394 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 



SALPA HEXAGONA, Chain Form. 



Figure 13, a longitudinal, vertical section of the ganglion and eye. X 157 

 diameters. 



Figure 14, a transverse section through the basal portion of the eye. 



Figure 15, a transverse section through the ganglion, showing the lateral out- 

 growths of rod-like cells. X 180 diameters. 



PLATE LIII. 

 CYCLOSALPA CHAMISSONIS, Chain Form. 



Figures 1 and 2, transverse sections through the large dorsal eye ; Fig. 1, a sec- 

 tion through the posterior region ; Fig. 2, a section through the junction of the 

 secondary smaller portion of the eye and the anterior part of the main body of the 

 eye. X 180 diameters. 



SALPA RUNCINATA-FUSIFORMIS, Solitary Form. 



Figure 3, a longitudinal, vertical section through the ganglion and one limb of 

 the eye. X 197 diameters. 



Figures 4-6, transverse sections of the ganglion and eye ; Fig. 6 representing the 

 more anterior section. X 180 diameters. 



Chain Form. 



Figure 7, a longitudinal, vertical section of the unpaired eye and the anterior 

 part of the ganglion. The smaller eye is also shown (ex). X 265 diameters. 



Figure 8, a transverse section of the basal portion of the larger eye. X 495 

 diameters. 



Figure 9, a transverse section of the ganglion through the smaller eye, ex. It 

 shows also the antero-ventral outgrowth from the ganglion, v. X 157 diameters. 



PLATE LIV. 

 SALPA AFEICANA-MAXIMA, Chain Form. 



Figure 1, a transverse section of the base of the larger eye. X 265 diameters. 



Figure 2, two depigmented pigment cells of the latter, more highly magnified. 



Figures 3-8, transverse sections of the ventral part of the ganglion and of the 

 antero-ventral outgrowth from the same. Figure 3 represents the more posterior 

 section. X 180 diameters. 



Figure 9, a transverse section of the ganglion and the subneural gland. Of the 

 lateral ducts only the right one is shown. X 180 diameters. 



SALPA COSTATA-TILLESII, Chain Form. 



Figure 10, a longitudinal vertical section of the ganglion and the large eye. 

 The smaller masses of rod cells are also shown, ex, ey. X 98 diameters. 



SALPA COKDIFORMIS-ZONARIA, Chain Form. 



Figures 11 and 12, longitudinal, vertical sections of the ganglion, eye and ciliated 

 funnel. The antero-ventral outgrowth from the ganglion, v, is well shown. 

 Figure 13, a longitudinal, vertical section of the eye. X 476 diameters. 



Solitary Form. 



Figures 14 and 15, transverse sections of the ganglion and eye. Fig. 14 cuts the 

 two anterior limbs ; Fig. 15 the posterior curved portion. The large ventro-lateral 

 outgrowths from the ganglion, vl, are shown. X 300 diameters. 



