Lower Palaeozoic Rocks of the South of Scotland . 53 
Dorysphcera nucula , sp. n. (PL III. fig. 5.) 
The shell smaller and the framework thicker than in the 
preceding form. Pores subcircular. Radial spine short, 
styliform. Diameter of shell T3, pores *01, intermediate 
spaces about *007 ; spine *03, thickness at base *02 millim. 
Rare. 
Distribution . Hartree Hill, Kilbucho, Peeblesshire. 
Dorysphcera laxa , sp. n. (PI. III. fig. 4.) 
Framework of test thin, reticulate, the meshes subcircular, 
unequal, relatively large. Spine short, in the specimen 
figured it is seen projecting obliquely. Diameter of shell T2, 
mesh-apertures from *01 to *025 millim. in width, intermediate 
framework about *007, thickness of base of spine *015 millim. 
This form differs from D . reticulata principally in the distinctly 
larger size of the mesh-apertures. 
Distribution. Abington, Lanarkshire ; Hartree Hill, 
Peeblesshire. 
Genus Doryplegma *, gen. nov. 
Sphseroidea with cortical shells of irregularly reticulate or 
spongy framework, inclosing a central medullary shell and 
with a single primary radial spine. Secondary or smaller 
spines occasionally present. The structure of the shell in 
this genus is the same as in Spongoplegma , Haeckel, but with 
the addition of a radial spine and sometimes of secondary 
spines. From Dorysphcera it is distinguished by the different 
character of the framework and the presence of a medullar v 
shell. 
Doryplegma nasutum , sp. n. (PI. III. fig. 9.) 
The wall of the sphere well marked and distinct from the 
reticulate structure of the space within. Radial spine conical, 
tapering, shorter than the diameter of the sphere; secondary 
spines small, acute, in some specimens none can be distin- 
guished. The lower portion of the specimen figured has been 
displaced by a quartz-vein, and the interior structure is only 
partially shown. Diameter of sphere *2, of medullary test 
*08, thickness of cortical shell *017 ; length of radial spine *11, 
thickness at base *02 ; length of secondary spines *015 millim. 
Specimens not infrequent. 
Distribution . Hartree Hill ; Broughton Heights, Peebles- 
shire. 
* dopv, a spear, nXeypa, network. 
