REPORT ON THE RADIOLARIA. 19 



1. Thalassicolla pellucida, n. sp. 



Spherical body very soft, transparent, clear and colourless, without any pigment. Central 

 capsule soft, hyaline, with a thin, structureless, not areolated membrane. Diameter of the central 

 capsule about three times that of the nucleus, one-fourth to one-sixth that of the jelly-envelope. 

 Nucleus delicate, transparent, with one single central nucleolus, about one-third its diameter. 

 Protoplasm of the central capsule contains only small, pellucid, densely packed globules (vacuoles ?), 

 no oil-globules. Extracapsular body quite transparent, without pigment or oil-globules, only 

 composed of the large alveoles imbedded in the jelly-cover, and of the fine protoplasmic network 

 between them. No xanthellse. 



Dimensions. Diameter of the central capsule 0'8 to 1'2, of the nucleus 03 to 0'4, of the calymma 

 3 to 6 mm. 



Habitat. Cosmopolitan, Canary Islands, Haeckel ; Cape, Australia, Pacific, Challenger ; surface. 



2. Thalassicolla spumida, n. sp. 



Spherical body nearly transparent, yellowish, without dark pigment. Central capsule pellucid, 

 with a thick, structureless, not areolated membrane. Diameter of the central capsule about twice 

 that of the nucleus, one-sixth to one-eighth that of the jelly-cover. Nucleus delicate, somewhat 

 opaque, with numerous small nucleoli. Protoplasm of the central capsule contains small pellucid 

 globules (vacuoles ?), and immediately under its membrane (on its inside) one single layer of large, 

 dark, refractive oil-globules. Extracapsular body very voluminous, foamy, with innumerable alveoles 

 in the jelly, and many xanthellae between them. 



Dimensions. Diameter of the central capsule 06 to O8, of the nucleus 0'3to04, of the calymma 

 3 to 5 mm. 



Habitat. Atlantic, Canary Islands, Haeckel ; Cape Verde Islands, Challenger Station 350 ; 

 Brazil, Eabbe ; surface. 



3. Thalassicolla zanclea, Haeckel. 



Thalassicolla zanclea, Haeckel, 1862, Monogr. d. Eadiol., p. 252, Taf. ii. fig. 3. 



Spherical body opaque, transparent only in the periphery, with colourless central capsule, but 

 with brown or black pigment-powder scattered everywhere through the extracapsular alveolated 

 jelly-cover. Central capsule soft, transparent, colourless, with a thin structureless, not areolated 

 membrane. Diameter of the central capsule about one and a half tunes that of the nucleus, one-half 

 or one-third that of the jelly-cover. Nucleus delicate, transparent, with a thin, finely punctated 

 membrane, with one or more nucleoli. Protoplasm of the central capsule contains only small, 

 pellucid, densely packed globules (vacuoles ?), no oil-globules. Extracapsular body very dark 

 and opaque, with a great mass of brown or blackish-brown pigment between the alveoles of the jelly- 

 cover. Numerous xanthellae. 



Dimensions. Diameter of the central capsule O'l to 0'12, of the nucleus O'O 1 ? to 0'08, of the 

 calymma - 2 to O4. 



Habitat. Mediterranean, Messina, Haeckel. 



