208 



Outline of rods in digits very seldom smooth, usually distinctly un- 

 dulating or with large knobs 14 



12. Rods in digits with enlarged and perforated ends variopatina 



Ends of digital rods not distinctly enlarged and never perforated.... 13 



13. Rods in digits curved and branched (Fig. 39. 1) and distinctly different 

 from those in tentacle-stem. Anchor-plates usually irregularly formed 

 with a varying number of additional holes in anterior end . irregularis 

 Rods in digits not so distinctly curved and branched (Fig. 35. 9) and 

 not different from those in tentacle-stem. Anchor-plate's often more 



or less reduced in the articular end; additional holes not found reducia 



14. Rods in digits distinctly undulating, often with large knobs. Rods in 



tentacle-stem nearly smooth dolabrifera 



Rods in digits and tentacle-stem alike, all with more or less undulating 

 outline 15 



15. Outline of rods undulating, often nearly smooth. Ends not perforated. 



(Red Sea) che ] a 



Outline of rods with large knobs. Ends usually perforated. (Port 

 Jackson) jacksonia 



16. Pacific species 17 



Atlantic species 20 



17. Rods wanting in body-wall, minute granules often present 18 



Rods present in body-wall, minute granules wanting 19 



18. Tentacle-rods wanting, minute granules present lens 



Tentacle-rods present albicans 



19. Beside the common rods, large curved rods are present in the inter- 

 ambulacra. Anchor-arms short (Fig. 31. 1-5) clarki 



No large curved rods in interambulacra. Anchor-arms long and slender 

 (Fig. 33. 1) roxtona 



20. Miliary granules wanting. Anchor-plates more or less rounded, with 



smooth holes circopatina 



Miliary granules present. Anchor-plates more or less oblong with 

 dented holes 21 



21. Tentacle-rods wanting crassipatina 



Tentacle-rods present 22 



22. Anchors small 80 — 120 ^, tentacle-rods short and wide, usually ir- 

 regularly perforated (Fig. 30. 9-10) micropatina 



Anchors larger 140—200 Tentacle-rods long and slender and not 

 perforated (Fig. 29. 2 & 4) tenuis 



Leptosynapta tenuis (Ayres). 



Synapta tenuis. Ayres. 1851. Notices on Holothuridae. Proc. Bost. 

 Soc. Nat. Hist. vol. IV, pag. 11. 



— ayressii. Selenka. 1867. Beiträge zur Anatomie und Syste- 



matik der Holothurien, pag. 362. 



— gracilis. Selenka. 1867. Op. cit., pag. 363, Pl. XX fig. 123—124. 



