PLATE IV. 



FIG. 



1. NOTAMIA BURSARIA, p. 100. 



2. - , front of the zoarium. 



3. - , dorsal surface. 



4. , nat. size. 



5. , avicularia, showing the differences of 



size. 



5 a . , avicularium, showing the arrangement 



of the muscles for opening and closing the man- 

 dible. After Busk. 



6, 7. BRETTIA PELLUCIDA, p. 28. After Busk. 

 8, 9. BEANIA MIRABILIS, p. 96. 

 10. > a young cell. 



