Fig. 
Fia. 
Fra. 
Fic. 
Fig. 
Fie. 
Fic. 
Fira. 
Fia. 
Fra. 
i) 
6. 
-13 
14. 
15, 
IP III UNE 
Profile view of the keel and float of small Velella, measuring about $ inch in length: ca, outer 
chamber of the float; a, one of the concentric chambers; /, so-called liver; p, folds of the man- 
tle covering the keel extending from the canal at the base of the keel to the canal e at the 
edge of the mantle. 
Small Velela, about 4 of an inch in length, (seen from above) showing the few ramifica- 
tions of the so-called liver system, 7, seen through the float; s, rudimentary keel; ji, free 
edge of the mantle. 
Slightly more magnified view of a part of the edge of a young Velella, somewhat older than the 
preceding figure: v, principal ramifications; v’, secondary ramifications of the free edge of 
the mantle. 
Portion of the edge of a small Velella, measuring 3, of an inch in length: v’, primary 
ramifications; v’, secondary branches; g, marginal glands of the free edge of the mantle, seen 
from above. 
Portion of the edge of a small Velella, slightly older than the preceding figure, in which the 
principal ramifications still extend to the free edge of the mantle. 
Portion of the edge of the float of a small Velella, about in the same stage as the preceding 
figure, with proportionally larger marginal glands, but shorter secondary ramifications, than in 
Fig. 4. 
Portion of the edge of the mantle of a Velella measuring about one inch in length, with long 
. 
marginal glands g, with a simple free edge of the mantle e, extending beyond, and small 
clusters of yellow cells c, moderately closely packed along the outer edge of the mantle. 
Portion of the edge of the mantle of a Velella, measuring about two inches in length, with a 
fringed free edge of the mantle e, beyond the marginal glands g, with large patches of yellow 
cells c, closely packed together over the whole of the free edge of the horizontal mantle be- 
yond the float. 
Somewhat more magnified view of a part of the horizontal mantle of the float, to show the shape 
of the ramifications of the so-called liver canals extending between the patches of yellow cells. 
Single cluster of yellow cells with the fan-shaped terminations of the liver canals, 
Portion of the outer edge of the horizontal mantle of a Velella, in which the ramifications of the 
vascular system terminate in sacs more or less filled with clusters of yellow cells. 
Separate clusters of terminal extremities of the vascular system of a Velella nearly in the stage 
of the preceding figure, taken near the edge of the float. 
Pouch-like terminal clusters of the vascular system filled with yellow cells, seen from above near 
the glandular band of the mantle. 
Shows the delicate dendritic ramifications of the large vascular (liver) canals seen from the 
lower side of the float, entirely free from accumulations of yellow cells. 
Part of one of the main vascular tubes, with large star-shaped ramifications and large clusters of 
yellow cells, seen from the upper surface, near the float. 
