PLATE XXX. 



Figs. 24 and 25. Distoma pulchra. 



24. Several bunches. Natural size. 



25. Thorax of immature zooid. The specimen was dissected from the test 

 and cut lengthwise nearly in the sagittal plane. The figure represents 

 the left side. The cut passed to the left of the endostvle and to the right 

 of the dorsal languets. 



Figs. 29 and 30. Amaroiict'urn translticidum. 



29. Slightly less than natural^ size. Usually more masses than are here 

 shown are joined together. 



30. Zooid much enlarged. 

 Figs. 33 to 37. Botryllus magnus. 



33. Part of a colony. Natural size. 



34. A few of the systems. 



35. Outline of adult zooid. (X 16.) 



36. Young zooid. Atrial languet not yet developed. 



37. Piece from the margin of a colony, showing the ectodermal vessels with 

 their ampulla. 



(266) 



