113 



Paradoxechiniis Laube, Coptophyma Per. & Gauth. and Lepidopleurus Dune. & Sladen 

 may really belong to this subfamily. 



The natural arrangement of the genera of Temnopleurids then seems to be 

 as follows: 



Fam. Temnopleuridce. 



Subfam. Temnechinince. No pits; mostly raised ornamentation on the plates 

 or low suturai depressions. Plates not united by dowelling: 

 Genera : Hypsiechinus Mrtsn., Prionechinus A. Ag., Genocidaris A. Ag., Tri- 

 gonocidaris A. Ag., Tenmechiniis Forb., Opechinus Desor, Ortho- 

 lophiis Dune, Paradoxechiniis Laube, Coptophyma Per. & Gauth., 

 Lepidopleurus Dune. & Sladen. 

 Subfam. Temnopleurinœ. True pits; the plates united by dowelling, mostly 

 with smooth surface. 

 Genera: Temnopleurus Agass., Pleurechimis Agass., Salmacis Agass., Salma- 

 copsis üöderl., Mespilia Agass., Microcyphus Agass., Amhlypneiistes 

 Agass., Goniopneustes Dune., Holopneustes Agass. 



Fam. Toxopneustidae. 



Subfam. Schizechininæ. 

 14. Gymnechinus pulchellus n. sp. 



PI. I. Figs. l(i, 23. PI. II. Fig. 11. PI. VII. Figs. 8, 29, 3G, 41, 46. 



The test is very low, both sides flat, or (in the larger specimens) the abac- 

 tinal side gently rising towards the apical system; it is a little pentagonal, the 

 ambulacra raising somewhat above the interambulacra at the ambitus. The mouth 

 edge is a little inwardly curved. A few measurements may be given here. 



') The largest specimen. 



Ambulacra rather broad, though distinctly narrower than the interambu- 

 lacra; also at the peristome they are distinctly narrower than the latter. The pores 



1) K, I) ViUensk, Selsk. Skr,. 7, Rïekke, naturvidensk. og mathem. Atil. I, I. 



15 



