308 ' THE VOYAGE OF H.M.S. CHALLENGEE. 



from CarpospJuera by prolongation of one axis, or from Cenelli^ms by duplication of 

 the fenestrated shell. The outer (or cortical) shell is always more or less ellipsoidal ; 

 the inner (or medullary) shell also is sometimes ellipsoidal, sometimes spherical Both 

 shells are concentric, connected by a variable number of radial beams. 



Subgenus 1. Druppuletta, Haeckel. 

 Definition. — Pores of the cortical shell regular, hexagonal, or circular. 



1. Dnippula driipa, n. sp. 



Cortical shell thin walled, with smooth sm-face and regular network ; both its axes bear the 

 proportion of 4 : .3. Pores regular, hexagonal, three times as broad as the bars ; twelve to fifteen on 

 the half equator. Medullary shell spherical, about one-third as broad as the cortical shell. 



Dimcnsioyis. — Major axis of the ellipsoidal cortical shell O'l to 012, minor axis 0'08 to 0-09 ; 

 pores 0-06, bars 0"02 ; diameter of the medullary shell 0"03. 



HaMtat. — Western Tropical Pacific, Station 225, depth 4475 fathoms ; also fossil in Barbados. 



2. Druppula pandanus, u. sp. (PL 39, fig. 3). 



Cortical shell thin walled, somewhat rough, with regular network ; both its axes bear the 

 proportion of 3 : 2. Pores subregular, circular, hexagonally framed, one and a half times as broad as 

 the elevated bars ; ten to twelve on the half equator. Medullary shell spherical, one-fourth as 

 broad as the cortical shell. 



Dimensions. — Major axis of the cortical sheU 016 to 01*7, minor axis Oil to 012 ; pores O'Cl, 

 bars O'OOV ; diameter of the medullary shell 0'035. 



Habitat. — Pacific, central area, Station 268, depth 2900 fathoms. 



3. Druppida cocos, n. sp. 



Cortical shell thick walled, somewhat rough, with regular network ; proportion of both axes = 

 6 : 5. Pores regular, circular, hexagonally framed, quite as broad as the elevated bars ; fourteen to 

 sixteen on the half equator. Medullary shell ellipsoidal (with longitudinal main axis), nearly half 

 as large as the cortical sliell. 



Dimensions. — Major axis of the cortical shell 0-07 to O'OS, minor axis 0'6 to 0'65 ; pores 

 and bars 0-003 to 0-004 ; diameter of the medidlary shell 0-03 and 0-35. 



Habitat. — Western Tropical Pacific, Station 222, surface, Indian Ocean, Ceylon, Haeckel. 



4. Drujypula phcenix, n. sp. 



Cortical shell thick walled, smooth, with regular network ; proportion of both axes = 5:4. 

 ores regular, circular, hexagonally lobulate (in the same manner as in Stauroziphus gladiiis. 



