EEPOET ON THE RADIOLARIA. 311 



Genus 132. Druppocarpus, 1 n. gen. 



Definition. Druppulida with simple ellipsoidal cortical shell and simple 

 medullary shell, with numerous radial spines, without polar tubes. 



The genus Druppocarpus differs from Druppula only in the radial spines, which 

 arise between the pores of the cortical shell, and therefore exhibits the same relation to it 

 that Ellipsidium bears to Cenellipsis, or Prunocarpus to Prunulum. 



Subgenus 1. Druppocarpetta, Haeckel. 



Definition. Network of the cortical shell regular, with meshes of equal size 

 and similar form. 



1. Druppocarpus ananassa, n. sp.' 



Cortical shell thin walled, with regular, circular, hexagonally framed pores, of about the same 

 breadth as the. elevated bars ; fourteen to sixteen on the half equator. From each hexagon-corner 

 (between every three pores) arises a short thin radial spine, about as long as two pores, three-sided 

 pyramidal at the base. Proportion of both cortical axes = 4:3. Medullary shell spherical, half as 

 broad as the cortical shell. (Greatly resembles Druppula pandanus, PI. 39, fig. 3, but differs in 

 the larger medullary shell and the spines on the surface.) 



Dimensions. Major axis of the ellipsoidal cortical shell 016, minor 012 ; pores and bars O'OOG ; 

 length of the radial spines 0'02 ; diameter of the medullary shell 0'06. 



Habitat. South Pacific, Station 289, surface. 



2. Druppocarpus castanca, n. sp. 



Cortical shell thin walled, with regular, circular pores (without hexagonal frames), of about the 

 same breadth as the bars; twelve to fourteen on the half equator. Between every three 

 meshes arise a short conical spine with bristle-like apex, twice to four times as long as one pore. 

 Proportion of both cortical axes = 3:2. Medullary shell spherical, one-third as broad as the 

 cortical. (Resembles very closely the spherical Haliomma castanea, Haeckel, figured in my 

 lonograph, pi. xxiv. fig. 4.) 



Dimensions. Major axis 015, minor axis 01 ; pores and bars O'OOo ; length of the radial spines 

 31 to 0-02 ; medullary shell 0'035. 

 Habitat. North Atlantic, surface ; Canary Islands, Lanzerote, Haeckel. 



Subgenus 2. Druppocarpissa, Haeckel. 



Definition. Network of the cortical shell irregular, with meshes of different size or 

 form. 



1 Druppocarpus = Olive-fruit ; fyinrir 



