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



Dimensions. Diameter of the capsules O'l to 0'3, length of the spicula O'l to 0'2. 

 Habitat. North Pacific, Station 248, surface. 



Genus 14. Rhaphidozoum, 1 Haeckel, 1862, Monogr. d. Kadiol., p. 529. 



Definition. Sphserozoida with two or more different kinds of spicula ; one kind 

 simple, needle-shaped; the other kinds compound, radiate, or branched. 



The genus Rhaphidozoum differs from Sphcerozoum by the composition of the 

 skeleton of two or more different kinds of spicula, and has therefore the same relation 

 to it as the solitary Lampoxanthura to Lampoxanthella. 



In some species nearly all the different forms, which characterise the numerous species 

 ofBeloidea, may be united in one and the same individual. 



* 



Subgenus 1. Rhaphidonactis, Haeckel. 



Definition. Spicula of two different kinds ; one kind simple, needle-shaped, the 

 other radiate (composed of three, four, or more shanks, diverging from one common 

 point). 



1. Rhaphidozoum pelagicum, n. sp. 



Spicula of two different kinds ; one kind simple thin needles, a little curved or bent, the 

 other kind triradiate, with three thin, curved shanks. Both kinds smooth, without thoms. 

 Resembles a combination of Bclonozoum, italicum and Sphcerozoum triactinium. 



Dimensions. Diameter of the central capsules O'l to 0'12, length of the spicula O05 to O'lo. 



Habitat. Central Pacific, Station 267, surface. 



2. Rhaphidozoum pacificum, n. sp. 



Spicula of two different kinds ; one kind simple needles, stout and straight, pointed at both 

 ends, the other kind triradiate, with three straight and stout shanks. Both kinds thorny. 



Dimensions. Diameter of the central capsule O06 to 0'08, length of the spicula 0'05 to 01. 

 Habitat. Central Pacific, Station 271, surface. 



3. Rhaphidozoum acuferum, Haeckel. 



t 



Rhaphidozoum acuferum, Haeckel, 1862, Mouogr. d. Badiol., p. 529, Taf. xxxii. figs. 9-11. 

 Sphcerozoum acujerum, J. Miiller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 54, Taf. viii. fig. 3. 

 Thalassicolla acufera, J. Miiller, 1855, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 237. 



Spicula of two different kinds, simple needles and quadriradiate ; both strong, thorny, covered 

 with small spinules. Simple needles mostly curved, C-shaped. Four shanks of the quadriradiate 



1 Eluiphidozoum = Needle-animal ; j<p/s-, aov. 



