REPORT ON THE RADIOLARIA. 987 



Subgenus 1. Tricyclarium, Haeckel. 



Definition. Sagittal ring circular, smaller than the other two rings, which are both 

 elliptical. 



1. Trissocychis stauroporus, n. sp. (PI. 83, fig. 5). 



Sagittal ring circular, smaller than the other two equal elliptical rings. On each of the six 

 corners (or crossing points of every two rings) are developed four small pores, forming a cross 

 around the poles of the three axes. All three rings smooth, without spines. 



Dimensions. Height of the frontal ring 0'09, breadth 013. 



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



2. Trissocychis triaxonius, n. sp. 



Sagittal ring circular, smaller than the two other equal elliptical rings. From the edges of all 

 three rings are developed small branches, which by irregular ramification and anastomoses form 

 small irregular meshes along the rings. Similar to Trissocireus octostoma, but with thicker rings ; 

 it may be developed from the latter species by connection of the branches which border the rings. 



Dimensions. Height of the frontal ring 0'12, breadth 0'15. 



Habitat. South Pacific, Station 298, depth 2225 fathoms. 



Subgenus 2. Tricyclonium, Haeckel. 

 Definition. All three rings equal, circular. 



3. Trissocyclus sphceridium, n. sp. (PL 93, fig. 12). 



All three rings equal, circular, thorny ; their rods prismatic, three-sided, with three denticulate 

 edges ; the teeth of the lateral edges become branched, and form by anastomoses of the branches 

 small irregular meshes, which partly protect the eight large open gates. 



Dimensions. Diameter of the three rings 0'16, thickness 0'012. 



Habitat. Indian Ocean, Belligemma, Ceylon (Haeckel), surface. 



Family LI. T Y M p A N I D A, Haeckel. 



Parastephida, Haeckel, 1881, Prodromus, p. 446. 



Definition. S tephoidea with two parallel horizontal rings, an upper mitral and a 

 lower basal ring; both connected by complete or incomplete vertical rings, or by parallel 

 vertical columellse. 



