EXPLANATION OF PLATES. 395 



PLATE LV. 

 SALPA SCUTIGERA-CONFKDERATA, Chain Form. 



Figure 1, a longitudinal, vertical section of the ganglion, eye and ciliated funnel. 

 81.1 diameters. 



Figure 2, a longitudinal, vertical section of the ganglion and eye. X 180 diameters. 



Figures 3-5, transverse sections of the ganglion and adjacent parts, showing the 

 larger eye, the smaller masses of rod cells (y), the ventro-lateral outgrowths from 

 the ganglion (6'), and portions of the subneural gland (h and d). Fig. 5 represents 

 the more anterior section. Fig. 3 X 98 diameters ; Figs. 4 and 5 x 180 diameters. 



SALPA BICAUDATA, Chain Form. 



Figure 6, a transverse section of the two lobes of the eye. X 180 diameters. 



Figure 7, a longitudinal, vertical section of the ganglion and eye. X 180 diameters. 



Figures 8 and 9, transverse sections of the ganglion and adjacent parts, showing 

 the subneural gland (h) and the ventro-lateral outgrowths from the ganglion (6'). 

 X 180 diameters. 



SALPA DEMOCRATICA-MUCRONATA, Solitary Form. 



Figure 10, a longitudinal, vertical section of the ganglion and eye, showing also 

 one of the disk-like portions of the subneural gland, h. X 240 diameters. 



Figures 11 and 12, transverse sections of the ganglion and eye. Fig. 11 cuts the 

 posterior part of the eye ; Fig. 12 the two anterior limbs. X 240 diameters. 



Chain Form. 



Figure 13, a longitudinal, vertical section of the ganglion, eye and ciliated funnel. 

 X 98 diameters. 



Figures 14 and 15, longitudinal, vertical sections of the ganglion and eye. X 300 

 diameters. 



PLATE LVI. 



Figure 1, a postero-dorsal view of the ganglion and eye of Salpa bicaudata, chain 

 form. X 58i diameters. 



Figure 2, a dorsal view of the ganglion and eye of Salpa costata-Tillesii, chain 

 form. X 24i diameters. 



Figure 3, a dorsal view of the eye, ciliated funnel, ganglion and nerves of Salpa 

 cordiformis-zonaria, chain form. X 52 diameters. 



Figure 4, a dorsal view of the ganglion, eye and ciliated funnel of Salpa cylin- 

 drica, chain form. X 173 diameters. 



Figure 5, a dorsal view of the eye, ganglion, some of the nerves and a portion of 

 the ciliated funnel of Salpa cordiformis-zonaria, solitary form, x 70 diameters. 



Figure 6, a dorsal view of the ganglion, eye, and a portion of the ciliated funnel 

 of Salpa runcinata-fusiformis, chain form. The ganglion and eye are twisted so that 

 the view is somewhat from the left side and not strictly dorsal. X 173 diameters. 



Figure 7, a dorsal view of the eye, ganglion, nerves and ciliated funnel of Salpa 

 scutigera-confederata, solitary form, x 60 diameters. 



PLATE LVII. 



Figure 1, a longitudinal, vertical section of the ganglion and adjacent parts of a 

 young embryo (solitary form) of Salpa hexagona, showing the peculiar fold of ecto- 

 derm back of the ganglion. X 215 diameters. In this figure the letters al should 

 read dl. 



