EEPOET ON THE RADIOLARIA. 17 



canals ; on its inside often numerous oval nucleoli. In the movable protoplasmic network between 

 the large alveoles a considerable number of large yellowish or orange oil-globules. Extracapsular 

 jelly-envelope very thin, contains small yellow bodies (zooxanthellae). (Compare the accurate 

 description of this Mediterranean species in my monograph and in Hertwig's work.) In the 

 Canary Islands I found very often a large variety of it, of double and triple the size, distinguished by 

 the delicate orange colour of the intracapsular oil-globules. This may be distinguished as Thalasso- 

 lampe aurantiaca. 



Dimensions. Diameter of the whole jelly-sphere 2 to 4 mm., of the central capsule 2 to 3 mm., 

 of its nucleus 0'2 to 0'4 mm. 



Habitat. Mediterranean, Messina, Haeckel, Hertwig; Canary Islands, Lanzerote, Haeckel ; 

 surface. 



2. Tlialassolampe maxima, n. sp. (PI. 1, fig. 2). 



Spherical body quite pellucid, like a glass globule, colourless. Central capsule with a moderately 

 thick, but quite transparent, structureless membrane, its diameter ten to twelve times as large as 

 that of the central spherical nucleus. Wall of the vesicular nucleus thick, perforated by fine pore- 

 canals ; on its inside numerous small spherical nucleoli. No large oil-globules in the movable 

 protoplasmic network between the large alveoles. Extracapsular jelly-envelope very thin, containing 

 no yellow bodies. This differs from the preceding nearly allied species in the want of the 

 intracapsular oil-globules and of the extracapsular yellow bodies. It possesses the largest central 

 capsule of all known Eadiolaria. I found them living and floating in water taken from the surface 

 of the Indian Ocean by a bucket. 



Dimensions. Diameter of the whole jelly-body 12 to 15 mm., of the central capsule 10 to 12 

 mm., of the nucleus - 8 to 1'2 mm. 



Habitat. Indian Ocean, near the Maldive Islands, Haeckel, 1882, surface. 



Genus 3. Thalassopila, 1 Haeckel, 1881, Prodromus, p. 469. 



Definition. Thalassicollida without extracapsular alveoles, but with large roundish 

 or globular alveoles within the central capsule, with a papillate or branched nucleus in 

 its centre. 



The genus Tlialassopila has, like Thalassolampe, a voluminous foamy central capsule, 

 inflated by numerous large alveoles ; but it differs in the complicated form of the nucleus, 

 which is like that of Tlialassophysa, and is either branched or occupied by conical or 

 roundish papillse. 



1. TJialassopila cladococcus, n. sp. (PI. 1, fig. 3). 



Spherical body dark-spotted, with a thin yellowish jelly-envelope. Central capsule with a thick 

 and firm membrane, perforated by pores ; its diameter three times that of the central nucleus, 



1 Thalassopila = Sea-ball ; 07ia<ro, *-/AB. 



(ZOOL. CHA.LL. EXI'. FART XL. 1885.) Rr 3 



