109 



LÜTKEN*) places the genera Amblypneiistes and Holopneiistes in a separate 

 group, Amblypneiistidæ. They are certainly nearly related, but there is no reason 

 to separate them from the family of the Temnopleiiridœ , whose most specialized 

 members they are. 



Analytical table of the species of Microeyphius, Amblypneustes, 

 Holopneustes and Goniopneustes. 



1. A primary tubercle found on all the ambu- 

 lacral plates; the pores arranged in regular 

 arcs of three 2. 



A primary tubercle found only on every 

 second or third ambulacral plate, or even 

 more irregularly 9. 



2. The median space of both areas bare and 

 smooth (Microcyphus) 3. 



No distinct bare median space, the tu- 

 bercles reaching to the median line of the 

 areas (Amblypneustes) 6. 



3. The test low; the median naked spaces very 

 large. The spines rather stout, green. Globi- 



ferous pedicellariæ without lateral teeth . . . Microcyphus maculatus Agass. 



The test high. Globiferous pedicellariæ 

 with or without an unpaired lateral tooth; 

 spines not green 4. 



4. Spines red-banded; the test elongate (always?) Microcyphus anniilalus Mrtsn. 



Spines not banded; the test eggshaped . . 5. 



5. The naked spaces narrow, dark brown co- 

 loured, standing very prominently against 

 the faint red colour of the other part of the 



test. Spines intensely red Microcyphus zigzag Agass. 



The whole test of a uniform beautiful 



red colour; spines faintly reddish Microcyphus elegans Mrlsn. 



6. Test high, eggshaped 7. 



Test somewhat depressed, sphæroidal; 



spines clubshaped Amblypneustes griseus (Blv.). 



7. Primary spines clubshaped, green, faint lo- 

 zenge-shaped figures on the test. Ophice- 



phalous pedicellariæ not very elongate Amblypneustes pallidus (Lmk.). 



Primary spines not clubshaped 8. 



'J Bidrag til Kundslsab om Echiniderne. p. 84. 



