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



incomplete, and no figure is given with it, it remains doubtful whether his Mediterranean species 

 be identical with my Atlantic variety.) 



Dimensions. Diameter of the outer shell 012, of the inner 0'04 ; pores of the former 0'04, of 

 the latter O'OOS ; length of the spines 0'06. 



Habitat. Mediterranean (Grecian shore) ; North Atlantic, Station 354, surface. 



13. Haliomma oculatum, Ehrenberg. 



Haliomma oculatum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berliii, p. 74, 

 Taf. xxviii. figs. 2, 3. 



Cortical shell thick walled, four times as broad as the medullary shell ; its pores regular, 

 circular, four times as broad as the bars, six to eight on the radius. Pores of the medullary shell 

 regular, hexagonal, with very thin bars, three to four on the radius. Nine radial spines, regularly 

 disposed, conical, as long as the radius, as broad at the base as one cortical pore. (In the specimen 

 figured by Ehrenberg, only two spines were preserved, seven being accidentally broken off.) 



Dimensions. Diameter of the outer shell 016, of the inner 0'04 ; pores of the former O'Ol, of 

 the latter O'OOS. 



Habitat. Fossil in Barbados. 



14. Haliomma enneaxiphos, n. sp. 



Cortical shell thick walled, four times as broad as the dark medullary shell, with regular, 

 circular, hexagonally framed pores, twice as broad as the bars ; eight to ten on the radius. Nine 

 radial spines, regularly disposed, three-sided pyramidal, as long as the radius, as broad at the base 

 as one mesh. 



Dimensions. Diameter of the outer shell Oil, of the inner 0'03 ; cortical pores O'OOS, bars 

 0-004; length of the radial spines 0'05, basal breadth 0'012. 



Habitat. Central Pacific, Station 272, surface. 



15. Haliomma tenuispinum, J. Miiller. 



Haliomma tenuispinum, J. Miiller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 39, Taf. iv. 



fig. 9. 

 Haliomma tenuispinum, Haeckel, 1862, Monogr. d. Eadiol., p. 431. 



Cortical shell thin walled, three times as broad as the medullary shell. Both shells with very 

 fine, thread-like bars, and regular, hexagonal pores ; five to seven on the radius. Twenty radial spines, 

 very thin, bristle-shaped, as long as the radius. 



Dimensions. Diameter of the outer shell 012, of the inner 0'04 ; pores of the former O'OIG, of 

 the latter O'OOG. 



Habitat. Mediterranean (Nice) ; North Atlantic, Station 353, surface. 



