REPORT ON THE RADIOLARIA. 1147 



simple collar-holes. The apical horn and the three feet are three-sided prismatic, smooth, about 

 twice as long as the columella, straight and widely divergent. 



Dimensions. Shell O08 long, 01 broad. 



Habitat. Tropical Pacific, Station 225, depth 4475 fathoms. 



3. Euscenium hemisphcericum, n. sp. 



Shell hemispherical smooth, half as long as broad, with small and numerous subregular circular 

 pores. Basal plate with three large triangular simple collar-holes. Horn slender, three-sided 

 prismatic, twice as long as the columella. Feet very slender, with three denticulate edges, widely 

 divergent and curved like the quadrant of a circle. 



Dimensions. Shell 0'04 long, 0'06 broad. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



4. Euscenium tricolpium, n. sp. (PL 53, fig. 12). 



Archiscenium tricolpium, Haeckel, 1881, Prodromus et Atlas, loc. cit. 



Shell cap-shaped, nearly hemispherical, with three vaulted hemispherical bosoms between the 

 three arches ascending from the feet to the horn. Network very irregular, with polygonal meshes, 

 of different form and size. Basal plate with three large primary and some smaller irregular 

 accessory collar-holes. Horn slender, straight, twice as long as the columella. Feet of the same 

 length, slender, widely divergent, slightly curved. The three edges of the horn and the feet are 

 elegantly denticulated. 



Dimensions. Shell 0*04 long, 0'08 broad. 



Habitat. Central Pacific, Station 266, depth 2750 fathoms. 



5. Euscenium tripospyris, n. sp. (PL 84, fig. 8). 



Tripospyris euscenium, Haeckel, 1881, Prodromus et Atlas. 



Shell nearly spherical, smooth, with numerous small circular pores. Basal plate also with 

 numerous small pores. Horn and feet stout, three-sided prismatic, straight or slightly curved, about 

 as long as the thin, somewhat curved columella. This species is closely allied to Tripospyris. 



Dimensions. Shell Oil to 012 diameter, horn and feet 0'08 to 01 long. 



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



Subgenus 2. Euscenidium, Haeckel. 

 Definition Feet forked or branched. 



6. Euscenium furcatum, n. sp. 



Shell campanulate, smooth, with numerous irregular roundish pores. Basal plate with nine 

 pores (three larger central and six smaller distal). Horn club-shaped, half as long as the columella. 



