RADIOLARIA — EUSCENIU.M, (iAZELLETTA, HALIOMMA 161 



EUSCENIUM TRICOLPIUM JIkl. 

 (Chall. pag. 1147 PI. LIU fig, 12.) 



IH'.tS March: (i2" N. 2= E. 



Juhi: 7S-' N. 3^ W. (deep sea haul from 2,600 m.). 



Xoccmbcr: b?, N. 32° and 50° W.; 56" N. 36°, 30" and 23" W 



Drrrnihir: 43° N. 57° W. 

 1899 Mufch: 64° N. 12° W. 



Xnvcinber: 51° X. 21° W 



Temperature: 9.i, mean of 5 obs., max. 13, min. 6.s. 



Salinity: 3'L.iii, mean of 5 obs., max. 35.3s, min. 34.o.i. 



Plankton-type. According to I-Lkckel this species has been 

 found in the central Pacific, abysmal ; according to the above data 

 it occurs in the Northern Atlantic in most cases associated with 

 Styli-plankton, but it seams nevortlieless not to be a true Styli- 

 plankton-form. To judge from ils non occurrence in the Atlantic, 

 S. of 1(J % it seems as if it derived from the Polar J^asin or N. Pacific, 

 as is probably the case also with many other radiolaria of the 

 i\orthern Atlantic. 



GAZELLETTA HEXANEMA 11 kl. 



(Chall. pag. KiTl PI. CXX fig. 5.) 

 ISIIS MaiTlr. 4-9° N. 18° \V. 



Temperature: 11° 



Salinity: 35. c.-,. 



Plankton-type. Found in the Atlantic, Mediterranean, Indian 

 and Pacific. .My specimens were found in Slyli- and Tricho-plankton 

 intermingled. — .S. ? 



HALIOMMA ECHINOSPHiERA Cl. 



(K. Sv. V.'l. Akad. Handl. Vol. XXXIV n. 1 PI. V fig. 6.) 



1899 Jatniartj: 45° N. 49° W. 



Temperature: 12 

 Salinity: 35.32. 

 Plankton-type: ? 



11 



