REPORT ON THE RADIOLARIA. 301 



Subgenus 2. Ellipsostylissa, Haeckel. 

 Definition. Network of the shell irregular, with pores of different size or form. 



7. Ellipsostylus megadictya, Haeckel. 



Stylosphasra megadictya, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 299, 

 Taf. viii. fig. 13. 



Proportion of the major axis to the minor = 5:4. Shell thin walled, with irregular, roundish, 

 large meshes, four to five times as broad as the bars ; only four to five on the half equator. Surface 

 smooth. Polar spines straight, thin, angular ; the shorter equal to the minor axis, the longer four 

 times as large. 



Dimensions. Longer axis 0'05, shorter axis 0'04 ; meshes O'Ol, bars 0'002 ; length of the polar 

 spines longer 0'12, shorter 0'03. 



Habitat. Philippine Sea, 3300 fathoms, Ehrenberg. 



8. Ellipsostylus gallinula, n. sp. 



Proportion of the major axis to the minor = 3:2. Shell thick walled, with irregular, roundish 

 meshes, twice to four times as broad as the bars ; eight to ten on the half equator. Surface thorny. 

 Polar spines conical, straight ; the longer twice as long as the major axis, the minor scarcely half 

 as long. 



Dimensions. Longer axis 0'15, shorter 0'12 ; pores O'Ol to 0'02, bars 0'002 to 0'004. 



Habitat. North Pacific, Station 253, surface. 



9. Ellipsostylus hirundo, n. sp. (PI. 13, fig. 2). 



Proportion of the major axis to the minor = 4: 3. Shell thick walled, with irregular, roundish 

 meshes, three to five times as broad as the bars ; eight to ten on the half equator. The inner 

 aperture of every mesh is fenestrated by a delicate lamella of silex, perforated by six to eight 

 very small circular pores. Polar spines sharp edged, more or less curved, the shorter equal to the 

 minor axis, the longer twice as long. 



Dimensions. Longer axis 0'16, shorter 012 ; pores O'Ol to 0'02, bars 0'003 to O'OOG ; length of 

 the polar spines longer 0'24, shorter 0'12. 



Habitat. Pacific, central area, Station 268, depth 2900 fathoms ; the same form also fossil in the 

 rocks of Barbados. 



Genus 128. Lithotnespilus, 1 Haeckel, 1881, Prodromus, p. 450. 



Definition. E llipsida with simple ellipsoidal or oviform shell, the main axis of 

 which bears at one pole a single spine, at the other a bunch of several spines. 



1 LitJiomespilus = Siliceous medlar ; A/0o?, , 



