REPORT ON THE RADIOLARIA. 269 



3. Arachnosphcera dolichacantha , n. sp. 



Innermost shell with regular, hexagonal meshes, very small ; its diameter only as long as the 

 equal distances between every two concentric shells. At each nodal-point occurs one radial spine 

 with twelve to sixteen verticils (altogether thirty to forty spines). 



Dimensions. — Diameter of the innermost shell 0'05 ; distance between the concentric shells 004 

 to 0-05. 



Habitat. — ^Central Pacific, Station 265 to 274, surface. 



4. Arachnosphcera increscens, n. sp. 



Innermost shell with regular, hexagonal meshes ; its diameter three times as long as the 

 distance between it and the second shell, quite as long as the distance between the fifth and sixth 

 shells ; the distances between the concentric shells gradually increasing from the centre. Radial 

 spines about fifty to sixty, each with six to eight verticUs. 



Dimensions. — Diameter of the innermost shell (A) 0"75 ; distances between the following shells 

 — A, B = 0-025, B, C = 0-037, C, D = 0-05, D, E = 0G62, E, F = 0075, &c. 



Hahitat. — Central Pacific^ Station 271, surface. 



Subgenus 2. Arachnosphwromma, Haeckel. 

 Definition. — Pores of the innermost shell irregular, polygonal. 



5. ArachnosphcBra tenuissima, n. sp. 



Innermost shell with irregular, polygonal meshes ; its diameter twice as long as the equal dis- 

 tance between every two concentric shells. Forty to fifty radial spines, each with twelve to sixteen 

 verticils. 



Dimensions. — Diameter of the innermost shell 01, distance between the concentric shells 0-04 

 to 0-05. 



Habitat. — South Atlantic, Station 332, surface 



6. ArachnosphcBra velaris, u. sp. 



Innermost shell with irregular, polygonal meshes ; its diameter twice as long as the distance 

 between it and the second shell, quite as long as the distance between the third and fourth shells ; 

 the distance between the concentric shells gradually increasing from the centre. Piadial spines twenty 

 to thirty, each with ten to twelve verticils. 



Dimensions. — Diameter of the innermost shell (A) O'S ; distances of the following sliells — A, B 

 = 0025, B, C = 0-037, C, D = 0-05, D, E = 0062, E, F = 0075. 



Hahitat. — Tropical Atlantic, Station 347, surface. 



