76 THE VOYAGE OF H.M.S. CHALLENGEK. 



17. Carposphcera maxima, n. sp. 



Cortical shell thin walled, smooth, five times as broad as the medullary shell, with irregular 

 roundish pores, of about the same breadth as the bars. 



Dimensions. Diameter of the outer shell 0'4, inner O08, pores and bars O004 to O008. 

 Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



18. Carposphcera nodosa, n. sp. (PI. 28, figs. 2, 2a). 



Anthomma nodomm, Haeckel, 1879, Atlas, loe. cit. 



Cortical shell thick walled, covered with forty to fifty scattered pyramidal nodules, two and a 

 half times as broad as the medullary shell, connected with it by very numerous thin radial beams. 

 Outer and inner pores irregular roundish or polygonal, two to three times as broad as the bars. 

 (This species in consequence of the cortical nodules may represent a peculiar genus, analogous to 

 Conosphcera, called Anthomma.) 



Dimensions. Diameter of the outer shell 0'13, inner 0'05, inner and outer pores O'OOS to 

 0-012, bars 0'004. 



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



Genus 20. Liosphcera, 1 Haeckel, 1881, Prodromus, p. 449. 



Definition. Liosphaerida with two cortical (extracapsular) shells (without a 

 medullary or intracapsular shell). 



The genus Liosphcera agrees with the preceding Carposphcera in the possession of 

 two concentric latticed spheres ; but whilst in the latter genus the inner sphere is a 

 medullary one (intracapsular), the outer a cortical shell (extracapsular), both connected 

 by radial beams piercing the capsule-wall, here in Liosphcera the central capsule lies 

 freely within the inner lattice shell and is not pierced by radial beams. Therefore both 

 shells are here cortical shells, both separated by a distance, which is constantly much 

 smaller than the radius of the inner shell ; whereas in Carposphcera this distance is at 

 least as large as that radius (commonly much larger). In Carposphcera the number 

 of pores in both shells is never the same ; in several species of Liosphcera this number 

 is the same, each outer regular hexagonal pore exactly corresponding to an inner ; the 

 six corners of each connected by six short radial beams. 



Subgenus 1. Melitomma, Haeckel. 

 Definition. Pores of both shells regular, in each shell all of nearly equal size and form. 



1. Liosphcera hexagonia, n. sp. (PL 20, fig. 3). 



Both shells with the same number of pores, exactly corresponding, about ten on the quadrant. 



1 Liosphcera= Smooth sphere ; 



