REPORT ON THE EADIOLARIA. 141 



Dimensions. — Diameter of the outer sphere Oil, pores O'Ol to 0-017, bars 0-003 to 0-007 ; 

 diameter of the iuuer sphere 0-06, pores 0-05 to 0-008, bars 0-002 to 0-004; length of the major 

 polar spine 0-25, of the minor 0-1, basal breadth 0-03. 



Habitat. — Indian Ocean, Madagascar, Eabbe, surface. 



Geuus 50. Saturnulus,^ Haeckel, 1881, Proclromus, p. 451. 



Definition. — S ty lospli asrida witli two concentric lattice-spheres and two equal 

 opposite spines, the distal ends of which are connected by a circular or elUptical ring. 



The genus Saturmdus difiers from the similar Saturnalis by the duplication of the 

 spherical lattice-shell ; the inner lies within, the outer without the central capsule. 



1. Saturnulus circulus, n. sp. 



Cortical sheU smooth, twice as broad as the medullary slieU., witli regular, circular, hexagonally 

 framed pores, of the same breadth as the bars; fourteen to sixteen on the half equator. Eing 

 circular, smooth, without edges, its diameter three times as great as that of the sphere. 



Dimensions. — Diameter of the outer sphere D'OS, pores and bars 0-004 ; of the inner sphere 0-04, 

 of the ring 0-24. 



Hahitat. — Central Pacific, Station 272, surface. ■ 



2. Saturnidns anmdus, n. sp. 



Cortical shell smooth, three times as broad as the medullary shell, with regular, circular, 

 hexagonally framed pores, of the same breadth as the bars ; eighteen to twenty on the half equator. 

 Eing elliptical, smooth, without edges, somewhat constricted at the poles of the minor axis, its 

 major diameter four times as gxeat as that of the sphere. Differs from Saturnalis annularis, PL 13, 

 fig. 16, mainly in the possession of a medullary shell. 



Dimensions. — Diameter of the outer sphere O'l, pores and bars 0-005 ; inner sphere 0-033 ; 

 major axis of the ring 0-4, minor 0-3. 



Habitat. — -North Pacific, Station 244, surface. 



3. Saturmdus ellipticus, n. sp. (PI. 16, fig. 16). 



Cortical shell smooth, three times as broad as the medullary shell, with regular, circular pores, 

 three times as broad as the bars ; sixteen to eighteen on the half equator. Eing eUiptical, smooth, 

 without edges, its major diameter three times as great as that of the sphere. 



Dimensions. — Diameter of the outer sphere 0-09, pores 0-006, bars 0-002 ; iuuer sphere 0-03 ; 

 major axis of the eUiptical ring 0-28, minor 0-24 ; thickness of the ring and the axial beams 0-008. 



Habitat. — South Pacific, Station 300, surface. 



1 SWitniuZiis = Small /S'aterw!(.s, with a riiiff. 



