REPORT ON THE RADIOLARTA. 43 



8. Sph(erozoum trir/emiimm, u. sp. 



Spicula all (oi- nearly all) geiuinate-triradiate, composed of a short simple axial middle 

 rod and three simple needle-like shanks on each end of it. Shanks curved or bent, very thin, 

 smooth, commonly much longer than the middle rod. (Often few quadriradiate or few thorny tri- 

 radiate spicules are interspersed among the others.) 



Dimensions. — Length of tlie middle rod of the spicula 0-02 to 0'04, of its shanks 0'03 to 0-09. 



Habitat. — North Pacific, Stations 244 to 248, surface. 



9. Sphcerozoum punctatuni, J. Miiller. 



Sphcerozoum puncfatum, J. Miiller, 1858, Ahhandl. d. k. Akad. d. Wiss. Peiliu, ji. 5i, Taf. viii. 



figs. 1, 2. 

 Spliceroxown punctatum, Haeckel, 1862, ilonogr. d. Radiol., p. 528, Taf. xxxiii. figs. 7-9. 

 Sx>h(erozoum fuscum, Meyen, 1834, Nova Acta Acad. Nat. Cur., vol. xvi. Taf. xxxviii. fig. 7. 

 Thalassicoll a pnnc.fata, Huxley, 1851, Ann. and Mag. Nat. Hist., ser. 2, vol. viii. p. 434, 



pi. xvi. figs. 1, 2, 3. 



Spicula all (or nearly all) geminate-triradiate, composed of a long simple axial middle rod 

 and three simple needle-Hke shanks on each end of it. Shanks straight, pointed, thorny, with many 

 small spines, commonly somewhat shorter than the midcUe rod. (Often few furcate or foiir-rayed 

 spicula are intermingled, or some of the spicula are smooth.) This cosmojjolitan species is extremely 

 variable, and produces interesting transitional forms to many other sj)ecies of the genus. Com- 

 pare also the general remarks on the genus, and the chapter on " Transformation " in the general 

 introduction.' 



Dimensions. — Length of the middle rod of the spicula 0'02 to O'OG, of its shanks 0-01 to 0-05. 



Habitat. — Cosmopolitan, common in nearly all warmer seas, Mediterranean, Atlantic, Indian 

 Ocean, Pacific ; surface. 



10. Sphcerozoum armatum, n. sp. (PL 4, figs. 1, 9). 



Spicula all geminate-triradiate, with a stout and short middle rod and three arborescent shanks 

 on each end of it. Shanks longer than the middle rod, very stout, straight, pine-shaped, with six to 

 twelve irregular, spinulated, lateral branches. 



Dimensions. — Diameter of the central capsules 0'04 to O'OS, length of the middle rod of the 

 spicula 0-02 to 0-03, of its shanks 0-05 to 0-08. 



Habitat. — North Pacific, Japan, Station 239, surface. 



11. SplicBrozoum alveolatum, n. sp. (PL 4, figs. 2, 3). 



Spicula all together geminate-triradiate, with a simple stout middle rod and three arborescent 

 shanks on each end of it. Shanks more or less curved, slender, pine-shaped, witli four to eight short, 

 thorny lateral branches. In all coenobia of this remarkable species the central capsules are enclosed 

 in large thick-walled alveoles (of three times tlieii' breadth), and in each alveole is placed besides 



