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. 



Bimcnsimis. — Shell 008 long, O^l broad. 



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



3. Euscenium hemisphoericum, 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 slendei", with three denticulate edges, widely 

 divergent and curved lite the quadrant of a circle. 



I>imensio7is. — Shell 0'04 long, 0'06 broad. 



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



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



Archiscenium tricolpiwn, Haeckel, 1881, Prodromus et Atlas, loc. dt. 



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. Eusceniuvi triposjjyris, n. sp. (PI. 84, fig. 8). 



Tripospyris euscenium, Haeckel, 1881, Prodromus et Atlas. 



SheU 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 aUied to Tripospyris. 



Dimensions. — Shell Oil to 0-12 diameter, horn and feet O'OS 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. 



SheU 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. 



