REPORT ON THE RADIOLARIA. 781 



7. Litho^itera darwinii, liaeckel. 



LithojJtera darwinii, Haeckel, 1879, Natiirl. Scliopfungsgesch., Aufl. vii. p. TOG, Tuf. 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. Four 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 

 irregiilar 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 tlie inner square 0'2. 



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



8. Lithoioteva 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 tliin, each with two 

 parallel rows. Four equatorial spines much larger and tliicker, 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. Mliller. 



Lithoxitera fenestrata, J. Miiller, 1858, Abliandl. d. k. Akad. d. Wiss. Berlin, p. 1.54, Taf. xi. 

 fig. 1.3. 



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. 



i}imemsio?is.— Diagonal of the square body 0-3 ; length of the inner sciuare 0-2. 



Habitat. — Mediterranean (Saint Tropez, Nice). 



Family XXXVIII. Amphilonchida, Haeckel (PL 132). 



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



Definition. — Acantharia with twenty radial spiues 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 A c a n t h o m e t r a 

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



