Loioer PaJceozoic Rocls of the South of Scotland. 53 



Dorysphivra nucula^ sp. n. (PI. III. fig. 5.) 



The shell smaller and the framework thicker than in the 

 preceding form. Pores subcircular. Radial spine short, 

 styliform. Diameter of shell *13, pores 'Ol, intermediate 

 spaces about '007 ; spine '03, thickness at base '02 millira. 

 Rare. 



Distribution. Hartree Hill, Kilbucho, Peeblesshire. 



Dorysphcnra laxa^ sp. n. (Pi. HI. 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 "12, 

 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 Doeyplegma *, 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, Hseckel, 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 medullary 

 shell. 



Doryplegma nasuturUj 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 "ll, 

 thickness at base "02 ; length of secondary spines '015 millim. 

 Specimens not infrequent. 



Distribution. Hartree Hill; Broughton Heights, Peebles- 

 shire. 



* bopvy a spear, TrX/y/io, network. 



