REPORT ON THE RADIOLAR1A. 1307 



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

 the thorax, with a broad, hyaline peristome. 



Dimensions. Cephalis 0'02 long, 0'03 broad ; thorax 0'09 long, 0'06 broad. 



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



7. Dictyocephalus mediterraneus, n. sp. (PL 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, - 04 broad ; thorax 01 long, 0'08 broad. 



Habitat. Mediterranean, Smyrna (Haeckel), surface. 



8. Dictyocephalus papillosus, Haeckel. 



Eucyrtidium papillosum, Ehrenberg, 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. 



Habitat. 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. 



Habitat. Central Pacific, Station 271, depth 2425 fathoms. 



10. Dictyocephalus reticulum, Haeckel. 



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



Eucyrtidium reticulum, Ehrenberg, 1861, Monatsber. d. k. preuss. Akad. d. "Wiss. Berlin, 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 



