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



long as the radius, zigzag, with short denticles. Kadial spines very long and stout, quad- 

 rangularly-prismatic, with four smooth edges. 



Dimensions. Diameter of the shell 0"3, parmal pores 0'03, sutural pores O'Ol to 0'025, bars 

 0-004. 



Habitat. Central Pacific, Stations 271 to 274, surface. 



4. Lychnaspis serrata, u. sp. 



Parmal meshes pentagonal, three to four times as broad as the thick bars, smaller than the 

 irregular sutural meshes. By-spines (two hundred to three hundred) scarcely one-third as long as 

 the radius, zigzag, with strong denticles. Eadial spines very long, stout, quadrangularly-prismatic, 

 with four serrated edges. 



Dimensions. Diameter of the shell 0'22, parmal pores 0'015, sutural pores 0'012 to 0'03, 

 bars 0-004. 



Habitat. South Atlantic, Station 330, surface. 



5. Lychnaspis ivagenschieberi, n. sp. 



Parmal meshes tetragonal, nearly rhombic, three to four times as broad as the thick bars, 

 smaller than the large irregular sutural meshes. By-spines (about two hundred) large, as long 

 as the radius, with long recurved denticles, very zigzag. Radial main-spines very long, four- 

 sided prismatic. This species differs by the form and size of the spines, and by the square 

 form of the parmal pores from the similar Lychnaspis polyancistra, of which the late excellent 

 engraver Wagenschieber, of Berlin, has given such a beautiful figure in my monograph (Taf. xxi. 

 fig. 8). 



Dimensions. Diameter of the shell 0'16, parmal pores 0'014, sutural pores 0'015 to 0'02, 

 bars 0-004. 



Habitat. Central Pacific, Station 266, surface. 



6. Lychnaspis polyancistra, Haeckel. 



DorataJipia polyancistra,, Haeckel, 1862, Monogr. d. Kadiol., p. 418, Taf. xxi. tigs. 7-9. 



Parmal meshes roundish, tetragonal, or nearly square, two to three times as broad as the thick 

 bars, smaller than the irregular sutural meshes. By-spines (about two hundred) thin, half as long 

 as the radius, zigzag, with blunt denticles. Radial main-spines stout, in the inner half cylin- 

 drical, in the outer half (of the same length) conical, pointed. 



Dimensions. Diameter of the shell 012, parmal pores 0'012, sutural pores O'Ol to 0'04, bars 

 0-004. 



Habitat. Mediterranean (Messina), surface. 



