1144 THE VOYAGE OF H.M.S. CHALLENGER. 



4. Tripodiscium campanula, Haeckel. 



Carpocanium campanula, Stbhr, 1880, Palaeontogr., vol. xxvi. p. 96, Taf. iii. fig. 9. 



Shell campanulate or subspherical, smooth, about as long as broad. Pores small, regular 

 circular, as broad as the bars. Mouth constricted, about half as broad as the shell, with three short 

 conical descending feet. 



Dimensions. Shell 0'06 long, 0'05 broad ; feet 0'02 long. 



Habitat. North Pacific, Station 244, depth 2900 fathoms ; fossil in Sicily. 



Subgenus 2. Tripodisculus, Haeckel. 

 Definition. Feet branched or forked. 



5. Tripodiscium furcatum, n. sp. 



Shell ovate, rough, nearly as broad as long. Pores subregular, circular, twice as broad as the 

 bars. Mouth constricted, two-thirds as broad as the shell, with three divergent parallel and vertical 

 feet, which are as long as the shell, and forked at the distal end. 



Dimensions. Shell 0'09 long, 0'08 broad ; feet 0'07 long. 



Habitat. Tropical Atlantic, Station 338, depth 1990 fathoms. 



6. Tripodiscium ramosum, n. sp. 



Shell ovate, tuberculate, nearly as broad as long. Pores irregular, roundish, of very different 

 sizes. Mouth constricted, half as broad as the shell, with three large, divergent, irregularly branched 

 feet, nearly twice as long as the shell. (Similar to Tristylospi/ris ramosa, PI. 52, fig. 23, but without 

 sagittal ring and constriction.) 



Dimensions. Shell 0'07 long, 0'06 broad ; feet 015 long. 



Habitat. Central Pacific, Station 274, depth 2750 fathoms. 



7. Tripodiscium sphcerocephalum, n. sp. (PI. 52, tig. ' 



Shell subspherical, rough, with circular pores of different sizes. Mouth constricted, circular, 

 simple, two-thirds as broad as the shell, with three large divergent feet, which are three-sided 

 prismatic, irregularly branched, and twice as long as the shell. 



Dimensions. .Shell 0'07 long, 0'08 broad ; feet 0'12 long. 



Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



