ECHINOIDEA. I. 9I 



Fam. Toxopneustidæ. Pores multigeminate; the test rouiid or pentagonal. 

 Fam. Echinometradæ. Pores multigeminate; the test elliptical. 



Agassiz (Revision of Echini). 



Fam. Echinometradæ. Pores multigeminate — Coloboccntrofus, Hctcrocentrotus, Echinometra, 

 Parasalcnia, Stomopncnstcs, S/ron^yloccnirofus [Snhgen. Sphærechhms^ PseMdoboletia\ Echino- 

 strefJuis. 

 Fam. Echinidæ. Pores trigeminate. (Subfam. Temuopleuridæ.) 



Subfam. Triplechinidæ. Phymosoiiia, He^nipedina^ Echimis, Toxopneustes ^ Hipponoi\ 

 Evcchiniis. 

 Bell (40). 



Fam. Echinidæ. 



Group I. Test round. Echininæ. 



a) The ambulacral piates formed of three primary piates. Echiniis etc. 

 l3) — -- — — - four or more primary piates. Strongyloccn- 



trotiis etc. 

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

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



t r o t i n æ. 

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



Les Echinométriens. Coloboccntrotus, Podophora, Hctcroccntrotiis, Acrocladia, Echinomrtra, 



Ellipsechiniis^ Parasalein'a. 

 Les Héliocidariens. Strongyloccntrotus, Toxocidaris (= Anthocidaris'Ltk.), Loxcchinus, Echhio- 



shrp/iiis, Stomopncitstes^ Heliocidaris {= Evechinus), Holopneustes. 

 Les S c h i z e c h i n i e n s. Toxopnmstes (= Bolctid), Psctcdoboletia, Hipponoi\ Sphærcchiinis, A 11 a- 



pcsiis (= Lytcchimts Ag., Psilcchitms Ltk., Schizcchinus Pomel). 

 Les Psamm echini ens. Echinus^ Psammechinus [miliaris etc), Arbacina (forbcsiana). 

 Duncan (132). 



Fam. E c h i n o m e t r i d æ. 



Subfam. Echinometrinæ. Heteroccntrotus, Coloboccntrofits^ Echinomctra, Stomopneiistcs^ 



Parasalein'a. 

 Subfam. Polyporinæ. Strongyloccnfrotiis, Sphærcchinus, Echiiwstrcphus, Pseudobolctia. 

 Fam. Echinidæ. Echiims i^v^i'g&w. Psammechinus), Toxopnmstes, Boletia, Tripneiistes (Subgen. 

 Evechiiiiis). 



I. W. Gregory'). 



F'am. Triplechinidæ. Echinus, Psammechinus, Tripncustes[= Hipponoé), Toxopneustes, Bolctia, 



Evcchimts. 

 Fam. Strongylocen trotid æ. Strongyloccntrotus, Spluercchimis, Pseudoboletia. 

 Fam. E c h i n o m e t r i d æ. Echinometra, Stomopncustes, Heterocentrohis, Colobocentrohis, Parasalenia. 



I) Echinoidea, in cA treatise 011 Zoology, edited by E. Ray Lankester . Part. III. Echinoderma. London. 1900. 



12* 



