REPORT ON THE RADIOLARIA. 309 



PI. 15, fig. 7), three times as broad as the bars ; ten to twelve on the half equator. Medullary 

 shell ellipsoidal (with longitudinal main axis), one-third as broad as the cortical shell. 



Dimensions. Major axis of the cortical shell 01, minor axis 0'8 ; pores 0'009, bars O'OOS ; 

 axis of the medullary shell 0'03 and 0'025. 



Halitat. Mediterranean, Smyrna, Haeckel, surface. 



5. Druppula areca, n. sp. 



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

 proportion of 4 : 3. Pores regular, circular, four times as broad as the bars ; fifteen to eighteen on 

 the half equator. Medullary shell spherical, half as broad as the cortical shell. 



Dimensions. Major axis of the ellipsoidal cortical shell 012 to 014, minor axis 01 to Oil ; 

 pores O'OOS, bars 0'002 ; diameter of the medullary shell 0'05 to 0'06. 



Hiilitat. Indian Ocean, off' Bombay, Haeckel. 



6. Druppula ovata, Haeckel. 



Haliomma ovatirm, Ehrenberg, 1854, Mikrogeol., pi. xx. I. fig. 20. 

 Haliomma ovatum, Haeckel, 1862, Monogr. d. Rudiol., p. 432. 



Cortical shell thin walled, with smooth surface and regular network ; proportion of both 

 axes = 3:2. Pores regular, circular, three times as broad as the bars ; nine to ten on the half 

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



Dimensions. Major axis 0'08 to 01, minor axis 0'05 to 0'06 ; pores 0'003, bars O'OOl ; 

 diameter of the medullary shell 0'02. 



Habitat. Fossil in the Tertiary rocks of the Mediterranean coast, Greece (Zante), Ehrenberg ; 

 Sicily (Caltanisetta), Haeckel. 



7. Druppula caryota, n. sp. 



Cortical shell thick walled, with rough surface and regular network ; proportion of both axes 

 = 5:4. Pores regular, circular, twice as broad as the bars; sixteen to twenty on the half equator. 

 Medullary shell ellipsoidal, one-third as large as the cortical shell. 



Dimensions. Major axis 0'2 to 0'22, minor 016 to 018, pores O'OOS, bars 0'004 ; axes of the 

 medullary shell 0'07 and 0'055. 



Habitat. Pacific, central area, Stations 266 to 268, depth 2700 to 2900 fathoms. 



Subgenus 2. Druppulissa, Haeckel. 



Definition. Pores of the cortical shell irregular, of different form or size, usually 

 subcircular or roundish, sometimes lobed or compound. 



