Plate 13. 



Fig. 1. Thenea lamelliformis. Spirasters ; x 600. 



') 



Thetiea fenestrata O. Schm. From a photograph ; from above; \. 



3. " " " Spirasters; x 600. 



4. " " " Protriaeiie; x 100. 



5. Thenea pyriformis. From a photograph ; from the side ; \. 



6. T/tewea/eMes^rato O. Schin. Protriaeiie; x 100. 



7. " " " Dichotriaeiie, modified toward protriaene ; x 100. 



8. Thenea pyriformls. From a photograph ; from above ; \. 



9. TAewea /e?tcs<m<a 0. Schra. From a photograph ; from the side ; \. 



10. Tlienea pyriformls. Parenchymal microseleres ; x 600. 



11. " " Microseleres of dermal membrane ; x 600. 



12. Poecillitstra trieornis. Annulated microxea; x 150. 



13. " " Triaene with reduced rhabdome ; from the side; x 30. 



14. " " Microxea, nearly smooth; x 400. 



