478 FREDERICK KBEBLE. 
EXPLANATION OF PLATES 26—28, 
Illustrating Mr. Frederick Keeble’s paper on “The Yellow- 
Brown Cells of Convoluta paradoxa.” 
PLATE 26. 
Fre. 1.—Weed from Paradoxa zone with C. paradoxa(x 3). Egg cap- 
sules laid on weed seen as orange dots. The large weed Pycnophycus; the 
small weeds Ceramium and Rhodomela. 
Fie. 2.—Hgeg capsule (x 40) with orange-pigmented eggs attached to weed 
of Paradoxa zone. . 
Vie, 3.—Hge (x 300) showing the pigment bodies irregular and dumb-bell 
shaped; but no yellow-brown cell. 
Fie. 4.—Young C. paradoxa (x 70) two days after hatching. Body 
gorged with diatoms, ete., and containing one yellow-brown cell. The chief 
excretory band, already indicated, running transversely, a little distance behind 
the mouth. 
Fig. 5.—C. paradoxa (xX 50) showing the yellow-brown cells and the 
concrement granules (black by transmitted light). 
Fic. 6.—The yellow-brown cells (x 70) as seen through the epidermal 
tissues in the living state. The orange glandular structures are also visible. 
PLATE 27. 
Vie. 7.—The yellow-brown cells (. 2, 75) as seen when the animal is 
examined soon after capture. 
Fic. 8.—The cells as seen when the animal is examined immediately 
alter capture. The clear anterior end of the yellow-brown cells is well 
marked, whereas in Fig. 7 it is not generally visible ; and the cells, as well as 
the animal tissues, contain numbers of fat globules which are absent or very 
scarce in Fig. 7. 
Fie. 9.—Yellow-brown cells showing fat undergoing excretion from their 
clear anterior ends. 
PLATE 28. 
Fic. 10.—C. paradoxa (xX 20). (a) Mature female with eggs; (4) mature 
male; (c) immature animal seen from dorsal, and (@) from ventral surface. 
The bands and masses of excretory substance (concrement granules) appear 
