PLATE 3. 



Figs. 30 to 34. — Ascidia clrmenica. 



Fig. 30. A fragment of tlic branciiial 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 memlirane with two of the large trans- 

 verse vessels. 



Figs. 35 to 38. — Ciona niollis. 

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

 Fig. 36. Hypophyseal region with (Uirsal 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 Psammaprtdiiim Spauldingi, X 20. 



Figs. 40 and 41. — Didemnum opacum. 

 Fig. 40. The colony X 1. 

 Fiff. 41. A liranchial sac much enlarged. 



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