Hekcuman'. — Nervous System of Limax. 



PLATE VII. 



All the figures of this plate, except Fig. 95, were made from material killed in 

 0.33% chromic acid, and stained in alcoliolic borax-carmine. All figures are 

 magnified 250 diameters. 



Figs. 81-82. (See explanation of Figs. 48, 49, Plate III.) 



" 81. The 114th section of the series; it shows the right cerebral and pedal 

 ganglia, together with the cerebro-pedal connective, the right buccal 

 ganglion, and the abdominal ganglion. 



" 82. The 126th section of the series. It passes through a portion of the right 

 cerebral ganglion, the right pleural and the abdominal ganglia, from 

 the last of wiiich a nerve runs dorsalward. 



" 83, 84. The left surface of two sections (the 96th and 99th) parallel to the 

 sagittal plane from an embryo of the twelfth day. 



" 83. The section shows a very small portion of the cerebral ganglion, the 

 pleural and visceral ganglia of the right side in the region of the 

 pleuro-visceral connective, and the abdominal ganglion together with 

 its connective with the right visceral ganglion. 



" 84 shows the right visceral and the abdominal ganglia ; also, a portion of the 

 connective between the abdominal and the visceral ganglia, and a large 

 nerve extending dorsalward from the latter. 



" 85-94. (See explanation of Figs. 50, 52, Plate III.) Transverse sections, 

 twelfth day. 



" 85. This section (113th) shows a portion of the abdominal ganglion sepa- 

 rated from the ectoderm. 



" 86 (117th section) shows a small portion of the abdominal ganglion, as 

 well as the pleural and visceral ganglia of the right side, together 

 with their connective. 



" 87. (126th section ; compare also r25th section. Fig. 88.) A portion of the 

 right visceral ganglion and the large nerve running dorsalward from 

 its left dorsal margin are shown. 



" 88 (125th section) shows both visceral ganglia — the left one still con- 

 nected with the ectoderm — and the left pleural ganglion, together 

 with the pleuro-visceral connective. 



" 89. The r28th section, which touches the right visceral ganglion, and a large 

 nerve running dorsalward between mantle cavity and sexual duct 

 from the right dorsal margin of the ganglion. 



" 90. The 77th section; it pauses through both pedal ganglia and their poste- 

 rior commissure, which is directly above the blind end of the pedal 

 gland, the tip of which is cut. 



" 91. The 103d section, which shows the right pedal ganglion and otocyst. 



" 92. The 101st section, which passes through the pedal ganglia and their an- 

 terior commissure, above which is the ra^ula sac, and below which a 

 blood-vessel and the pedal gland are to be seen. 



(See obverse ) 



