92 
THE VOYAGE OF H.M.S. CHALLENGER. 
A pale protoplasmic mass is frequently observed to issue from the torn bases of these 
cirri. Stretching through this mass are granular lines which at intervals dilate into what 
ajDpear to be ganglion-cells (with granules and nuclei). It is not yet knovm whether 
these are hypodermic or nervous elements. The ventral cirri show a marked constriction 
above the basal enlargement, and the majority have indeed separated at this point. 
' They are rather slender, reach a little beyond the bases of the bristles, and have a few 
somewhat short clavate papillse on their surfaces. The ventral papilla is largely 
developed, especially towards the middle of the body. It appears as a considerale pro- 
cess on the fifth foot (sixth if that bearing the tentacular cirri be calculated). A ridge of 
skin runs inwards from the base of the papilla nearly to the ventral groove. 
The fragmentary example from Station 150 fortunately carried two somewhat 
Fig. 1. — Remarkable parasitic structure on the twenty-first foot of Eulagisca corrientis. 
oblong scales. These are comparatively small, have their surface flecked with pale 
brownish touches, are comparatively smooth over the greater part of the area, and have 
a few long clavate cilia at the posterior border. 
The dorsal branch of the foot bears a series of long pale bristles of somewhat 
uniform diameter and with wide rows of short spikes (PL 'VIIa. fig. 3, one of the 
intermediate or average forms). The tip is bare for a short distance, and the dorsal 
curve of the bristle is more pronounced than the ventral. By transmitted light the tips 
are slightly opaque, apparently from increased density, the rest of the bristle being 
translucent. The first foot (bearing the tentacular cirri) has its dorsal bristles directed 
forward. 
The ventral l^ristles are all attenuated and translucent, the upper series having very 
