REPORT ON THE RADIOLARTA. 327 



8. Druppatractus Icevis, Haeckel. 



Stylosphcera Icevis, Ehreuberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 84, Taf. xxv. fig. 6. 



Cortical shell thin walled, smooth, with irregular network. Proportion of the two axes = 3: 2. 

 Pores roundish or subcircular, of different size, one-half to twice as broad as the bars ; eight to 

 ten on the half equator. Medullary shell ellipsoidal, one-third as large as the cortical shell. Polar 

 spines conical, the larger and thinner nearly as long as the main axis, the shorter and thicker 

 scarcely one-third as long. 



Dimensions. Major axis 0'07 to 01, minor 0'05 to 0'07 ; pores and bars 0'005 to O'Ol ; axes 

 of the medullary shell 0'03 and 0'02 ; length of the major polar spine 0'06 to 0'09, of the shorter 

 0-03 to 0-04. 



Habitat. Cosmopolitan ; Atlantic, Indian, Pacific, surface. 



9. Druppatractus xiphias, n. sp. 



Cortical shell thick walled, smooth, with irregular network. Proportion of the two axes = 6:5. 

 Pores funnel-shaped, composed of two to four confluent smaller porules, twice to four times as broad 

 as the bars ; ten to twelve on the half equator. Medullary shell spherical, half as broad. Polar 

 spines three-sided pyramidal, the larger about as long as the main axis, the shorter one-third to 

 one-half as long. 



Dimensions. Major axis 012, minor O'l; pores 0'012 to 0'018, barsO'004; diameter of the 

 medullary shell O'Oo ; length of the major polar spine O'l, of the minor 0'03 to 0'05. 



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



Subgenus 4. Driippatractium, Haeckel. 



Definition. Network of the cortical shell irregular, with meshes of unequal size or 

 dissimilar form ; surface thorny or papillose, covered with small spines or tubercles. 



10. Druppatractus diodon, n. sp. 



Cortical shell thin walled, thorny, with irregular network. Proportion of the two axes = 5:4. 

 Pores simple, irregular, roundish, twice to four times as broad as the bars ; eight to ten on the half 

 equator. Medullary shell spherical, half as broad. Polar spines conical, more or less curved ; the 

 major longer than the main axis, the minor scarcely half as long. (Resembles Sphcerostylus ophidium, 

 PL 16, figs. 14, 15, but differs from it in the prolongation of the main axis:) 



Dimensions. Major axis 015, minor 0'12 ; pores O'Ol to 0'02, bars 0'005 ; diameter of the 

 medullary shell 0'06 ; length of the larger polar spine 0'12 to 018, of the shorter 0'06 to 0'08, 

 basal thickness 0'003. 



Habitat. Pacific, central area, Station 274, surface. 



