Lower Palceozoic Rocks of the South of Scotland. 49 
the outer, so that in section the outer sphere has the appear- 
ance of an encircling ring. The framework of both outer and 
inner spheres apparently similar. No central medullary shell 
can be recognized. The minute structure of the mesh work is 
obscured by the dark infilling. Diameter of outer sphere 
•25, of the inner T5 ; length of radial beams ’015 millim. 
Rare. 
Distribution . Abington, Lanarkshire ; Hartree Hill, 
Peeblesshire. 
Family StaurosphaBrida, Haeckel. 
Sphaeroidea with four radial spines on the surface of the 
spherical shell, forming a regular cross, being opposite in 
pairs in two axes perpendicular to one another. (Chall. Rep. 
pt. i. p. 151.) 
Genus Staurodoras, Hasckel. 
Staurosphaerida with spongy spherical shell and four crossed 
simple spines. (Chall. Rep. pt. i. p. 168.) 
Staurodoras gracilis , sp. n. (PI. IV, fig. 7.) 
The siliceous mesh apparently of a close irregular character, 
with apertures of about *01 millim. wide. The radial spines 
slender, evenly tapering, about two thirds as long as the 
diameter of the shell. In the specimen figured one of the 
spines has been broken off. Diameter of the sphere T1 ; 
length of spines 0*7, thickness at base *01 millim. Another 
specimen has the spines stouter, measuring *02 millim. at the 
base. 
Three species of this genus have been described by Duni- 
kowski * from the Lower Lias of Schafberg, near Salzburg ; 
but in these the siliceous framework appears to be more 
regular and the spines stouter than in the present species. 
Distribution. Abington, Lanarkshire ; Hartree Hill, 
Peeblesshire. 
Genus Stauroplegma, gen. nov. 
Staurosphaerida with solid, irregularly reticulate or spongy 
shell, a concentric medullary shell, and four simple spines 
approximately in the form of a cross. This genus differs 
from Staurodoras by the possession of an inner medullary 
test. 
* Denkschr. d. k. Akad. d. Wiss. Wien, Bd. xlv. p. 188, pi. v. tLs. 56, 
57, 58. 
Ann . & Mag . N. Ilist . Ser. 6. Vol. vi. 
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