REPORT ON THE RADIOLAEIA. 511 



subregular, circular, two ou the breadth of each ring. Eadial beams partly piercing. ^Marginal 

 spines eight to sixteen (commonly twelve), bristle-shaped, very thui, once to three times as long as 

 the diameter of the disk. (On the numerous varieties of this common species compare my 

 Monograph, 1862, p. 498.) 



Dimensions. — Diameter of the disk (with ten rings) 0-22 ; breadth of the inner rings 0-004 to 

 0-008, of the outer 0-012 to 0-015 ; pores 0-003 to 0-005. 



^■a&iila^.— Cosmopolitan ; Mediterranean, Atlantic, Indian, Pacific, surface. 



6. Stylodictya solmaris, n. sjd. 



All rings of the disk concentric, polygonal, with eight to sixteen rounded corners ; their 

 breadth increases from the centre ; eighth ring twice as broad as the second. Tores subregular 

 circular, large, only one pore on the breadth of each ring. Twenty to thirty marginal spines, bristle- 

 shaped, undulating, about as long as (or longer than) the diameter of the disk. 



Dimensions. — Diameter of the disk (witli eight rings) 0-2 ; breadth of the inner rings 0-005, of 

 the outer 0-012 ; pores 0-004 to 0-008. 



Habitat. — South Atlantic, Station 332, depth 2200 fathoms. 



7. Stylodictya octogonia, u. sp. 



All rings of the disk concentric, increasing in breadth from the centre. The outer rings 

 (five to eight) regular, octogonal, twice as broad as the circular inner rings. Pores subregular, 

 circular, two to three on the breadth of each ring. Eight piercing perradial spines (alternating 

 with the eight corners of the octogonal rings) bristle-shaped, longer than the diameter of 

 the disk. 



Dimt^isions. — Diameter of the disk (with eight rmgs) 0-24 ; breadth of the inner rings O'OOG, of 

 the outer 0-014; pores 0-005 to 0-01. 



Habitat. — North Atlantic, Station 353, depth 2965 fathoms. 



Subgenus 2. Stylodictula, Haeckel. 



Definition. — Rings of the disk jjartly concentric, completely annular ; partly spiral 

 or interrupted, often irregular. 



8. Stylodictya perisiyira, n. sp. 



Inner rings of the disk (two to four) concentric, circular, or roundish, outer rings forming a 

 simple spiral, breadth a little increasing from the centre. Pores subregular, circular-, about two on 

 the breadth of each ring. Marginal spines bristle-shaped, ten to fifteen, about as long as the 

 diameter of the disk. 



Dimensions. — Diameter of the disk (with eight rings) 0-2 ; breadth of each ring 0-013 ; 

 pores 0-004. 



Halitat. — Pacific, central area, Station 272, depth 2600 fathoms. 



