REPOKT ON THE RADIOLARIA. 1141 



the sliell. Three feet slender cylindrical, widely divergent, curved, nearly twice as long as the 

 shell. 



I)ime7isiotis. — Sliell 0-08 long, 0'14 broad; horn 0"05 long, feet 015 long. 



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



3. Tripilidimn lychnocanium, u. sp. 



Shell hemispherical, thorny, one and a half times as broad as long. Pores regular, circular, 

 hexagonally fi-anied, as broad as the bars. Mouth slightly constricted. Apical horn stout and 

 short, three-sided pyramidal. Three feet cylindrical, straight, divergent, twice to three times as long 

 as the shell. (Similar to Lychnocanium favosum, PI. 61, fig. 6, perhaps derived fi'om it by reduction 

 of the cephalis.) 



Dimensions. — Shell 0-08 long, 012 broad ; horn 0-02 long, feet 0'2 long. 



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



4. Tripilidmm ovatum, n. .sp. 



Shell ovate, smooth, one and a half times as long as broad. Pores regidar, circular, as broad a? 

 the bars. Mouth constricted, half as broad as the shell. Horn short, conical. Three feet conical, 

 cui-ved, convergent, scarcely one-third as long as the shell. 



Dimensions. — Shell 0'15 long. Oil broad; horn 0'02 long, feet 0'04 long. 



Habitat. — South Atlantic, Station 332, depth 2200 fathoms. 



5. Tripilidium clavatum, n. sp. 



Shell nearly spherical, tuberculate, a little broader than long. Pores regidar, circular, as Ijroad 

 as the bars. Mouth constricted, half as broad as the shell. Apical feet and the three divergent 

 feet of equal size and similar form, about as long as the shell, straight, in the basal half smooth, 

 cylindrical, in the distal half club-shaped, dimpled. (Very similar to Triiwspyris conifcra and Tripo- 

 spyris eucolpos, PI. 84, figs. 7 and 4 ; but the spherical shell exhibits no trace of sagittal ring or 

 constriction, and the simple shell-cavity has a wide open mouth, and is not closed by a liasal 

 plate.) 



Dimensions. — Shell 01 diameter, horn and feet 0'08 to 0"09 long. 



Habitat. — Central Pacific, Station 268, depth 2900 fathoms. 



(3. Tripilidium costatum, n. sp. (PI. 98, figs. 8, Sa, 8h). 



Shell ovate, spinulate and costate, nearly twice as broad as long. Surface with fifteen to twenty 

 prominent longitudinal ribs, which are convergent towards each pole and elegantly denticulate. The 

 deep furrows between them are divided by delicate, parallel, transverse ribs into numerous short and 

 broad dimples (thirty to forty in each furrow); each dimple contains a small pore, like a transverse 



