220 ECHINODERMATA—ECHINOIDEA SUB-BRANCH IIT 
Koninckocidaris, Dollo and Buiss. Europe. Perischodomus, M‘Coy.  Car- 
boniferous ; Europe and North America. 
Archaeocidaris, M‘Coy (Palaeocidaris, Desor), (Fig. 352). Test large. Amb 
straight, reaching to the stoma; plates irregular, imbricating adorally. Ldmb 

Fie. 351. . 
A, Lepidocentrus Rhenanus, Beyr. Devonian; Wipperfiirth, Eifel. Cast of the interior of test showing jaws, 
1/; (after J. Miiller). B-D, Lepidocentrus Miilleri, Schultze. Devonian; Gerolstein, Eifel. B, Portion of Amb, 
enlarged. (C, Several IAmb plates, 1/3. D, Two detached [Amb plates, showing oblique edges, 1/. 
with three to seven columns of large thin plates, the median ones hexagonal, the 
adambulacral pentagonal or rounded. Median plates bevelled slightly over 
those on either side, and these over others to the ambulacral edge. Each 4m) 






























Fia. 352. 
o 
Archaeocidaris Wortheni, Hall. Sub-Carboniferous ; Burlington, lowa. 4, Portion of ventral region, showing 
jaws, 1/;._ B, An IAmb plate viewed from above and from the side. C, Portion of Amb, enlarged. D, Spine, 1/; 
(after Hall). 
plate with a large primary tubercle, surrounded by a large flat scrobicule and 
a circlet of granules. Primary spines large, usually serrated. Carboniferous 
Limestone ; Great Britain and North America. Permian; England. , 
Lepidocidaris, Meek and Worthen. Sub-Carboniferous; North America. 
Lepidechinus, Hall. Upper Devonian and Sub-Carboniferous ; North America. 
Xenocidaris, Schultze. Founded upon clavate spines from the Devonian of 
the Eifel. 
