Lower Paheozoic Rocks of (he South of Scotlun 1. ")1 



l)et\veen 20 and fiO) radial si)ine3 on the snrfiice of the splieri- 

 cal shell ; living solitary. (Chall. Rep. pt. i, p. 200.) 



Genus Acanthospilera, Ehrenberg. 



Astrosphrerida with one simple lattice sphere, covered with 

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

 pt. i. p. 209.) 



Acanthosphfira 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 whicii 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 'IG, of the ))orcs "015 to "02 ; length of spines 

 •02, thickness at base "01 millitn. Rare. 



Distribution. Hartree Hill, Kilbucho. 



Genus HaliOMMA, Ehrenberg (in part) . 



Astrosphferida with one medullary (intracaj)sular) 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. (Hteckel, 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 iiuier test 

 '08, pores '013; length of spines '06, thickness at base '02 

 miilim. 



Distribution. Hartree Hill, Kilbucho, Peeblesshire. 



Haliomma cornutumy 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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