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



long as the radius, zigzag, with short denticles. Eadial 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 OOl to 0-025, bars 

 0-004 



Hcdiitut. — Central Pacific, Stations 271 to 274, surface. 



4. Lychnaspis seyrata, n. «}». 



Parmal meshes pentagonal, three to four times as liroad 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 U-03, 

 bars 0004. 



Habitat. — South Atlantic, Station 330, surface. 



5. Lyclmaspis wagenscJiieberi, 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 (al)out 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 Lyclmaspis iMlyancistra, of which the late excellent 

 engraver Wagenschieber, of Berlin, has given such a beautiful figure in my monogiaph (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 jjolyancistni, Haeekel. 



Dorataainn potijancidra, Haeekel, 18G2, Monogr. d. liadiol., p. llS, Taf. .\xi. figs. 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 Ijluut denticles. Piadial main-spines stout, in the inner half cylin- 

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



Dimensions. — Diameter of the shell 0-12, parmal pores 0-012, sutural pores Q-Ol to 0-04, bars 

 0-004. 



Habitat. — Mediterranean (Messina), surface. 



