ECHINOIDEA. I. 91 



Fain. Toxopneustidse. Pores multigeminate; the test round or pentagonal. 

 Fam. Echinometradse. Pores multigeminate; the test elliptical. 



Agassiz (Revision of Echini). 



Fam. Echinometradae. Pores multigeminate — Colobocentrotus, Heterocentrotus, Echinometra, 

 Parasalenia, Stomopneustes, Strongylocentrotus (Subgen. Sphcerechinus, Pseudoboletia), Echino- 

 strephus. 



Fam. Echinidse. Pores trigeminate. (Subfam. Temnopleuridse.) 



Subfam. Triplechinidae. Phymosoma, Hemipedina, Echinus, Toxopneustes ■, Hipponoe, 

 Evechinus. 

 Bell (40). 



Fam. Echinidse. 



Group I. Test round. Echininse. 



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

 R\ — — - four or more primary plates. Strongylocen- 



trotus etc. 

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

 — HI. — _ — at right angles to the longitudinal axis. Heterocen- 



t r o t i n se. 

 Pomel (324). (In this account of the system of Pom el the fossil genera are omitted). 



Les Echinometrieus. Coloboccntrotus, Podophora, Heterocentrotus , Acrocladia, Echinometra, 



Ellips echinus, Parasalenia. 

 Les Heliocidariens. Strongylocentrotus, Toxocidaris (= AntkocidarisUk.), Loxechinus, Echino- 



strephus, Stomopneustes, Heliocidaris (= Evechinus), Holopneustes. 

 Les Schizechiniens. Toxopneustes (= Bolctia), Pscudobolctia, Hipponoe, Sphcerechinus, Ana- 



pes/ts (= Lytechinus Ag, Psilechinus Ltk., Schizeckinus Pomel). 

 Les Psamm echini ens. Echinus, Psammechinus [miliaris etc.), Arbacina (forbcsiai/a i. 

 Duncan (132). 



Fam. Echinometridse. 



Subfam. Echiuometriuoe. Heterocentrohts, Colobocentrotus, Echinometra, Stomopneustes, 



Parasalenia. 

 Subfam. Pol ypo rinse. Strongylocentrotus, Sphcerechinus, Echinostrephus, Pscudobolctia. 

 Fam. Echini da. Echinus (Subgen. Psammechinus), Toxopneustes, Bolctia, Trip// castes (Subgen. 

 Evechinus). 



I. W. Gregory 1 ). 



Fam. Tripleehinidse. Echinus, Psammechinus, Tripncustes (= Hipponoe), Toxopneustes, Bolctia, 



Evechinus. 



Fam. S t r o n o- y 1 o c e n t r o t i d se. Strongylocentrotus, Sphcerechinus, Pseudoboletia. 



Fam. Echinom etrid se. Echinometra, Stomopneustes, Heterocentrotus, Coloboccntrotus, Parasalenia. 



■) Echinoidea, in A treatise on Zoology, edited by E. Ray Lankester . Tart. III. Echinodenna. London. 1900. 



