436 Proceedings of the Royal Physical Society. 



Brissopsis, . 



lyrifera, 

 Brissus — 



fragilis, 



lyrifer^ 

 Calveria, 



fenestrata, 



hystrix, 

 Cassidulid^, 



ClDARTDJE, 



Cidaris, 



affinis, . 



borealis, 



hystrix, 



papillata, 



purpurata, 



CiDAROIDA, 



Clypeastroida, 



DiADEMATOIDA, 



Dorocidaris, 



papillata, 

 Echinarachnius — 



placenta, 



ECHINID^, . 



Echinocardium, 

 cordatum, 

 flayescens, 

 pennatifiduiii 

 pusillus, 



Ecliinoc3'amiis, 

 pusillus, 



EcMnometra — 

 drohachensis, 



EOHINOMETRID^, 

 ECHINOTHURIID^, 



Echinus, 

 acutus, . 

 cordatus, 

 drobachiensis 

 elegans, 

 esculentus, 

 csculentiis, 

 Jiemingii, 

 granularis, 

 lacunosus, 

 lithophagus, 

 lividus, 

 nielo, 

 microstoma, 



Pag-e 

 422 

 422 



422 

 422 

 407 

 408 

 407 

 420 

 403 

 403 

 404 

 404 

 404 

 404 

 405 

 403 

 418 

 405 

 403 

 404 



420 

 411 



426 

 427 



428 

 428 

 427 

 418 

 419 



409 

 408 

 • 405 

 411 

 413 

 427 

 408 



400, 414 

 411 

 410 



400, 413 

 410 

 424 

 410 

 410 



400, 414 

 415 



