REPORT ON THE RADIOLARIA. 397 



The genus Desmocampe differs from Ommatocampe in the duplication of the jointed 

 cortical shell; the radial spines, which start from the surface of the inner cortical shell, 

 are connected one with another by transverse communicating branches which form an 

 outer envelop around it; but this reticulated mantle is commonly not quite perfect and 

 more or less irregular. 



1. Desmocampe catenula, n. sp. 



Inner cortical shell with six to eight chambers of the same size and form. Every chamber kidney- 

 shaped, with three to four transverse rows of circular, subregular pores, twice as broad as the bars. 

 Outer cortical shell cylindrical, hemispherical at both poles, with smooth surface and irregular, 

 roundish pores of very different size. Distance between the two cortical shells equals the diameter 

 of the outer medullary shell, which, like the inner, is spherical. (Resembles Ommatocampe polyarthra, 

 Khrenberg, 1872, loc. cit., Taf. vi. fig. 9, but differs in the external mantle.) 



Dimensions. Lengtli of the six-chambered inner cortical shell 016, of the outer 0'21; 

 greatest breadth of each chamber of the former 0'05, of the latter Oi)9; pores of the inner 0'006, 

 bars 0-003; pores of the outer 0'002 to O'OOS, bars 0'002. 



Habitat. North Pacific, Station 237, off Japan, surface. 



2. Desmocampe tcenioides, n. sp. 



Inner cortical shell with six to ten chambers of nearly the same size and form ; the distal chambers 

 somewhat smaller. Every chamber kidney-shaped, with four to five transverse rows of irregular 

 roundish pores, twice to three times as broad as the bars. Outer cortical shell cylindrical, hemis- 

 pherical at both poles, with spiny surface; its pores like those of the inner, but the bars between 

 them much thinner. Distance between the two cortical shells equals the diameter of the outer 

 medullary shell. Both medullary shells lenticular. (Resembles Desmartiis larvalis, PI. 40, fig. 12, 

 but is without polar tubes.) 



Dimensions. Length of the six-chambered inner cortical shell 0'25, of the outer 0'3; greatest 

 lnvadth of the former 0'07,of the latter Oil; pores 0-005 to 0'012; bars of the inner shell 0'004, of 

 the outer O'OOl. 



Habitat. Pacific, central area, Station 268, depth 2900 fathoms. 



3. Desmocampe aphrodite, n. sp. 



Inner cortical shell with six to ten chambers of different size and structure. Both proximal 

 chambers kidney-shaped, with five to six transverse rows of subregular, circular, hexagonally-framed 

 pores, twice as broad as the bars. All following chambers cap-like, with much smaller, irregular, 

 roundish pores, on the base of each a circle of ten to twelve large square pores. Outer cortical shell 

 Cylindrical, on both poles hemispherical, with spiny surface and very delicate network of small poly- 

 -<m al pores. Both medullary shells spherical. (The inner cortical shell of this species resembles 

 that of Ommatocampe nereis, PI. 40, fig. 10 ; the outer that of Cyphocolpm rirrjinis, PL 40, 

 fit,'. 11.) 



