1894.] MICROSCOPICAL JOURNAL. 383 



14. STAUROLONCHE. 



Pores circular, 4-5 on the quadrant ; surface smooth aperta. 



Pores circular, 20-22 on the quadrant ; surface spiny feuerbachii. 



15. STAUROLONCHIDIUM. 



Pores circular, 3-4 on the quadrant perspicuum. 



16. STAURACONTIUM. 



Pores circular, 16-18 on the quadrant sparganium. 



17. HEXALONCHE. 



Pores circular, hexagonally framed, 6--8 on the radius favosa. 



18. HEXACONTIUM. 



Pores irregular, roundish, 5-- 7 on the radius setosum. 



19. ACANTHOSPH^RA. 



Pores circular, twice as broad as the bars; 30--40 radial spines compacta. 



Pores irregular, roundish, 7—9 on the radius, 10--20 radial spines ..acanthica. 



20. HALIOMMA. 



Pores circular, 8--10 on the radius ; commonly spines at all the nodal 

 points .', horridum. 



Pores circular, 6—8 on the radius; spines not at all the nodal points, .oculatum. 



Pores irregular, roundish, about 20 ou the radius ; commonly spines at all 

 the nodal points rhodococcus. 



21. ACTINOMMA. 



Pores irregular, roundish; diameter of shell 0—4 giganteum. 



22. ECHINOMJIA. 



Pores circular, 8— 10 on the radius aculeatum. 



23. CENELLIPSIS. 



Pores circular, 8-9 on the half-equator ehrenbergii. 



24. ELLIPSIDIUM. 



Meshes hexagonal, 18—20 on the half-equator pandanidium. 



25. ELLIPSOXIPHUS. 



Meshes hexagonal, 8-9 on the half equator flosculus. 



26. ELLIPSOSTYLUS. 



Meshes irregular, roundish, 8-10 on the half-equator hirundo. 



27. LITHOMESPILUS. 



Pores irregular, roundish, 10-12 on the half-equator £ammens. 



