PLATE 3. 



Figs. 30 to 34. Afse-iflia elemental. 



Fig. 30. A fragment of the branchial network. 

 Fig. 31. The whole animal, X -. 



Fig. 32. The animal removed from the test, showing intestinal tract, re- 

 productive organs and "kidney." 



Fig. 33. Hypophyseal complex, dorsal lamina, and tentacular circlet seen 

 from within. 



Fig. 34. Small piece of branchial membrane with two of the large trans- 

 verse vessels. 



Figs. 35 to 38. dona mollis. 

 Fig. 35. The animal removed from the test, X "2. 



Fig. 36. Hypophyseal region with dorsal languets and a portion of the 

 tentacular circlet. 



Fig. 37. A single tentacle. 



Fig. 38. Portion of the branchial membrane, inner surface. 



Fig. 39. A zooid of Psammaplidium Spauldingi, X -0. 



Figs. 40 and 41. Dideiniunn opacum. 



Fig. 40. The colony X 1. 



Fig. 41. A branchial sac much enlarged. 



[52] 



