ANATOMY AND DEVELOPMENT. 



219 



Fig. 105. Metamorphosis of Ciona intestinalis ; above is represented the 

 anterior portion of the free-swimming larva from the left side ; on the left, the 

 larva, shortly after fixation, from the right side ; and on the right, the stage at 

 which the change of axis commences, from the left side. (After WlLLEY.) 



a. Atrial aperture, b. Branchial sac. ch. Notochord. e. Endostyle. f. Organ 

 of fixation, g. Ganglion, h. Neuropore (having reopened into branchial sac). 

 i. Intestine. /. Pyloric gland. m. Mouth. . Nerve-tube, oe. CEsophagus. 

 &b. Eye. of. Otocyst. /. Pericardium, s. Stomach, st. Stigmata. /. Tail. 



