REPORT ON THE RADIOLARIA. 385 



uii each pole, lying iu the main axis (subgenus Panicidhim); or a bunch or a circle of 

 polar spines diverging radially (sul)genus Panartidium); in the latter case the polar 

 spines can either form a bunch on the pole itself, or a crown of thorns around it. 



Subgenus 1. Panicidium, Haeckel. 

 Definition. — On lioth poles of the main axis only a single large spine. 



1. Panicinm amphacanthum, n. sp. 



All four chambers of the cortical shell nearly of the same size and form, kidney-shaped, with 

 subregular, circular pores, twice as broad as the bars ; five to six pores on the half meridian, ten to 

 eleven on the half equator of each chaml>er. Surface covered with small spines. On both poles of 

 the main axis is a very strong, conical, apical spine, half as long as the main axis, on the base one- 

 fourth as broad as the equatorial axis. 



Dimensions. — Main axis (without polar spines) 0'22, equatorial axis 0'06; pores O'Ol, liars O'OOS; 

 length of the polar spines 0'12, basal thickness O^Olo. 



Habitat — Antarctic, Station 152, depth 1260 fathoms. 



2. Panicium amjihistylvs, n. sp. 



Botli proximal chaniliers kidney-shaped, Ijoth distal chambers nearly hemispherical, somewhat 

 smaller. Pores irregular, roundish, twice to three times as broad as the bars; four to six on the half 

 meridian, eight to ten on the half equator of each chamber; a circle of larger square pores on the 

 base of each distal chamljcr. Surface thorny. On both poles of the main axis one strong, 

 pyramidal, apical spine, one-third as long as the main axis, on the base one-fourth as broad as the 

 equatorial constriction. (Similar to Panarium tuhuluriwm, I'l. 40, tig. 9, ).)ut without tubes.) 



Dimensions. — Main axis (without polar spines) 0"2, equatorial axis 0'05; pores 0"005 to O'Ol, 

 Imrs 0'003; length of the polar spines 0'07, basal thickness O012. 



Habitat. — Antarctic, Station 156, depth 1975 fathoms. 



Subgenus 2. Panartidium, HaeckeL 



Definition. — On both poles of the main axis a bunch or a circle of aggregated 

 spines. 



3. Panicinm scoimrium, n. sp. 



Both proximal chambers kidney-shaped, both distal chambers nearly hemispherical, somewhat 

 smaller Pores UTegular, polygonal, twice to five times as broad as the bars ; six to eight on the half 

 meridian, twelve to fourteen on the half equator of each chaml:)er. Surface spiny, covered with thin, 



(ZdOL. CHALU EXP. — PART XL. — 188.5.) Rr 49 



