PLATE 4. 



Amphicaryon acaule. 



Fig. 1. Lateral view of entire colony, showing relationship of the older nectophore (N.A) to the 

 younger one (N.P). X 10. 



Fig. 2. Apical view of same, showing the relative sizes of the two nectosacs (Ns.A and Ns.P). 



Fig. 3. Central portion of the colony, showing the short corm with its appendages, and the 

 canal system of the two nectosacs. The bract-hke older nectophore (N.A) is turned to one side to 

 expose the hydroecial furrow, with the stem, and the muscular lamellae bearing the nectophores. X 15. 



Fig. 4. Dorsal view of the nectosac of the older nectophore. X 40. 



Fig. 5. Bract and female gonophore. X 50. 



Fig. 0. A group of appendages: siphon, bract, tentacle, and female gonophore. X 25. 



Fig. 7. Ventral view of bract. 



Fig. S. A very young colony, 3 mm. long, showing how the relatively large older nectophore (n.a) 

 overlaps the younger one (N.P). 



