ECHINOIDEA. I. qj 



Fam. Toxopneustidte. Pores multij^^einiiiate; the test round or pentagonal. 

 Fam. Echinometradte. Pores multigeminate; the test eUiptical. 



Agassiz (Revision of Echini). 



Fam. p;chinoiuetrad:e. Pores multigeniinate — ColoboccntroUis, ITcterocentrohis, Echinomeira, 

 Pamsalniia, Sfomopneustcs, Sfroi/gylocriifrofiis[S\ihg&\\. Sph(ercchinus^ Pseudoboletid), Echino- 

 strephus. 

 Fam. Echinidte. Pores trigeminate. (Subfam. Temnopleuridae.) 



Subfam. Tripl echini dse. PliyDwsoiiia, Hemipediiia, Echimts, Toxopncustes , Hipponoe\ 

 EvccliiuKs. 

 Bell (40). 



Fam. E c h i n i d £e. 



Group I. Test round. E c h i n i n £e. 



a) The ambulacral plates formed of three primary plate.s. Echinus etc. 

 /?) — — — — - four or more primary plates. Strongylocen- 



trotiis etc. 

 Group II. The morphological axis obliquely to the longitudinal axis. Echinometrinse. 

 — III. — — — at right angles to the longitudinal axis. Heterocen- 



t r o t i n £e. 

 Pom el (324). (In this account of the system of Pom el the fos.sil genera are omitted). 



Les Echinometriens. Coloboccntrotjis^ Pndopliora^ Ilcterocciitrotits^ Acrocladia^ Eckinomcfra, 



Ellipscchimis^ Parasalcin'a. 

 Les H e 1 i o c i d a r i e n s. Sfroiigyloccnfrofus, Toxocidaris ( = A nthocidaris Ltk.), Loxcchiiius, Ecliino- 



sfrrphns, Sfoiiiopiinistes, Heliocidaris (= Evechmits)^ Holopncustcs. 

 Ees Schiz echini ens. Toxopncustcs [= Bolctia\ Pscudoboletia^ Hipponoe\ Sphmrcchinus^ A)ia- 



prsus (= Lytrcliiints Ag., Psilcchinns Ltk., Schizrchiiius Pomel). 

 Les Psa mm ech i niens. Echinus^ Psainiiicchiiius [iiiiliaris etc.), Arbaciiia (forbrsiana). 

 Duncan (132). 



Fam. E c h i n o m e t r i d se. 



Subfam. Echinometrinse. Hcfcrocn/frohis, Coloboccufrofus, Echiiwmcfra, Sfo?nopnncstcs, 



Parasalaiia. 

 Subfam. PoH-porinse. Strongyloceiitrotus^ SpkcrrccJnnus, Eckhmstrephus, Pseiidoboletia. 

 Fam. EchinidiE. Ec/n'iius [^whg&n. Psaijn>irc/iiiiiis\ ToxopncHstes, Boletia^ Tripneusfes {Suhgen, 

 E.vechinus). 



I. W. Gregory'). 



F'am. TriplechinidcC. Echinus, Psamiiicchinus, Tripncusfrs [= Hipponoc\ Toxopncusles, Bolefia, 



Evcchiinis. 

 Fam. S t r o n g }■ 1 o c e n t r o t i d ae. Strougyloccntrotits^ Sphcerechimis, Pseudoboleiia. 

 Fam. E ch i n o m e t r i d te. Echiiionictra, Stoiiiopncusfes, Hefcrocentrotus, Colobocentrotus, Parasalcnia. 



') Echiiioidea, in lA treatise on Zoology, edited by E. Ray Laukester . Part. III. Echiuoderma. London. 1900. 



