NO. 3 deichmann: holothurioidea; parti, dendrochirota 77 



7. Feet occur in interambulacra but chiefly in the ventral ones. 

 (Thyones. 1.) 9 



8. Dorsal feet normally developed, soft, retractile. Spicules plates 



or buttons, often reduced. 1. Cuciunnria Blainville (pnrihn) p. 77 



8. Dorsal feet mostly papilliform. Spicules few or numerous. . 10 



9. Dorsal interradial feet few, small, easily overlooked ; radial 

 feet numerous. Resembles Pentamera. 

 4. A pentamera, new genus p. 91 



9. Dorsal feet partly large, wartlike or papilliform. Spicules 



crowded 6. Pentacta Gold fuss p. 96 



10. Spicules numerous, forming a crowded layer 11 



10. Spicules more or less reduced, scattered, or lacking 14 



11. Spicules as 2- or 4-pillared tables. Calcareous ring with long 

 posterior prolongations 8. Thy one Oken p. 102 



11. Spicules as knobbed buttons 12 



12. Feet at first comparatively few, in distinct rows along the am- 

 bulacra, later crowded in the interambulacra, mostly papilli- 

 form 7. Thyonacta, new genus p. 101 



12. Feet numerous, but in almost indistinct rows along the am- 

 bulacra 13 



13. No external plates covei'ed by reticulum. Either baskets or 

 buttons with spinous handle. . 9. Neothyone, new genus p. 108 



13. External plates covered by a reticulum 



10. Pachythyone, new genus p. 114 



14. Spicules swollen buttons, often obviously derived from tables. 

 Calcareous ring with long, well-developed posterior prolonga- 

 tions 11. AthyonCj new genus p. 118 



14. Spicules apparently lacking except the end plate in the feet. 

 Calcareous ring with short posterior prolongations sometimes 

 reduced 12. Anaperus Troschel p. 120 



Genus 1. CUCUMARIA Blainville 



Diagnosis. — Dendrochirotes with 10 tentacles, of equal size or the 

 ventral ones smaller. Feet large, soft, in 5 bands, in some forms also scat- 

 tered in the interradii, particularly dorsally. Calcareous ring low, simple. 



