BIHANG 



TILL K. SV. VET.-AKAB. HANDL. BAND 13. AFI). IV. N:0 10. ^ 



Discoidea cjlindrica Ag. 



Fig. 1. The peristome from the inside. 



Fig. 2. Four auricles, from the Fig. 3. Section made a little obliquely so 



aboral side, an ambulacral pair as to pass through one of the interradial 



in the middle. ridges, the lateral part of the peristomal 



ambulacrum. and the auricle. 



