1606 THE VOYAGE OF H.M.S. CHALLENGER. 



1. Sagena ternaria, n. sp. (PI. 108, fig. 8). 



Network subregular, with equilateral triangular meshes, intermingled with single irregular 

 meshes (fig. 8). Bars of the network smooth, its nodal points solid, not pierced. 



Dimensions. Diameter of the spherical shell 1'5 to 2'5, length of the bars 01 to - 2, breadtli 

 0-002 to 0-005. 



Habitat. Cosmopolitan ; Mediterranean, Atlantic, Indian, Pacific, surface. 



2. Sagena pertusa, n. sp. 



Network subregular, with nearly equal triangular meshes. Bars of the network smooth, its 

 nodal points pierced by a circular hole. 



Dimensions. Diameter of the shell T2 to T8, length of the bars 0'2 to 0'25, breadth O'OOS. 

 Habitat. Central Pacific, Stations 270 to 274, surface. 



3. Sagena triangula, n. sp. 



Network very regular, with equilateral triangular meshes. Bars of the network spinulate, like 

 those of Sagoplegma spinulosa (PI. 108, fig. 14), its nodal points solid, not pierced. 

 Dimensions. Diameter of the shell 2'2, length of the bars 0'25, breadth 0'004. 

 Habitat. South Atlantic, Station 325, surface. 



4. Sagena crucifera, n. sp. 



Network more or less irregular, with unequal triangular meshes. Bars of the network studded 

 with scattered, rectangular, minute crosses, arising perpendicularly, each cross composed of four 

 small equal bars. Nodal points partly solid, partly pierced by a hole. Network very similar to 

 that of Dictyosoma trigonizon, figured in my Monograph, Taf. xxvi. figs. 4, 5. 



Dimensions. Diameter of the shell T5, length of the bars 01 to - 2, breadth 0'003. 



Habitat. Mediterranean, Atlantic, Canary Islands, Station 353, surface. 



Genus 676. Sagosplicera, 1 n. gen. 



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

 which is composed of a simple lattice-plate, and bears on its nodal points radial spines. 



The genus Sagosphcera differs from the preceding Sagena, its ancestral form, in the 

 development of radial spines on the nodal points of the simple delicate lattice-sphere. 

 It exhibits therefore the same relation to the latter as Aulosphcera bears to Aularia. 



1 Sagospluera = Spherical armour ; aayn, <7<p/{ . 



