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



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

 Habitat. — North Pacific, Station 248, surface. 



Genus 14. Rhaphidozoum,^ Haeckel, 1862, ]\Iouogr. d. Eadiol., p. 529. 



Dejinition. — Splieerozoida with two or more different kinds of spicula ; one kind 

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



The £^enus Rhaphidozoum differs from Spharozoum 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 LampoxanthiDXi to Lampoxanthdla. 



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

 of B e 1 o i d e a, may lie 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 hent, the 

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

 Eesembles a combination of Bdonozoitm italicum and Sphwrozoum trimtinium. 



Dimensions. — Diameter of the central capsules O'l to 0'12, length of the spicula 0'05 to O'l.'l. 



Habitat. — Central Pacific, Station 2G7, surface. 



2. Rhaphidozoum pacificum, n. sp. 



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

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



Dimensions. — Diameter of the central capsule 0'06 to 0'08, length of the spicula 0'05 to O'l. 

 Habitat. — Central Pacific, Station 271, surface. 



3. Rhaphidozoum acuferum, Haeckel. 



Rhaphiflozomn amferum, Haeckel, 1862, Monogr. d. Radio!., p. 529, Taf. xxxii. fio-s. 9-11. 

 Sphmrozotmi acufennn, J. MuUer, 1858,Abhandl. d. k. Akad. d. Wiss. Berlin, p. 54, Taf. viii. lie. 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 ciurved, C-shaped. Four shanks of the quadriradiate 



1 .B/Kijj/u'dosoijm = Needle-animal ; ^a.cpi?-,^uoa. 



