REPORT ON THE RADIOLARIA. 1307 



roundish, double-contoured pores, irregularly disposed. Mouth constricted, two-thirds as broad as 

 the thorax, with a broad, hyaline peristome. 



Dimcnsioiis. — Cephalis 0'02 long, 0"03 broad ; thorax O'OO long, O'OG broad. 



Habitat. — East coast of Australia, Station 164, surface. 



7. Dictyocephalus mediterraneiis, n. sp. (PI. 62, fig. 2). 



Shell rough, thin-walled, with slight collar stricture. Length of the two joints = 3 : 10, 

 breadth = 4 : 8. Cephalis hemispherical, with small, circular pores. Thorax ovate, truncate, with 

 much larger circular pores of different sizes and thin bars between them. Mouth little constricted, 

 two-thirds as broad as the thorax, with a narrow, hyaline peristome. 



Dimensions. — Cephalis 0'03 long, 0'04 broad ; thorax 01 long, 0'08 broad. 



Hahitat. — Mediterranean, Smyrna (Haeckel), surface. 



8. Dictyocephalus papillosus, Haeckel. 



Hucyrtidium papillosum, Etrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 293, Taf. vii. 



fig. 10. 



Shell thin-walled, papillate, with obliterated collar stricture. Length of the two joints = 2:7, 

 breadth =3:5. Cephalis hemispherical, with small, circular pores. Thorax slenderly ovate, with 

 larger, subregular, circular pores, separated by oblique series of conical papillae. Mouth with a 

 broad, hyaline peristome (the " third articulus " of Ehrenberg), separated by a stricture from the little 

 broader thorax. 



Dimensions. — Cephalis 0-02 long, 0"03 broad ; thorax 0'07 long, 0"05 broad. 



Hahitat. — "Western Tropical Pacific (Philippine Sea), depth 3300 fathoms. 



9. Dictyocephalus tabulatus, n. sp. 



Shell thin-walled, papillate, with obliterated collar stricture. Length of the two joints = 2 : 10, 

 breadth = 3:7. Cephalis hemispherical, with small, circular pores. Thorax slenderly ovate, 

 truncate, with large, subregular, circular, hexagonally-framed pores. Mouth little constricted 

 nearly as broad as the thorax, with a broad, hyaline peristome. 



Dimensions. — Cephalis 0'02 long, 0'03 broad ; thorax 01 long, 0'07 broad. 



Hahitat. — Central Pacific, Station 271, depth 2425 fathoms. 



1 0. Dictyocephalus reticulum, Haeckel. 



Dictyoeephalxis reticulum, Haeckel, 1862, Monogr. d. Radiol., p. 297. 



Eucyrtidium reticAilum, Ehrenberg, 1861, Monatsber. d. k. preuss. Akad. d. "Wiss. BerHii, p. 300. 



Shell thin-walled, smooth, with deep collar stricture. Length of the two joints = 2 : 8, 

 breadth = 3 : 5. Cephalis subspherical, with small, circular pores. Thorax campanulate, with 



