I 
STATION 157 . 
(>*o a if mint non 
ScRFACB-Nrra. 
516 
THE VOYAGE OF H.M.S. CHALLENGER, 
Cvcmoditcus denarius, A. Schmidt. 
„ marginal ut, Ehrenberg. 
„ minor , Ehreuberg. 
„ kutzitiyii, A. Schmidt, vur. g/arialit, 
Gninow. 
„ dentindatus, Castracane. 
„ normanni, Gregory. 
„ sttllari * , Roper. 
„ africanus, Janisch. 
„ „ var. trail ichiana, Grunow. 
„ cmtralit, Ehrenberg. 
„ convent*, A. Schmidt. 
Coscinodiscus ocvlus-iridis, Ehrenberg. 
„ asteromphalus, Ehrenberg. 
„ concinnus, Smith. 
„ clegantulus, Greville. 
„ rotula, Grunow. 
„ apollinis, Ehrenberg, var. compada, 
Rattray. 
„ impolitic, Rattray [ = C. antardicus, 
Castracane], 
Melosira ep. (?). 
Brunia mirabilis, Tempore. 
Surface Organisms. — The following species of Radiolaria and Diatomacese are 
recorded from the surface at this Station : — 
Ivadioi.ai; i a (Haeckel, Zool. pt. 40). — In striking contrast to the wealth of forms 
n tin <!, posit .it this Station is the uniformity of the Radiolarian surface fauna. This 
. < i ; i .t lr.'.-i ;.i t s from the fact that the tov -nets were only dragged through a relatively 
short distance of the surface waters, whereas the deposit at the bottom represents the 
accumulation of forms which have fallen from the surface during an immense period of 
time. The ab.-cnce of some species of Acantharia and Phseodaria in the deposit, when 
• nm pared with t heir relative abundance in the surface-net gatherings, is to be accounted 
foi by ’h- structure and composition of the skeletons, which are more readily dissolved 
after the death of the animal than other Radiolaria. Certain species of Acantharia and 
Pt a-odari 1 are the most abundant here, and represented by numerous individuals. Of the 
\ a a i hai ia the most abundant are Acanthonia claparedei, Acanthostaurus purpurascens, 
and Amph'lonche lanceolata, and of the Phaeodaria, the species of Chattengeron. 
I. SrcraiXABiA. 
a. SpkxToidra. 
Styptotphmra spongiacea, Haeckel. 
A canthoephrra antarctira, Haeckel 
Crmnyomma perspicuum, Haeckel 
W‘ito*j>lt*rra trigonarantha, Haeckel 
„ antarctira, Haeckel. 
b. Diacoidea. 
Pr/roducu * fltudrella, Haeckel. 
Siylodictya multinpina, Haeckel 
KnrhiUmia mudleri, Haeckel 
titylotrochu* challenger!, Haeckel 
II. Acantharia. 
Acanthonia clapantUi, Haeckel 
Acanthwlouru* jiurfntrasri ru, Haeckel. 
Amphilonche lanceolata, Haeckel. 
Porocapsa coronodun, Haeckel. 
III. Nasseelaria. 
Didyospyri * tetrastoma, Ehrenberg. 
Cyrtocalpi* ovulum, Haeckel. 
Comutella clathrala, Ehrenberg. 
IV. PU/EODARIA. 
Didyocha etapedia, , Haeckel. 
Distephanus speculum, Haeckel. 
Aulodendron antardicum, Haeckel. 
Aulosrena penicillus, Haeckel. 
Challengcron pearccyi, Haeckel. 
„ stcirei , Murray. 
,, balfouri, Murray. 
,, richardsii, Haeckel. 
