REPORT ON THE RADIOLARIA. 25 



1. CoUozoum inerme, Haeckel (PI. 3, figs. 10-12). 



Collozoum inerme, Haeckel, 1862, Monogr. d. Radiol., p. 522, Taf. xxxv. 



Collozown inerme, Cienkowski, 1871, Archiv. f. iiiikrosk. Anat., vol vii. p. 376, Taf. xxix. 



figs. 18-36. 

 Collozoiim inerine, R. Hertwig, 1876, Histologie der Radiol., p. 12, Taf. i., ii. 

 Collozoum. inerme, R. Hertwig, 1879, Organismus d. Radiol, p. 31, Taf. iii. fig. 12. 

 Sphmrozown i7ierm>;J. Miiller, 1856, Monatsber. d. k. Akad. d. Wiss. Berlin, p. 478; Abhandl, 



p. 54. 

 Sphcerozown bicellulare, J. Miiller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 54, Taf. viii. fig. 5. 

 Thalassicolla punctata, Huxley (jnv pjcirte), 1851, Ann. and Mag. Nat. Hist., ser. 2, vol. viii. p. 433. 



Central capsules spherical, with thin, simple-edged membrane, with one single oil-globule in 

 the centre. (If the capsules multiply by division, the spherical form becomes violin-shaped, con- 

 stricted in the middle ; and in this condition the number of oil-globules increases ; but in the ordi- 

 nary mature state the capsule of this species remains spherical, and its oil-globule solitary. In 

 quite young capsules the oil-globules are wanting; PI. 3, fig. 12.) 



Dimensions. — Diameter of the central capsules 0'04 to 0"16. 



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

 Pacific), surface. 



2. Collozoum nostochinum, n. sp. 



Central capsules spherical, very large, opaque, distended with red pigment-granules and with 

 very numeroirs (two hundred to three hundred) small oil-globules. Membrane thick, double-edged. 

 Dimensions. — Diameter of the central capsules 0'3 to 05. 

 Habitat. — Indian Ocean, off Socotra, surface, Haeckel. 



3. Collozoum volvociniim, n. sp. 



Central capsules spherical, very large, opaque, containing a great number (ten to thirty) 

 of large oil-globules, and between them densely packed masses of dark pigment. Membrane thick, 

 double-edged. This species differs from Collozoum inerme, mainly by the great size of the central 

 capsules (three to five times as big as in the former) and the great number of oil-globules in them. 



Dimensions. — -Diameter of the central capsules 0'2 to 0'3. 



Habitat. — Central Pacific, Station 272, surface. 



Subgenus 2. Colloprmium., Haeckel. 

 Definition. — Form of the central capsules ellipsoidal, with one prolonged axis. 



4. Collozoum ovatum, n. sp. 



Collopriinum ovatum, Haeckel, 1882, Mauuscript. 



Central capsules ovate or ellipsoidal, its longer diameter twice to three times as large as the 

 shorter. In the centre of every cap.sule one single oil-globule. 



(ZOOL. CHALL. EXP. PAHT XL. — 1885). Et 4 



