REPORT ON THE RADIOhARIA. 333 



4. Xiphatractus sulcatus, Haeckel. 



Stylosphiera sulcata, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 84, Taf. xxiv. 

 fig. 6. 



Cortical shell thick walled, with thorny surface, and regular, circular pores, quite as broad as 

 the bars; nine to ten on the half equator. Polar spines cylindrical, with longitudinal basal furrows 

 and conical apex, three times as broad as the pores; the larger about as long as the main axis, the 

 shorter only one-half or two-thirds as long. 



Dimensions. Major axis O'Ol, minor 0'08; pores and bars 0'007; main axes of the two medullary 

 shells 0'08 and 0'04; length of the major polar spine 01, of the minor O06, breadth of them 0'02. 



Habitat. Fossil in the Barbados deposits. 



5. Xiphatractus dasypus, n. sp. 



Cortical shell thick walled, with spiny surface, and regular, elegant network; pores circular, 

 hexagoiially framed, about as broad as the bars; from every corner of the network (between three 

 pores) arises a short bristle-like spine. Polar spines three-sided prismatic, as broad as one 

 hexagon; the major once to twice as long as the main axis, the minor only one-half to one-fourth 

 as long. (The cortical shell much resembles Ellipsoxiphus eleyans, PI. 14, fig. 7.) 



Dimensions. Major axis 015, minor 013; pores and bars O'Ol; main axes of the two medullary 

 shells 01 and 0'06; length of the major polar spine 01 to 0'3, of the minor O'Oo to O'l, thickness 

 0-01. 



Habitat. Tropical Western Pacific, Station 222, surface. 



Subgenus 3. Xiphatractona, Haeckel. 



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

 form ; surface smooth, without thorns or papillae. 



6. Xiphatractus chlamydophorus, n. sp. 



Cortical shell thin walled, smooth, with irregular, roundish pores, twice to four times as broad as 

 the bars ; eight to twelve on the half equator. Polar spines angular, irregularly curved or contorted ; 

 the larger once to twice as long as the main axis, the shorter and thicker pommel-shaped, only 

 nne-third to one-half as long; their basal breadth equals two pores. 



Dimensions. Major axis 0'14, minor 01 ; pores 0'006 to 0'012, bars 0'003 ; main axis of the 

 two ellipsoidal medullary shells O'OO and 0'04 ; length of the major polar spine 01 to 0'2, of the 

 minor 0'05 to 0'08, breadth 0'02. 



Habitat. Cosmopolitan ; Atlantic, Pacific, many Stations, surface. 



