51 
Lower Paleozoic Rocks of the South of Scotland. 
between 20 and 60) radial spines on the surface of the spheri- 
cal shell ; living solitary. (Chall. Eep. pt. i. p. 206.) 
Genus Acanthosph^era, Ehrenberg. 
Astrosphasrida with one simple lattice sphere, covered with 
simple radial spines of the same kind. (Haeckel, Chall. Rep. 
pt. i. p. 209.) 
Acanthosphcerci antiqua , sp. n. (PL IV. fig. 1.) 
Shell thin-walled, pores subcircular and wider than the 
inclosing framework. Spines short, conical, apparently 
numerous, though, owing to the way in which the specimen 
figured has been infilled with dark staining material, only 
those near the outer margin can be clearly seen. The missing 
part of the specimen figured has been cut off by a quartz- vein. 
Diameter of test T6, of the pores *015 to *02 ; length of spines 
*02, thickness at base *01 millim. Rare. 
Distribution . Hartree Hill, Kilbucho. 
Genus Haliomma, Ehrenberg (in part) . 
Astrosphaerida with one medullary (intracapsular) and one 
cortical (extracapsular) shell, which are connected by radial 
beams piercing the central capsule. Shell-surface covered 
with simple radial spines of the same kind. (Haeckel, Chall. 
Rep. pt. i. p. 220.) 
Haliomma vetustum ) sp. n. (PI. III. fig. 11.) 
Cortical test moderately thick, with small circular pores and 
relatively robust, short, conical spines, of which there are nine 
on the surface exposed. The specimen figured is partly a 
section ; there are no traces of radial beams connecting the 
inner with the outer test ; their apparent absence may be due 
to the fossilization. Diameter of sphere *22, of the inner test 
*08, pores *013; length of spines ’06, thickness at base *02 
millim. 
Distribution . Hartree Hill, Kilbucho, Peeblesshire. 
Haliomma cornutum ) sp. n. (PI. IV. fig. 8.) 
In the specimen figured the characters of the cortical test 
are obscured by the dark infilling, and the inner test is only 
indicated by a lighter area. There are at least seven equal, 
slender, tapering spines nearly as long as the diameter of the 
4* 
