76 THE VOYAGE OF H.M.S. CHALLENGE^,. 



17. CarpospJimra maxima, n. sp. 



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

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



Dimensions. — Diameter of the outer shell 0-4, inner 0-08, pores and bars 0'004 to 0-008. 

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



18. Carposphcura nodosa, n. sp. (PL 28, figs. 2, 2a). 



Antltomma nodosum, Haeckel, 1879, Atlas, loc. cit. 



Cortical shell thick walled, covered with forty to fifty scattered pjTamidal 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 tlie bars. 

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

 Conosphcera, called Anthomma.) 



BiTnensions. — Diameter of the outer shell OlS, inner 0'05, inner and outer pores O'OOS to 

 0-012, bars 0-004. 



Hdlitat. — Central Pacific, Station 27l, depth 242.5 fathoms. 



Genus 20. LiosphcBra,^ Haeckel, 1881, Prodromus, p. 449. 



Definition. — L iosphjBrida with two cortical (extracapsular) shells (without a 

 medullary or intracapsular shell). 



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

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

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

 by radial beams piercing the capsule-wall, here in Liosplicera 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 CarposphcBra this distance is at 

 least as large as that radius (commonly much larger). In Carposp)liara 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. LiospluBra hexagonia, n. sp. (PI. 20, fig. 3). 



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



1 iiosp/in;r-a= Smooth spliere ; 'huo;, <r<pal^a. 



