2O2 METCALF AX.D JOHNSON. 



The large eye projects from the antero-dorsal face of the gan- 

 glion, and therefore lies almost wholly anterior to the ganglion. 

 Its projection to the right or left of the mid-line of the body is 

 slightly less than that of the eye of Cyclosalpa dolichosoina- 

 virgnla. The eye is relatively short, and tapers but slightly 

 toward the tip. The dorsal pigment layer extends more than 

 half way down over the tip (Figs. 12 and 13, dp], thus enveloping 

 the dorsal half of the anterior portion of the eye in a hood of 

 pigment. The lateral posteriorly-directed pigment bands (Fig. 

 15, //>), meet at the postero-ventral angle of the eye to form the 

 ventral pigment surface, which is of less extent than the dorsal 

 (Fig. i 2, 7'/>). Slightly posterior to the middle of the eye the 

 dorsal pigment dips down forming a pigment curtain (Fig. 12, 

 pc], which extends nearly half way through the eye, and is lat- 

 erally continuous with the lateral pigment layers (Fig. 14). This 

 pigment curtain is slightly dome-shaped with the apex of the 

 dome toward the anterior. Fig. 14 shows a section through the 

 pigment curtain just posterior to its apex. 



The rod-cells have the same general arrangement as in Cyclo- 

 salpa dolichosoma-virgula, but in Salpa pnnctata those pointing 

 ventrally (Fig. 12, in-*] exceed in number those pointing dorsally 

 (Fig. 12, rfV). This corresponds to the fact already mentioned 

 that the greater amount of pigment is on the dorsal surface. In 

 the middle of the eye, where it is entirely enwrapped by pigment, 

 the rod-cells point both dorsally and ventrally, with their thick- 

 walled ends central. None point laterally, as in Cyclosalpa dol- 

 ichosoina-virgida (compare Fig. 8, //-). The optic nerve enters the 

 eye above the thin-walled tips of the posterior rod-cells (Fig. 12, 

 oii], and the in nervation is believed to be the same as that of 

 Cyclosalpa dolichosoina-i nrgnla. 



A large group of intermediate cells lies between the dorsal 

 pigment and the ventrally-directed rod-cells (Fig. 12, /). A 

 smaller group lies between the ventral pigment and the few dor- 

 sally-directed rod-cells (Fig. 12, /'). In Cyclosalpa dolicliosonia- 

 virgida the intermediate cells are confined to those two regions, 

 but in the Salpa pnnctata the intermediate cells extend also be- 

 neath the lateral pigment layers. The position of the lateral 

 intermediate cells in Salpa pnnctata is the same as that of the 



