REPORT ON THE RADIOLARIA. 



1605 



as in the closely allicil Aulospliajrida (PI. Ill, fig- 3). The pseudopodia arising from 

 the eenti'al capsule form a loose network in the calymma, and proceed over its surface 

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



I. Subfamily 



Sagonida. 

 Wall of the spherical 

 shell composed of 

 a simple lattice- 

 plate, with or 

 without pyra- 

 midal elevations. 



II. Subfamily 



Sagmarida. 



"Wallof thespherical 

 shell spongy, com- 

 posed of an irre- 

 gular complicated 

 wicker-work 



Syno2)sis of the Genera of Sagosphcerida. 



Surface of the spherical shell i No radial spines, surface smooth, 

 smooth or spiny, without -I 



pyramidal elevations. ( Radial spines in the nodal points, 



» 



f Pyramids without internal axial 

 Surface of the spherical shell j rod, .... 

 covered with pyramidal \ 



or tent-shaped elevations. ] Pyramids with an internal radial 



[ axial rod, 



Surface of the spherical shell 

 smooth or spiny, without 

 pyramidal elevations 



Surface of the spherical shell 

 covered with pyramidal 

 elevations. 



Surface smooth, without radial 

 spines, 



Surface studded with radial spines, 



j Pyramids on the top with a radial 

 -; spine or a bunch of divergent 

 ( spines, 



675. Sagena. 



676. Sagospha^ra. 



677. Sagoscena. 



678. Sagenoscena. 



679. Sagmarium. 



680. Sagmidium. 



681. Sagoplegma. 



Subfamily 1. Sagenida, Haeckel. 



Definition. — Sago sp h a3r id a with a delicate spherical shell, the thin wall of 

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



Genus 675. Sagena,^ n. gen. 



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

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



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

 common ancestral form of this familj^ 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 ^itZajw, 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 Cenosjyhcei-a, 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^odaria. 



1 iSa5feno= Drag-net; aay/,r/i. 



