1190 THE VOYAGE OF H.M.S. CHALLENGER. 



Subgenus 1. Calpocapsa, Haeckel. 

 Definition. Surface of the shell smooth or rough, but not spiny. 



1. Halicapsa lithapium, n. sp. (PI. 97, fig. 6). 



Shell pear-shaped, rough, one and a half times as long as hroad. Pores subregular, circular, 

 twice as broad as the bars. Basal plate with four larger ovate cortinar pores (two larger cardinal 

 and two smaller jugular), and with six smaller peripheral pores (fig. 6). Horn of the apex three- 

 sided pyramidal, stout, half as long as the shell. 



Dimensions. Shell 016 long, 01 broad; horn 0'08 long. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



2. Halicapsa triglochin, n. sp. (PI. 53, figs. 3, 4). 



Shell ovate, rough, a little longer than broad. Pores regular, circular, hexagonally framed, of 

 the same breadth as the bars. Basal plate (fig. 4) without larger pores. Horn pyramidal, stout, 

 about half as long as the shell, with three short, horizontally divergent secondary spines at the base 

 (possibly remnants of three original cortinar feet ?) 



Dimensions. Shell Oil long, 0'09 broad; horn 0'06 long. 



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



3. Halicapsa prunoides, n. sp. 



Shell pear-shaped, tuberculate, a little longer than broad. Pores irregular, roundish, of different 

 sizes. Basal plate with four larger and six smaller pores. Horn pyramidal, stout, about one-third 

 as long as the shell. (May belong perhaps to the similar Pruuoidea Lithapium, compare 

 p. 303 and PI. 14, figs. 8-10.) 



Dimensions. Shell 014 long, 012 broad ; horn 0'05 long. 



Habitat. Fossil in Barbados. 



Subgenus 2. Echinocapsa, Haeckel, 1881, Prodromus, p. 429. 

 Definition. Surface of the shell spiny, covered with thorns, papillae or larger spines. 



4. Halicapsa papillata, n. sp. 



Shell bottle-shaped, papillate, one and a half times as long as broad. Pores circular, much 

 larger in the middle part than towards the poles. The elevated frames between them bear on the 



