REPORT ON THE RADIOLARIA. 159 



Dimensions. — Diameter of the outer shell 012, inner 0-04; cortical pores 0-012, bars 0-003; 

 length of the spines O'OS. 



Habitat. — North Atlantic, Station 64, depth 2700 fathoms. 



2. Staurolonche spinozce, n. sp. 



Cortical shell thick walled, smooth, twice as broad as the medullary shell, with regular, circular, 

 hexagonally framed pores, three times as broad as the bars ; five to six on the c^uadrant. Four spines 

 three-sided pyramidal, half as long as the radius, as broad at the base as one mesh. 



Dimensions. — Diameter of the outer shell 0-16, inner 0-08 ; cortical pores 0-012, bars 0-004 ; 

 length of the spines 0-04. 



Habitat. — Central Pacific, Station 271, surface. 



3. Staurolonche aperta, Haeckel. 



Haliomma apertam, Elirenberg, 1875, AbhanJl. d. k. Akad. d. Wiss. Eerlin, p. 74, Taf. xxviii. 

 fig. 5. 



Cortical shell thin walled, smooth, three times as broad as the medullary shell ; pores 

 regular, circular, five times as broad as the bars ; four to five on the quadrant. Four spines conical, 

 as long as the radius, as broad as one mesh. 



Dimensions. — Diameter of the outer shell 0-1, inner 0-03 ; cortical pores 0-015, bars 0-003 ; length 

 of the spines 0-05. 



Habitat. — Fossil in Barbados. 



4. Staurolonche hrunonis, n. sp. 



Cortical shell thick walled, smooth, twice as broad as the medullary shell, with regular, circular 

 pores, three times as broad as the bars ; eight to ten on the quadrant. Four spines cylindro-conical, 

 longer than the diameter, twice as broad as one mesh. 



Dimensions. — Diameter of the outer shell 0-08, inner 0-04; cortical pores 0-006, bars 0-002; 

 length of the spines 0-12. 



Habitat. — Central Pacific, Station 268, depth 2900 fathoms. 



5. Staurolonche per tusa, n. sp. (PI. 15, figs. 5, 5rt). 



Cortical slieU thin walled, smooth, three times as broad as the medidlary shell, with regular, 

 cu'cular pores, three times as broad as the bars ; eight to ten on the quadrant. Pores of the meduUary 

 shell only one-third as large, also circular. Four spines three-sided prismatic, three times as long 

 as the radius ; each of their three thin wings perforated by a single row of small pores. 



Dimensions. — Diameter of the outer shell 0-1, inner 0-033 ; cortical pores 001, bars 0-003 ; 

 length of the spines 0-15. 



Habitat. — North Atlantic, Station 353, surface. 



