ECHINOIDEA. I. 



9 1 



Fam. Toxopneustidae. Pores multigeminate; the test round or pentagonal. 

 Fam. Echinometradse. Pores multigeminate; the test elliptical. 



Agassi z (Revision of Echini). 



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

 Parasalenia, Stomopneustcs,Strongyloccntrotus(^>vk> i g.T\. Sph&rcchinus, Pseudoboletia}, Echino- 

 strcphiis. 

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



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



Evechinus. 

 Bell (40). 



Fam. Echinidse. 



Group I. Test round. Echininae. 



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



/9) - four or more primary plates. Strongylocen- 



trotus etc. 



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

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



t r o t i n se. 

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



Les Echinometriens. Colobocentrotus , Podophora , Heterocentrotus , A crocladia , Echinometra, 



Ellipsechimis, Parasalenia. 

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



strephus, Stomopneustes, Heliocidaris (= Evechinus\ Holopneustes. 

 Les Schizechiniens. Toxopneustes (= Boletia), Pseudoboletia, Hipponoe, Sph&rcchinus, Ana- 



pesiis (= Lytcchinus Ag., Psilechinus Ltk., Schizechinus Pomel). 



Les Psammechiniens. Echinus, Psammechinus (miliaris etc.), Arbacina (forbesiana). 

 Duncan (132). 



Fam. Echinometridaa. 



Subfam. Echinometrinae. Heterocentrotus, Colobocentrotus, Echinometra, Stomopneustcs, 



Parasalenia. 



Subfam. Polyporinae. Strongylocentrotus, Spharechinus, Echinostrephus, Psetidoboletia. 

 Fam. Echinidae. Echinus (Subgen. Psammechinus}, Toxopneustes, Boletia, Tripnciistes (Subgen. 



Evechinus}. 

 I. W. Gregory 1 ). 



Fam. Triplechinidae. Echinus, Psammechinus, Tripneustcs (= Hipponoe}, Toxopncustes, Bolctia, 



Evechimts. 



Fam. Strongylocentrotidae. Strongylocentrotus, Sph&rcchinus, Pseiidoboletia. 

 Fam. E c h i n o m e t r i d ae. Echinometra, Stomopncustes, Heterocentrotus, Colobocentrotus, Parasalenia. 



') Echinoidea, in A treatise on Zoology, edited by E. Ray Lankester. Part. III. Echinoderma. London. 1900. 



