EEPOET ON THE RADIOLARIA. 773 



2. Loncliostaurus lanceolatus, n. sp. 



Four equatorial spines compressed, lanceolate, tapering equally from the middle towards the two 

 ends ; the two opposite spines of the longitudinal axis one and a half times as long as those of the 

 transverse axis. Sixteen smaller spines compressed, linear, two-edged, half as long and only one- 

 fourth as broad as the two longitudinal spines. 



Divicnsions. — Length of the equatorial cross 0"3, breadth 0'2. 



Habitat. — Central Pacific, Station 272, surface. 



3. Lonchostatirns bijidiis, u. sp. 



Four equatorial spines compressed, nearly rectangular, forked, with two long and thin, bent, 

 little divergent horns ; the two opposite spines of the longitudinal axis about one-third longer and 

 broader than those of tlie transverse axis. Sixteen smaller spines of the same form, also forked, but 

 the eight tropical only half as large, and the eight polar spines scarcely one-fourth as large as the 

 two longitudinal spines. 



Dhiunsions. — Length of the equatorial cross 0"36, breadth 0-26. 



Habitat. — South-west Pacific, Station 166, surface. 



4. Lonchostaurus hifurcus, n. sp. (PI. 131, fig. 4). 



Four equatorial spines nearly rhomboidal, about one and a half times as large as the eight tropical 

 and three times as large as the eight polar spines ; the two opposite spines of the longitudinal axis 

 only with two large divergent straight horns ; the two spines of the transverse axis somewhat 

 shorter, with four short horns (the two outer horns longer than the two inner). Eight tropical spines 

 doubly forked, each with four thin bristle-shaped horns. Eight polar spines very short, each with 

 two thin bristle-shaped, much divergent horns. 



Dimensions. — Length of the equatorial cross 0'34, breadth 0'28. 



Habitat. — North-west Pacific, Station 236, surface. 



5. Lonchostaurus rhombicus, n. sp. 



Four equatorial spines nearly rhomboidal, tapering from the broader middle towards the two 

 ends. Leaf-cross of their base very large. The two opposite sj^ines of the longitudinal axis about 

 one-third larger than the two spines of the transverse axis. Eight tropical spines of the same form, 

 but only half as large. Eight polar spines rudimentary, very short, conical. 



Dimensions. — Length of the equatorial cross 0'4, breadth 0'3. 



Habitat. — North Pacific, Station 253, surface. 



6. Lonchostaurus crystallinus, n. sp. (PL 131, fig. 5). 



Four equatorial spines lanceolate or rhomboidal, with broad leaf-cross at the base, of a pecuhar 

 crystalline structure and a lamellated surface, both opposite spines of the longitudinal axis twice as 



