284 



Miliary granules not stellate plates 8 



8. Miliary granules "buttons" eximia 



Miliary granules not "buttons", but rods of different shape 9 



9. Radial pieces of calcareous ring ovoid bodies without any passage for 



the nerves gigas 



Radial pieces of calcareous ring not ovoid bodies. Passage for nerves 

 present as holes or notches in anterior margin 10 



10. Rods confined to ambulacra 11 



Rods not confined to ambulacra 12 



11. Rods larger than wheel-diameter and nearly straight. Ciliated fun- 

 nels of two different sorts stuhlmanni 



Rods smaller than wheel-diameter, usually distinctly curved. Ciliated 

 funnels of only one sort regalis 



12. Wheel-papillae irregularly scattered all over interradii 13 



Wheel-papillae more or less regularly arranged in a single row in 



the middle of the interradii, often nearly quite wanting ventrally. .. 17 



13. Mid-ventral radial perforated for the nerve 14 



Mid-ventral radial notched in anterior margin for the passage of the 

 nerve. . 16 



14. Colour yellow, miliary granules all more or less C-shaped with rounded 

 ends. The smaller ones make a dense layer in the skin, and the larger 

 ones are arranged into groups in posterior end of body . . . aponocrita 

 Colour red or reddish. Rods not all C-shaped and not in a dense 

 layer in the skin 15 



15. Rods not distinctly C-shaped. Their ends are not spiny but weakly 



branched rigida 



Rods of two sorts : C-shaped and nearly straight with spiny ends amboinensis 



16. Colour yellow or whitish, viviparous, West-Indian rotifera 



Colour reddish or brownish, as far as known not viviparous; Hawaiian 

 species hawaiiensis 



17. Some of, or all the radiais notched in the anterior margin... liberata 

 Radiais perforated for the passage of the nerve 18 



18. Colour dark purple or brownish 19 



Colour yellow 22 



19. Rods small, usually crescent-shaped and forming a dense layer in 



the skin 20 



Rods larger, not distinctly crescent-shaped and not forming a dense 

 layer in the skin. Ciliated funnels small and scattered on the mesentery 21 



20. Rods of very nearly the same shape and size, the ends irregularly 



branched. Size small nanaimensis 



Rods of varying size and shape, the largest crescent-shaped with 

 three or four dentate ends, the smaller more oval bodies. Size large. 

 Ciliated funnels united into stalked clusters placed on the body-wall violacea 



21. Rods in tentacles very large, those of body nearly totally confined 



to the dorsal side of anterior end of body pacifica 



