DESCRIPTION OF PLATES. 505 



16. Notonecta glauca. An insect of the order Hemiptera. 



17. Myrmeleon formicarium. An insect of the order Neuroptera. 



18. Mutilla Europaea. An insect of the order Hymenoptera. 



19. Vespa vulgaris. The Wasp. 



20. Apis mellifica. The Honey-Bee. 



21. Papilio Machaon. An insect of the order Lepidoptera. 



22. Bombyx pavonia minor. An example of a nocturnal Le- 



pidopterous insect. 



23. Bombylius medius. An insect of the order Diptera. 



24. CEstrus equi, male and female. 



25. Musca carnaria. 



PLATE VIII. ECHINODERMATA, POLYPI, &c. 



Fig. 1. Echinus esculentus, an exemplification with the follow- 

 ing figure of the Echinodermata. 



2. Ophiura lacertosa. 



3. Zoanthus Ellisii. 



4. Corallina officinalis a, a portion magnified to show the 



form of the cells. 



5. Corallina squamata. b, a portion magnified. 



6. Corallina rubens. c, a portion magnified. 

 7- Isis hippuris, without the soft crust. 



8. Ditto, with the soft covering. 



9. Corallium rubrum. d, a portion magnified to show the ra- 



diated tentacula of the polypus. 



10. Meandrina labyrinthica. 



11. Tubipora musica. 



12. Sertularia cupressina. e, a magnified portion. 



13. Flustra carbasea. -f, a magnified portion,, displaying the 



form of the cells. 



14. Sertularia pumila. g } a portion magnified. 



15. Tubularia ramosa. h, a small portion magnified. 



