REPORT ON THE RADIOLARIA. 917 



2. Plagonium lampoxanthium, n. sp. 



Spines irregularly curved, slender, cylindrical, six to eight times as long as the common middle 

 rod, in the proximal half smooth, in the distal half covered with short thorns. (Similar to 

 an isolated spiculum of Lampoxanthium punctatum or of Sphcerozoum variabite, PL 4 fig. 5.) 



Dimensions. Length of the spines 018, of the middle rod 0'03. 



Habitat. North Pacific, Station 240, surface. 



3. Plagonium arborescens, n. sp. 



Spines irregularly curved and branched, slender, cylindrical, thorny, twelve to sixteen times as 

 long as the middle rod ; the branches are large, arborescent, their ramules again ramified and 

 very thorny. 



Dimensions. Length of the spines 0'2 to 0'25, of the middle rod 0'02. 



Habitat. Indian Ocean, Madagascar (Eabbe), surface. 



4. Plagonium trigeminum, n. sp. 



Spines straight, slender, cylindrical, four to six times as long as the middle rod, in the basal 

 half smooth, in the distal half arborescent, with three to four irregular verticils of ramified branches. 

 (Similar to a single spiculum of Sphcerozoum verticillatum, PL 4, fig. 7.) 



Dimensions. Length of the spines 015 to 0'2, of the middle rod 0'05. 



Habitat. Central Pacific, Station 265, depth 2900 fathoms. 



5. Plagonium distriactis, n. sp. 



Spines straight and stout, three-sided prismatic, smooth, ten to twelve times as long as the 

 middle rod ; each on the distal end cleft into three divergent straight branches, which are again 

 trichotomous. 



Dimensions. Length of the spines 015 to 018, of the middle rod 0'015. 



Habitat. South Pacific, Station 288, surface. 



Subfamily 4. POLYFLAGIDA, Haeckel, 1881, Prodromus, p. 424. 

 Definition. P lagonida with numerous (seven to nine or more) radial spines. 



Genus 392. Polyplagia, 1 n. gen. 



Definition. P lagonida with numerous (seven to nine or more) radial spines, 

 arising from a common centre and lying in different planes. 



1 Polyplagia Manifold; 



