REPORT ON THE RADIOLARIA. 



1605 



as in the closely allied Aulosphserida (PL 111, fig. 3). The pseudopodia arising from 

 the central capsule form a loose network in the calymma, and proceed over its surface 

 as numerous delicate radial filaments, often supported by the radial spines. 



Synopsis of the Genera of Sagosphcerida. 



I. Subfamily 



Sagenida. 



"Wall of the spherical 

 shell composed of 

 a simple lattice- 

 plate, with or 

 without pyra- 

 midal elevations. 



II. Subfamily 



Sagmarida. 



Wall of the spherical 

 shell spongy, com- 

 posed of an irre- 

 gular complicated 

 wicker-work. 



Surface of the spherical shell 

 smooth or spiny, without 

 pyramidal elevations. 



No radial spines, surface smooth, 

 Eadial spines in the nodal points, 



I" Pyramids without internal axial 



Surface of the spherical shell rod, .... 

 covered with pyramidal < 

 or tent shaped elevations. j Pyramids with an internal radial 



[ axial rod, 



c c ,i , i i. 11 { Surface smooth, without radial 

 Surface of the spherical shell 



smooth or spiny, without -i. ie ' 



pyramidal elevations. [ g urface gtudded with radial gpineS) 



Surface of the spherical shell j Pyramids on the top with a radial 

 covered with pyramidal 1 spine or a bunch of divergent 

 elevations. ( spines, 



675. Sagena. 



676. Sagosphctra. 



677. Sagoscena. 



678. Sagenoscena. 



679. Sagmarium. 



680. Sagmidium. 



681. Sagoplegma. 



Subfamily 1. SAGENIDA, Haeckel. 



Definition. S agosphserida with a delicate spherical shell, the thin wall of 

 which is composed of a simple lattice-plate, not spongy. 



Genus 675. Sagena, 1 n. gen. 



Definition. S agosphserida with a delicate spherical shell, the thin wall of 

 which is composed of a simple smooth lattice-plate, without radial spines. 



The genus Sagena is the simplest of the Sagosphaerida and may be regarded as the 

 common ancestral form of this family. The delicate wall of the simple spherical lattice- 

 shell is composed of large, regular, or subregular, triangular meshes, the nodal points of 

 which bear no radial spines. It agrees therefore perfectly with Aularia, and differs from 

 this simplest form of Aulosphserida only in the structure of the skeleton, which is 

 composed not of hollow articulated tubes, but of very thin solid threads. The skeleton 

 may therefore also be confounded with Cenosphcera, but the central capsule of this 

 latter is " peripylean," with numerous fine pores in the entire wall, whilst that of Sagena 

 is " tripylean," having the proboscis of all PH^EODARIA. 



1 Sagena= Drag-net; atnyr,vi\. 



