BRITISH RADIATA. 
1. Echinarachnius placenta. 
Echinaraelinms, Leske ; Klein, t. 20. fig. a, h ; cop. E. M. t. 143. 
figs. 11, 12. 
Ecliinaraclinius placenta, Flem. Brit. An. 479; Gray, Ann. Phil. 
6; Agassiz, Prod.', Forbes, Brit. Starf. 178. figs. 178, 181. 
Echinus placenta, Gmelin, S. N. 
Scutella placenta, Lamk. H. iii. 11, edit. 2. hi. 283; Desmoul. 
Echid. 228. 
Echinodiscus placenta, Blainv. Die. S. N. lx, 199 ; Man. Act. 218. 
Inhah. Zetland. 
2. Echinocyamus. 
Echinocyamus, Leske; Klein, Echid.; Gray, Ann. Phil. 1825, 
6; Fleming, Brit. An. 481, 1828; Blainv. Diet. S. iV. lx. 195. 
Fihularia, Lamk. Hist. 1816; Agassiz, Prod. Ann. N. H. i. 303. 
Echinoneus, sp. Goldfuss. 
1. Echinocyamus pusillus. 
Spatangus pusillus, Muller, Zool. Dan. 18. t. 91. figs. 5, 6. 
Echinocyamus pusillus, Flem. Brit. An. 481; Forbes, Brit. Starf. 
175 . fig.; Gray, Ann. Phil. x. ; Agassiz, Monog. Scut, t. 27- 
fig. 1-8. 
Echinus ovalis depressus. Walker, Test. M. R, 25. t. 3. fig. 88. 
Ovulum marinum, Borlase, Cornw. t. 28. fig. 26. 
Echinus perexiguus, Pet. Gaz. t. 31. fig. 10. 
Echinus minutus, Gmelin, S. N. 3194. 
Echinocyamus minutus, Blainv. M. Act. 214. 
Fihularia ovulum, Lamk. ; Blainv. Diet. Sc. Nat. lx. 193. 
F. tarentina, Lamk. 
E. angulosa, Deslong champs . 
a, b, c, d. A series. Kent. 
e,f. Fibularia pusilla.'^^ Berwick on Tweed. Presented 
by G. Johnston, M.D. 
g, h. With spine, green. Arran. Rev. D. Landsborough. 
Earn. 4. Spatangid^. 
Spatangidae, Gray, Ann. Phil. x. 1825, 9. 
Spatangi, Agassiz, Ann. Nat. Hist. i. 300, 1838. 
Spatangus and Anachitis, Lamk. Syst. i. 347. 
Echinides excentrostomes, Blainv. Diet. Sc. Nat. lx. 185, 1830. 
1. Spatangus. 
Spatangus, Klein ; Agassiz and Desor, Ann. Sc. Nat. 1847 ; Gray, 
Ann. Phil. x. 1825, 8; Agassiz, Ann. Nat. Hist. i. 301 (1838). 
Spatangus b, Fleming, Brit. An. 481. 
Spatangus c, Blainv. Diet. Sc. Nat. lx. 185. 
Echinospatangus, Breyn. 
