REPORT ON THE RADIOLARIA. 15 



major axis, on both poles of the ni;cleus-asis, two large oil-globules, half as large as the nucleus. 

 Calymma ellipsoidal, with numerous xanthellis ; its diameter four times as large as that of the 

 capsule. 



Dimensions. — Major axis of the capsule 0'2, minor 0"12 ; major axis of the nucleus 0'07, minor 

 0-04 ; major axis of the calymma 0'8, minor 0"5. 



Habitat. — Mediterranean, Corfu, 187*7, Haeckel, surface. 



Subgenus 3. Actidiscus, Haeckel, 1882. 

 Definition. — Central capsule lenticular, witli one shortened axis. 



7. Actissa discoides, n. sp. 



Actidiscus discoides, Haeckel, 1882, Manuscript. 



Central capsule lenticiilar, red-coloured, about twice as broad as high, with a thick, double-edged 

 membrane. Nucleus spherical, one-third as broad as the capsule, with one single, large central 

 nucleolus. Protoplasm dusky, filled with scarlet pigment ; granules and small oil-globules between 

 them. Calymma lenticular, three times as broad as the capsule. 



Dimensions. — Major axis of the capsule 0"16, minor O'OS ; diameter of the nucleus 0"05 ; 

 breadth of the calynama 0'5. 



Halitat. — North Pacific, Station 236, surface. 



8. Actissa lenticularis, n. sp. 



Central capsule lenticular, flattened, about three times as broad as high, with a thin, simple- 

 edged membrane. Nucleus lenticular, one-third as large as the capsule, with ten small dark nucleoli. 

 Protoplasm transparent, colourless, filled with small vacuoles at regular distances ; on the inside of 

 the membrane in the circular periphery of the lens twenty dark oil-globules. Calymma lenticular, 

 twice as broad as the capsule. 



DiTnensions. — Major axis of the capsule 0"15, minor 0'05 ; breadth of the nucleus 0'05, height 

 0-02 ; breadth of the calymma 0-03. 



Habitat. — East Pacific, Station 272, surface. 



9. Actissa pliacoldes, n. sp. 



Actidiscus phacoides, Haeckel, 1882, Manuscript. 



Central capsule lenticular, strongly flattened, about four times as broad as high, with a thin, 

 simple-edged membrane. Nucleus lenticular, one-fourth as broad as the capsule, with numerous 

 (twenty or more) small nucleoli. Protoplasm filled with dark pigment-granules ; on the inside of 

 the membrane in the circular periphery of the lens thirty-two dark oil-globules. Calynxma lenti- 

 cular, three times as broad as the capsule. 



