REPORT ON THE RADIOLARIA. 1075 



7. Dictyospyris gigas, Biitschli. 



Dictyospyris gigas, Butschli, 1880, Zeitschr. f. wiss. Zool., vol. xxxvi., p. 539, Taf. xxxii. 

 fig. 14a, 146. 



Shell subspherical, smooth, with a half (ventral) sagittal stricture, and a nearly complete internal 

 ring. Pores very numerous and small, circular. No larger annular pores. Basal plate with three 

 large collar pores (the sternal odd pore apparently divided into two jugular pores by the visible free 

 procolumella. (Compare Circospyris gigas, p. W7 2 = Dictyospyris gigas, Ehrenberg). 



Dimensions. Shell O'l long, 0'14 broad. 



Habitat. Fossil in Barbados. 



Subgenus 3. Dictyospyrissa, Haeckel. 



Definition. Basal plate with four large collar pores (two larger posterior cardinal 

 and two smaller anterior jugular pores). 



8. Dictyospyris fenestra, Ehrenberg. 



Dictyospyris fenestra, Ehrenberg, 1875, Abhandl. d.k. Akad. d. Wiss. Berlin, p. 68, Taf. xix. fig. 11. 



Shell nearly cubical, smooth, without external sagittal stricture. Internal sagittal ring complete. 

 Pores small, roundish ; on each side of the ring two crossed pairs of large, square, equal, annular 

 pores. Basal plate also with four longer pores of nearly equal size. 



Dimensions. Shell 0'05 long, 0'07 broad. 



Habitat. Fossil in Barbados. 



9. Dictyospyris tetrastoma, Ehrenberg. 



Dictyospyris tetrastoma, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. xix. 

 fig. 12. 



Shell nut-shaped, tuberculate, with slight sagittal stricture. Pores numerous, irregular, roundish. 

 No larger annular pores. Basal plate with four large ovate collar pores (the two cardinal twice as 

 large as the two jugular pores). 



Dimensions. Shell O'Oo long, 0'07 broad. 



Habitat. Cosmopolitan ; Atlantic, Indian, Pacific ; also fossil in Barbados and Sicily. 



10. Dictyospyris spinulosa, Ehrenberg. 



Dictyospyris spinulosa, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. xix. 



fig. 13. 

 ICeratospyris lorealis, Bailey, 1856, Amer. Journ. of Science and Arts, vol. xxii. pi. i. fig. 3. 



Shell nut-shaped, spinulate, without external stricture, with an internal free sagittal ring. Pores 

 numerous, irregular, roundish ; on each side of the ring two pairs of very large square pores. 

 Basal plate with four large collar pores. 



