REPORT ON THE RADIOLAEJA. 507 



spines short, pyramidal, about as long as the breadth of one ring. Margin between them ciliated, 

 with thin radial bristles. 



Dimensions. Diameter of the disk (with four rings) 0'13; breadth of each ring 0'015; pores 0'0025. 



Habitat. South Pacific, Station 295, depth 1500 fathoms. 



3. Staurodictya elegans, n. sp. (PL 42, fig. 1). 



All rings of the disk concentric, circular, or roundish, of increasing breadth towards the margin; 

 the fifth ring twice as broad as the first. Pores irregular, roundish, two to three on the breadth of 

 each ring. Four marginal spines very large, conical, with a thin pedicle at the base, cancellated by 

 ten to twelve deep furrows, about as long as the radius of the disk and three times as long as broad 

 at the base (above the pedicle). Margin between them ciliated, with numerous short radial spines. 



Dimensions. Diameter of the disk (with six rings) 0'14 ; breadth of the inner rings 0'006, of 

 the outer 0'012 ; pores 0'002 to O'OOS. 



Habitat. Pacific, central area, Station 272, depth 2600 fathoms. 



4. Staurodictya quadrispina, Haeckel. 



Stylodictya quadrispina, Haeckel, 1862, Monogr. d. Radio!., p. 496, Taf. xxix. fig. 4. 



All rings of the disk concentric, circular, of increasing breadth towards the margin ; the fourth 

 ring twice as broad as the second. Pores irregular, roundish, two to three on the breadth of each 

 ring. Four marginal spines short and thin, conical, about as long as the breadth of one ring. 

 Margin between them smooth. 



Dimensions. Diameter of the disk (with six rings) 0'12 ; breadth of the inner rings 0'006, 

 of the outer rings 0'012 ; pores O'OOl to 0'006. 



Habitat. Mediterranean, Atlantic (Canary Islands), surface. 



Subgenus 2. Staurospira, Haeckel. 



Definition. All rings of the disk or a part of them not concentric, spirally 

 convoluted ; spiral line simple or double, sometimes half or irregular, interrupted. 



5. Staurodictya cruciata, n. sp. (PI. 42, figs. 4, 5). 



All rings of the disk nearly of the same breadth, not concentric, half-spiral, interrupted by four 

 zigzag-shaped radial beams crossed in two diameters perpendicular one to another. The quarter 

 ring of each quadrant halving both neighbouring quarters. Pores irregular, roundish, two on the 

 breadth of each ring. Pores of the outermost (eighth) ring much smaller than the others. Four 

 marginal spines cylindrical or nearly spindle-shaped, thick, about as long as the radius of the disk. 

 Margin between them smooth. 



Dimensions. Diameter of the disk (with eight rings) 0'2; breadth of each ring O'Oll; pores 0'004. 



Dimensions. Pacific, central area, Station 265, depth 2900 fathoms. 



