REPORT ON THE RADIOLARTA. 763 



4. Stauracantha scalaris, n. sp. 



Spines four-winged prismatic, with four broad prominent edges, truncated apex, and small 

 basal leaf-cross ; in the proximal third with four compressed lamellar apophyses. Each apophysis 

 is pinnate with opposite pinnulte, or crossed at right angles by three to six parallel transverse 

 rods. 



Dimensions. — Length of the spines 0'24, breadth O^OIG ; central distance of the apophyses 0'12. 



Habitat. — Indian Ocean (Madagascar), Eabbe, surface. 



5. Stauracantha johannis, n. sp. 



Spines four-sided pyi-amidal, with simple apex and broad basal leaf-cross, with four large 

 conical apophyses about in tlieir middle. Each apophysis bears two irregular rows of alternating 

 perpendicular lateral branches, the length of which decreases from the base towards the apex of the 

 apophysis. 



Dimensions. — Length of the spines 0'2, middle breadth 0'02 ; central distance of the apophyses 



0-1. 



Habitat. — South-east Pacific (off Juan Fernandez), Station 300, surface. 



6. Stauracantha murrayana, Haeckel. 



Xipliacantha species, Wyville Thomson, 1877, The Atlantic, vol. i. p. 23.5, fig. 53. 

 Xiphacantha murra7jana, Haeckel, 1878, Protistenreich, p. 45, fig. 33. 



Spines quadrangular prismatic, with pyramidal apex and small basal leaf-cross, with four regular 

 conical apophyses in the proximal part. Each apophysis is crossed at right angles by two 

 parallel transverse rods ; the smaller apical rod is simple ; the larger basal rod is crossed again 

 on each side by a secondary perpendicular branch, which therefore is parallel to the apophysis 

 itself. 



Dimensions. — Length of the spines 0'3, breadth O'Ol, distance of the apophyses 0'08. 



Habitat. — South Atlantic, Station 332, surface. 



7. Stauracantha pinnulata, n. sp. 



Spines four-winged pyramidal, with prominent edges, simple apex and large basal leaf-cross, in 

 the middle with doubly pinnate triangular apophyses. Each apophysis is crossed at rioht angles 

 by three to four transverse parallel rods, which bear again perpendicular secondary branches • the 

 outline of the doubly pinnate ajiophysis is an isosceles triangle. 



Dimensions. — Length of the spines 0-3, middle breadth 0-02; distance of the apophyses 0-12. 



Habitat. — North Pacific, Station 244, surface. 



