PLATE VII 



Photomicrographs ( x 140) of sections of Doloria levis. 



Fixation: figs, i, 2, 3, 4 and 6 Dubosq-Brasil; fig. 5 alcohol. 



Stain: Mallory. 



Fig. I. Frontal section through brain and supraneural vessel. 

 a. antennal artery; b. supraneural ring vessel; c. valve in supraneural 

 ring vessel. 



Fig. 2. Parasagittal section through gut parenchyma leading up to 

 hepatic valve. Left side of photograph is anterior, d. gut parenchyma 

 leading to hepatic valve; e. antennal artery;/, gut musculature. 



Fig. 3. Frontal section through optic tracts and stomach ganglion. 

 g. heart; h. optic tract; k. stomach ganglion. 



Fig. 4. Oblique frontal section through base of antenna, showing 

 antennal basal ganglion and giant fibres entering muscle, m. lamina of 

 optic lobe; n. giant fibre passing from basal antennal ganglion (right) 

 to muscle (left). 



Fig. 5. Accurate sagittal section. Top of photograph is anterior, 

 o. stomach ganglion;/), oesophagus; r. stomach. 



Fig. 6. Frontal section through base of antenna, showing sphincter of 

 antennal gland, i. nucleus of nauplius eye; t. central body of brain; 

 V. sphiricter valve of antennal gland. 



