REPORT ON THE RADTOLAItlA. 397 



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

 (3ortical 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; luit this reticulated mantle is commonly not quite perfect and 

 more or less irregular. 



1. DesmocamiK' cateniila, n. sp. 



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

 sliaped, with three to four transverse rows of circular, sul^regular pores, twice as broad as the bars. 

 (3uter cortical shell cyhndrical, 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. (Eesembles Om inatocampe imlyarthra, 

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



Dimensions. — Length of the six-chamliered inner cortical shell 0-16, of tlie outer 0-21; 

 greatest breadth of each chamber of tlie former 0-05, of the latter 0-(i9; ]inres of tlie inner O'OOO, 

 liars 0-003; pores of the outer 0-002 to 0-008, bars 0-002. 



Hahiktf. — North Pacific, Station 237, off Japan, surface. 



2. Desmocampe tcenioides, u. 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 tlie bars between 

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

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

 Viut is without polar tubes.) 



Dimimsio7is. — Length of the six-chambered inner cortical shell 0-25, of the outer 0-3; greatest 

 breadth of the former 0-07, of the latter O'll; pores O'OOo to 0-012; bars of the inner shell 0-004, of 

 the outer O'OOl. 



Mahitat. — Pacific, central area. Station 268, depth 2900 fathoms. 



3. Desmocam2'>e 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-hke, with much smaller, irregular, 

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

 cyhndrical, on both poles hemispherical, with spiny surface and very dehcate network of small poly- 

 gonal pores. Both medullary shells spherical. (The inner cortical shell of this species resemljles 

 that of Ommatocampe nereis, PI. 40, fig. 10 ; the outer that of C/jiihoeolpus virrjinis, PL 40, 

 fig. 11.) 



