REPORT ON THE RADIOIARIA. 131 



14. Xiphostylus emberiza, n. sp. (PI. 13, fig. 11). 



Pores irregular, roundish, one to four times as broad as the bars ; six to eight on the half 

 equator. Polar spines very unequal ; major cylindrical, twice as long as the axis of the sphere ; 

 minor scarcely half as long, obliquely inserted, like a bird's head, surrounded by a group of ten to 

 twenty smaller conical spines. Opposite hemisphere smooth. 



Dimensions. Diameter of the sphere 0'005, pores 0'002 to O008, bars 0'002 ; length of the 

 major spine 0'09, of the minor 0'05, basal breadth O'Ol. 



Habitat. South Atlantic, Station 332, surface. 



15. Xiphostylus ardea, n. sp. 



Pores irregular, roundish, one to three times as broad as the bars ; twelve to sixteen on the half 

 equator. Whole surface spiny. Major polar spine three-sided pyramidal, somewhat longer than 

 the diameter of the sphere ; minor scarcely so long as its half radius, pommel-like, edged. 



Dimensions. Diameter of the sphere 012, pores 0'003 to O'Ol, bars O'OOS ; length of the 

 major polar spine 015, of the minor 0'03, basal breadth 0'02. 



Habitat. North Atlantic, Station 64, surface. 



Genus 47. Saturnalis, 1 Haeckel, 1881, Prodromus, p. 450. 



Definition. S tylosphaerida with one single lattice-sphere and two equal 

 opposite spines, connected at the distal end by a circular or elliptical ring. 



The genus Saturnalis (with simple lattice -sphere) and the two similar genera 

 Saturnulus (with two concentric spheres) and Saturninus (with three spheres) form 

 together the small peculiar group of Saturnalida, distinguished by a remarkable circular 

 or elliptical ring, connecting the distal ends of the two equal opposite polar spines. This 

 ring indicates a certain equatorial plane, and therefore brings these Sphaeroidea 

 into relation with the Discoidea. 



Subgenus 1. Saturnalina, HaeckeL 

 Definition. Ring smooth, without spines or thorns. 



1. Saturnalis circular is, n. sp. 



Pores of the spherical shell regular, circular, hexagonally framed, twice as broad as the bars. Ten 

 to twelve pores on the half equator. Ring circular, smooth, its diameter three tunes as great as that 

 of the sphere. 



1 Saturnalis = Siim\ar to Saturnus, with a ring 



