OEMMILL. TWIN GASTRUL^ 

 AND BIPINNARI^ OF LUIDIA. 



PLATE II 



pr. ciLbd. 

 b. cav. 



b.cav. 



o.cil.bd. 



Fig. 13. 



Fig. 12. 



po.cil.bd 



!)lom, 

 3r. cil.bd. 



)r.Gil.bd 



b/cav^. 



[587] 



