PLATE 41 

 Figs. 24-27, Ascidia californica. 

 Fig. 24. Animal viewed from left side, test removed. Natural size. 

 Fig. 2.5. A portion of tentacular circlet and hypophyseal region seen from 

 within. 



Fig. 26. Stomach and intestine viewed from right side to show ramifications 

 of ovary and testis. 



Fig. 27. Two lobes of atrial siphon showing the bordering teeth and pig- 

 ment spots. 



Figs. 28-34, Styela montereyensis. 



Pig. 28. Animal, with test removed, viewed from the right side, showing 

 position of the reproductive organs. Natural size. 



Fig. 29. Same viewed from left side. 



Fig. 30. A portion of the tentacular circlet and hypophyseal region seen 

 from within. 



Fig. 31. Anterior portion of ovary, viewed from the inner surface. 



Fig. 32. Atrial siphon cut so as to expose part of velum with atrial branches. 



Fig. 33. Spinule 



Fig. 34. Spinule. 



Fig. 3.5. Styela yaliitateiisls. Spinule. 



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