228 



THE AMERICAN MONTHLY [December, 



Explanation of Figukks. 



Fig. I. A small colony of Opercular ia filicatilis. | Fig. 6. An extended, and. Fig. 7, a contracted, zooid 



Fig. 2. The less common, tripartite form of the same. I of the same. 



(DiagrHm.) ! FiG. 8. Eupiotes filumipes, yentr^X a.s'pect. 



Fig. 3. A contracted, and, Fig. 4, an extended, zooid. I Fig. 9. The ornamentation of the external surface of 



Fig. 5. A small portion of a colony of EpUiylis vagi- I the carapace. 



nula. I Fig. 10. Cyclidiutn litomesum. 



