haeckel. 

 Hexacontium hexaconicum, Haeckel, 



„ antarcticum, Haeckel. 



Acanthosplicera cmtarctica, Haeckel. 

 Cladoeoccus antareticus, Haeckel. 



„ dendrites, Haeckel. 

 Ilaliomma antarcticum, Haeckel. 

 Aeti7wmma paclit/capsa, Haeckel. 



