REPORT ON THE RADIOLARIA. 1565 



6. Distephanus speculum, Haeckel. 



Dictyoclm speculum, Ehrenberg, 1837, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 150; 

 Mikrogeol., 1854, Taf. xviii. fig. 57, Taf. xix. fig. 41, Taf. xxi. fig. 44, Taf. xxii. fig. 47, &c. 

 Dictyocha speculum, Stohr, 1880, Palteontogr., vol. xxvi., Taf. vii. fig. 8. 

 Dictyocha anacantha, Ehrenberg, 1854, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 238. 

 Dictyocha diommata, Ehrenberg, 1854, Mikrogeol., Taf. xxxiii., NT. xvii. fig. 6. 

 Dictyoclia erebi, Ehrenberg, 1854, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 238. 

 Dictyocha haliomma, Ehrenberg, 1844, Mikrogeol., 1854, Taf. xxi. fig. 46. 

 Dictyoclia liexathyra, Ehrenberg, 1844, Mikrogeol., 1854, Taf. xxii. fig. 46. 

 Dictyoclia ubera, Ehrenberg, 1844, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 80. 

 Dictyocha stella, Ehrenberg, 1854, Mikrogeol., Taf. xxii. fig. 52. 

 Distephanus rotundas, Stohr, 1880, Paleeontogr., vol. xxvi., Taf. vii. fig. 9. 



Each pileated piece of the skeleton is a truncated, six-sided pyramid, and composed of two 

 regular hexagonal rings which lie in parallel plains, and are connected by six ascending interradial 

 beams ; these start from the corners of the upper smaller ring and bisect the sides of the lower 

 larger ring ; from the corners of the latter start six perradial centrifugal spines. 



Dimensions. Diameter of the basal ring 0'03, of the apical ring O'Ol. 



Habitat. Cosmopolitan ; Mediterranean, Atlantic, Indian, Pacific ; fossil in Barbados, Sicily, &c. 



7. Disteplianus ornamentum, Haeckel. 



Dictyocha ornamentum, Ehrenberg, 1844, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 80; 



Mikrogeol., 1854, Taf. xxii. fig. 49. 

 Dictyocha linoculus, Ehrenberg, 1844, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 79; 



Mikrogeol., 1854, Taf. xix. fig. 42. 



Each pileated piece of the skeleton is a truncated, six-sided pyramid, similar to that of 

 Distephanus speculum, but distinguished by six small (probably vertical) teeth, which start from the 

 inside of the lower (larger) ring, on the sides of the ascending beams. 



Dimensions. Diameter of the basal ring 0'03, of the apical ring 0'015. 



Habitat. Fossil in Tertiary deposits of Sicily, Caltanisetta (Ehrenberg). 



8. Distephanus aculeatus, Haeckel. 



Dicti/ocha aculeata, Ehrenberg, 1839, Abhandl. d. k. preuss. Akad. d. Wiss. Berlin p. 149 . 



Mikrogeol., 1854, Taf. xxii. fig. 48, Taf. xix. fig. 40. 



Dictyocha aculeata, Stohr, 1880, Palseontogr., voL xxvi. p. 120, Taf. vii. fi<r. 7. 

 Dictyocha bisternaria, Ehrenberg, 1844, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 201. 



Each pileated piece of the skeleton is a truncated, six-sided pyramid, similar to that of 

 Distephanus speculum, but distinguished by six small perradial, horizontal teeth, which start from the 

 sides of the upper (smaller) ring. 



Dimensions. Diameter of the basal ring 0'02, of the apical rin" O'OOS. 



Habitat. Fossil in Tertiary deposits of the Mediterranean; plastic clay of Greece and 

 Sicily; living in the Mediterranean and the Atlantic, Station 352, surface. 



