Henchman. — Nervous System of Liir.ax. 



PLATE VI. 



All the figures of ibis plate were made from material killed in Percnyi's fluid, and 

 all except Figs. 72, 73, and 77 are magnified 250 diameters. 



Figs. 70-73. Consult explanation of Figs. 32-47, Plate III. 



" 70 shows the left cerebral, pleural, and visceral ganglia in the region of the 



cerebro-pleural and pleuro-visceral connectives. 

 " 71. Section passing through the otocyst and the cerebral, pedal, and visceral 



ganglia of the left side. The visceral ganglion is connected with the 



ectoderm, and the pleuro-visceral connective is much more elongated 



than on the ninth day. 

 " 72. A portion of the ventral wall of the foot from the 32d section, to show 



the cell proliferation for the pedal ganglion. X 6(35. 

 " 73. Same as Fig. 72, but from the right side of the body. 

 " 74-70, 80\ The posterior surface of transverse sections from an individual 



of the twelfth day. The right side cut slightly in advance of the left. 



Stained in picro-carminate of lithium. 

 " 74. The 81st section, which passes through the otocysts and both pedal 



ganglia in the region of their anterior commissure. 

 " 75 and 76. The 59th and 60th sections of the same series, showing a part of 



the left side of the embryo in the region of the abdominal ganglion. 

 " 77-80. (See explanation of Fig. 68, Plate V.) Posterior faces of four suc^ 



cessive transverse sections through the mouth of the left salivary 



duct where it connects with the oesophagus. Fig. 77 shows also the 



buccal ganglia. 

 " 80\ (See explanation of Figs. 74-76.) The 107th section of the series. It 



shows the cerebral commissure, a few cells of the right cerebral 



ganglion, and the right eye. 



