REPORT ON THE RADIOLARIA. 653 



11. Octopyle hexastyle, n. sp. 



Cortical shell nearly rectangular, thorny, with six strong radial spines in the lateral plane, two 

 opposite on the poles of the principal axis (prolongations of the principal beam at the sagittal 

 septum), four others on the truncate corners of the quadrangular lateral girdle, which is one and a 

 half times as long as broad. On the isthmus of the broad transverse girdle three pores. Sagittal 

 septum longer than the hexagonal medullary shell. Eight egg-shaped gates. 



Dimensions. — Length of the medullary shell 0-05, breadth 0'04 ; length of the cortical shell O'lS, 

 breadth 012. 



Habitat. — Xorthern Atlantic, surface ; Canary Islands, Station 9, depth 3150 fathoms. 



12. Octopyle sexangulata, n. sp. (PI. 9, fig. 12). 



Cortical shell thorny, hexagonal, with six strong conical radial spines on the six corners of 

 the lateral girdle, lying in the lateral plane, two opposite on the poles of the transverse axis, four 

 others in pairs on both sides of the annular sagittal constriction, which is only twice as long as 

 the elliptical medullary shell. Transverse girdle broad, with five pores on the isthmus. Eight 

 gates roundish, smaller than the medullary shell. 



DiTfiemions. — Length of the medidlary shell 0-04.5, breadth 0-035 ; length of the cortical shell 

 0-11, breadth 0-13. 



Habitat. — Pacific, central area. Station 270, surface. 



13. Octopyle octostyle, \\. sp. 



Cortical shell elliptical, thorny, with eight long cylindrical radial spines, lying in two crossed 

 diagonal planes, opposite in pairs, quite as in the nearly related Tdraiiylc octacanfha. It differs 

 from this species by the jierfect, latticed, vertical sagittal septum, which divides every gate into two 

 triangular halves. Lateral girdle elliptical, one and a third times as long as broad. Transverse 

 girdle on the isthmus with three pores. Septum longer than the elliptical medullary shell. 



Dimensions. — Length of the medullary shell O'OG, breadth 0-045 ; length of the cortical shell 

 0-16, breadth 0-12. 



Habitat. — South Pacific, Station 288, surface. 



14. Octopyle obtecta, n. sp. 



Cortical shell quadrangular, thorny, with eight strong diagonal spines, lying in two crossed 

 planes, and arising from the proximal edges of the gates in the same way as in the foregoing species. 

 It differs from this by four prominent latticed roofs, which arise from the distal edge of the gates 

 and connect the diagonal spines of one gate. Octo2}ijlc obtecta bears therefore the same relation to 

 Octo'pyle octostyle that Tetrapyle pluteus does to Tetrapyle octacantha. 



Dimensions. — Length of the medullary shell 0"055, breadth 0-04 ; length of the cortical shell 016, 

 breadth 0-12. 



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



