4GS PR MURRAY ON THE DEEP AND SHALLOW -WATER MARINE FAUNA 



LIST VIII. 



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

 Station 157 in the Southern Indian Ocean. 



The following is a list of the species of Radiolaria (numbering 81 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 Cromyosphcera antarctica, which is probably gene- 

 tically related with the very similar form, CromyornAiia 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., Spongodiscus, Spongo- 

 trockus, Stylotrochus). 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 Sphseroidea 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 borealis and Botryopylc 

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

 Cornutella clathrata, Cornutelba cannulata, and Litliomitra lineata. 



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

 icosaspis. 



The Phgeodaria are represented by a few remarkable forms, such as Sagenoscenu 

 p>enicillata, Aulosphcera bisternaria, Cannosphcera antarctica, and Conchasma hippurites; 

 all these, however, are rare. 



I. Spumellaria. 

 a. SplajroiJca. 



Cenosphcera solida, Haeckel. 



,, papillata, Haeckel. 



,, antiqua, Haeckel. 



,, antarctica, Haeckel. 



Carposphiera nobilis, Ehrenberg. 

 Thccosphwra diplococcus, Haeckel. 

 Cromyosphcera antarctica, Haeckel. 

 Styptosphaera spongiacea, Haeckel. 



Spoyigoplerjma antarcticum, Haeckel. 

 Spongodictyon antarcticum, Haeckel. 

 Amphisphcera neptunus, Haeckel. 

 Stauracontium antarcticum, Haeckel. 

 Hexacontium hexaconicum, Haeckel. 



„ antarcticum, Haeckel. 



Acanthosphan-a antarctica, Haeckel. 

 Cladococcus antarcticus, Haeckel. 



,, dendrites, Haeckel. 

 Haliomma antarcticum, Haeckel. 

 Actinomma pachycapsa, Haeckel. 





