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



be of an equally close character throughout the test, the inter- 

 spaces are very minute, showing sometimes as minute circular 

 pores about '005 millim. in diameter, sometimes as sinuous 

 apertures. Surface usually smooth and even, occasionally 

 with minute spines. Diameter of test ranging from '15 

 to "24 millim. 



Distribution'^. Abington, Lanarkshire; Broughton, Har- 

 tree Hill, Peeblesshire. 



Genus Spongoplegma, Hasckel. 



Liosphgerida forming a sphere of spongy framework, which 

 encloses in the centre one single latticed medullary shell. 

 (Chall. Rep. part i. p. 89.) 



Spongoplegma priscum J sp. n. (PL III. fig. 2.) 



The surface of the cortical shell relatively smooth, with 

 apparently regular apertures, the reticulate or spongy frame- 

 work between the cortical and the medullary shell with circular 

 or irregular apertures about '01 millim. wide ; the medullary 

 shell well marked by its closer and denser structure. The 

 specimen figured is shown in section. Diameter of cortical 

 shell '15 to '2 millim., thickness of shell -012 millim. ; width 

 of medullary shell '075 millim. 



Distribution. — Hartree Hill, Kilbucho, and Broughton 

 Heights, near Broughton, Peeblesshire. 



Genus DiPLOPLEGMA, gen. nov.f 



Liosphgerida with a relatively large inner (cortical?) test of 

 irregularly reticulate or spongy framework and an outer shell 

 of the same structure, the two connected by radial bars. In 

 this genus the inner test is sufficiently large to be regarded as 

 an inner cortical shell, and in this respect it resembles Lio- 

 sphoeraj Hteckel (' Challenger ' Report, pt. i. p. 76), which 

 has two cortical shells. It differs from Liosphcera, however, 

 in the irregularly reticulate or spongy nature of the tests. 



Diploplegma cinctuin, sp. n. (PI. IIL fig. 10.) 



Surface of outer test uneven, but without definite spines. 

 The inner test connected by numerous short radial bars with 



* As all the specimens are from the same geological horizon (Llandeilo- 

 Caradoc) referred to in the previous part of the paper, it is not necessary 

 to indicate it in connexion with each species. 



t fiiTrXdos, double, vXty^a, network. 



