REPORT ON THE RADIOLARIA. 149 



Genus 57. Spongolonche, 1 Haeckel, 1881, Prodromus, p. 455. 



Definition. S tylosphserida with a solid sphere of spongy framework, and with 

 two opposite free radial spines. 



The genus Spongolonche differs from its probable ancestral form, Styptosphwra, by 

 the development of two opposite radial spines situated in one axis. 



1. Spongolonche compacta, n. sp. 



Spongy framework of the spherical shell very compact, with small meshes, three to four times 

 as broad as the bars. Surface rough, but not spiny. Two polar spines pyramidal, only as long as 

 the radius of the shell, one-third as broad at the base. 



Dimensions. Diameter of the shell 0~2 ; length of the spines 01, basal breadth O03. 



Habitat. Central Pacific, Station 274, depth 2750 fathoms. 



2. Spongolonche laxa, n. sp. 



Spongy framework loose, with large meshes, ten to twelve times as broad as the bars. Surface 

 spiny. Two polar spines three-sided prismatic, longer than the diameter of the shell (broken off 

 in the observed specimen). 



Dimensions. Diameter of the shell 0'5 ; length of the spine 0'6 and more, breadth O02. 



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



Genus 58. Spongostylus^ Haeekel, 1881, Prodromus, p. 455. 



Definition. S tylosphserida with spongy spherical cortical shell, enclosing in the 

 centre a simple latticed medullary shell, and with two opposite free radial spines. 



The genus Spongostylus may probably be derived from Spongoplegma by develop- 

 ment of two opposite radial spines in one axis. 



1. Spongostylus hastatus, n. sp. 



Spongy cortical shell with compact framework, twice as broad as the enclosed medullary shell, 

 the pores of which are regular, circular, twice as broad as the bars. Two polar spines, three times 

 as long as the radius of the shell, in the basal two-thirds cylindrical, in the distal third compressed, 

 two-edged, spear-shaped. 



Dimensions.- Diameter of the cortical shell 01, medullary shell 0'05 ; length of the spines 015. 



Habitat. South Atlantic, Station 335, depth 1425 fathoms. 



1 Spongolonclie = Spongy shell with spears ; 



2 Spongostyhis = Spongy shell with styles ; a 



