REPORT ON THE RADIOLARIA. 245 



2. Leptosphcera serrata, n. sp. 



Inner shell with regular, hexagonal meshes, five to six times as broad as the bars ; outer shell 

 three times as broad, with simple triangular meshes. Radial spines with three serrated edges (of 

 the same form as the main spines of Drymosphcera dendrophora, PI. 20, fig. 1). 



Dimensions. Diameter of the outer shell 045, of the inner 0'15. 



Habitat. Central Pacific, Station 271, surface. 



3. Lcptosplwera polygonalis, n. sp. 



Inner shell with irregular, polygonal meshes and very thin thread-like bars ; outer shell 

 twice as broad, with simple triangular meshes. Radial spines with three smooth edges. 

 (Resembles Drymospheura, polyyonalis, PI. 19, fig. 1, but has no by-spines.) 



Dimensions. Diameter of the outer shell 0'3f>, inner 0'175. 



Habitat. North Pacific, Station 256, surface. 



Subgenus 2. Leptospliceromma, Haeckel. 



Definition. Radial spines with three rows of lateral branches (one row on 

 each edge). 



4. Leptosphcera ciliata, n. sp. 



Inner shell with regular, hexagonal meshes and very thin thread-like bars ; outer shell three 

 times as broad, with simple triangular meshes. Radial spines with smooth edges and three rows 

 of simple, smooth, curved, lateral branches (six branches on each edge), similar to those of Diplospkwra 

 gracilis. 



Dimensions. -Diameter of the outer shell 0'6, inner 0'2. 



Habitat. South Atlantic, Station 325, surface. 



5. Leptosphcera spinosa, Haeckel. 



Diplosphcera spinosa, R. Hertwig, 1879, Organismus d. Radiol., p. 40, Taf. v. fig. '2. 



Inner shell with regular, hexagonal meshes, five times as broad as the bars ; outer shell three 

 times as broad, with simple triangular meshes. Radial spines with three densely serrated edges, 

 and with three rows of serrated, simple, curved, lateral branches (three branches on each edge). 

 Differs from the preceding in the thicker bars and the elegantly denticulated spines and branches. 



Dimensions. Diameter of the outer shell 0'66, inner 0'22. 



Habitat. Mediterranean (Messina), R. Hertwig. 



6. Leptosphcera stcllata, n. sp. 



Inner shell with regular, hexagonal meshes, six times as broad as the bars, each bar crossed 

 by a transverse tangential rod, so that each mesh represents an elegant six-rayed star (as 



