REPORT ON THE RADIOLARIA. 781 



7. Lithoptera darwinii, Haeckel. 



Lithoptera darwinii, Haeckel, 1879, Natiirl. Schbpfungsgesch., Anfi. vii. p. 706, Taf. xvi. tig. 12. 



All twenty spines with transverse apophyses ; these are quite simple in the eight small cross- 

 shaped polar spines ; also simple, but bearing some perpendicular rods, in the eight thin tropical 

 spines. Pour equatorial spines very large and stout, each crossed by four transverse beams, which 

 are connected by eight to ten rods parallel to the spine (therefore each wing with three rows of 

 irregular rectangular meshes). Wings placed in the equatorial plane and grown partly together by 

 their meeting lateral ends. 



Dimensions. Diagonal of the square body 0'4 ; length of the inner square 0'2. 



Habitat. South-enst Pacific, west coast of Patagonia, Station 302, surface. 



8. Lithoptera icosaptera, n. sp. 



All twenty spines with transverse apophyses, bearing one to three rows of rectangular meshes ; 

 eight polar spines small, each with a single row; eight tropical spines long and thin, each with two 

 parallel rows. Four. equatorial spines much larger and thicker, each with three parallel transverse 

 rows of meshes. All twenty wings free, not grown together by their lateral ends. 



Dimensions. Diagonal of the square body 048 ; length of the inner square 0'24. 



Habitat. -Indian Ocean, Belligemma, Ceylon (Haeckel), surface. 



9. Lithoptera fenestrata, J. Miiller. 



Lithoptera fenestrata, J. Miiller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 154, Taf. xi. 

 fig. 13.' 



All twenty spines with transverse apophyses, bearing one to three rows of irregular, rectangular 

 meshes ; eight polar and eight tropical spines small, each with a single row of meshes (between 

 two parallel transverse beams). Four equatorial spines little larger, each with two rows (between 

 three parallel transverse beams). Central capsule filled up with green pigment. 



Dimensions.- Diagonal of the square body 0'3 ; length of the inner square 0'2. 



Habitat. Mediterranean (Saint Tropez, Nice). 



Family XXXVIII. AMPHILONCHIDA, Haeckel (PL 132). 



Acantholonchida (Amphilonchida et Ampliilithida), Haeckel, 1881, Prodromus, p. 466. 



Definition. ACANTHARIA with twenty radial spines of very unequal size, dis- 

 posed according to the law of the Icosacantha ; two opposite equatorial spines (in the 

 longitudinal axis) much larger than the eighteen others. No lattice-shell. 



The family Amphilonchida is distinguished from all other Acanthometra 

 by the excessive development of two opposite equatorial spines, which are much larger 



