Lower Palteozoic Racks of the South of Scotland. 51 



between 20 and 60) radial spines on the surface of the splieri- 

 cal sliell ; living solitary. (Chall. Eep. pt. i. p. 206.) 



Genus ACANTHOSPH^RA, Ehrenberg. 



Astrosphserida with one simple lattice sphere, covered with 

 simple radial spines of the same kind. (Haeckel, Chall. Rep. 

 pt. i. p. 209.) 



Acanthosphoiva antiqua^ sp. n. (PI. 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 '16, of tlie pores '015 to "02 ; length of spines 

 •02, thickness at base '01 millim. Rare. 



Distrihution. Hartree Hill, Kilbucho. 



Genus Haliomma, Ehrenberg (in part) . 



Astrosphjerida 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. (Hseckel, Chall. 

 Rep. pt. i. p. 220.) 



Haliomma vetustwriy sp. n. (PI. II [. 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 'Ol'S ; 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 



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