52 Dr. G. J. Hinde on Radiolaria from the 



test. Diameter of sphere -09, of inner test '03 ; length of 

 spines "075, basal thickness "01 millim. 



Distribution. Hartree Hill, Kilbucho, Peeblesshire. 



The genera described below, though embraced in the same 

 suborder — Sphseroidea — as the preceding forms, do not find 

 a place in any of the families of this group, as described by 

 Ha?ckel in the ' Challenger ' Eeport. They may possibly 

 represent new families ; but as their condition of preservation 

 and mode of occurrence are very unfavourable for a thorough 

 determination of their structural characters, I do not propose 

 to define their position in Hseckel's system, but shall limit 

 myself to giving generic and specific descriptions, so far as 

 these can be ascertained. 



Genus DORYSPH^RA *, gen. nov. 



Sphasroidea with simple spherical lattice-shells and a single 

 radial spine extending from the surface of the test. No 

 medullary test. 



Fossil forms of this genus have been already figured by 

 V. Dunikovvski from the Liassic strata of Schafberg, but no 

 name was given to them, possibly under the idea that they 

 were imperfect specimens of forms with normally two or four 

 radial spines. In this Ordovician chert, however, specimens 

 with but a single radial spine are not at all uncommon, and 

 they may be regarded as being iji their original condition. The 

 genus Lithapium t, Hseckel, has a simple lattice-shell, with 

 only a single radial spine ; but it is ellipsoidal or pear-shaped, 

 and thus is included in a different suborder. 



Dorysphcera reticulata^ sp. n. 

 (PI. III. fig. 3, PI. IV. fig. 3.) 



The framework of the shell thin, of an open, subpolygonal, 

 reticulate character, the meshes unequal in size, subcircular 

 to subpolygonal. Radial spine sliort, styliform. Diameter 

 of sphere "18, meshes from '005 to '015 millim., thickness of 

 framework about '005 millim. Radial spine (probably im- 

 perfect) '07, breadth of base "01 to '02 millim. 



Distribution. Abington, Lanarkshire ; Broughton Heights, 

 Peeblesshire. 



* hopv, a spear, a-t^aipa, sphere. 

 t ' Challenger ' Rep. pt. i. p. 303. 



