REPORT ON THE ANNELIDA. 
153 
Between the feet, and stretching upward toward the dorsal median line, are 
many minute commensalistic bodies resembling Infusoria, but apparently Rotifera. 
They are somewhat ovoid and nearly sessile. Along the ventral median line are 
numerous small pure white masses under the skin, which show a vast aggregation of 
distinct cells of equal size, ovoid in outline and containing a granular organism (apparently 
embryonic internally). The masses appear to be similar to those which occurred in 
Nychia cirrosa from Greenland. 
In transverse section the body -wall presents certain peculiarities. The dorsal longi- 
tudinal muscles form a thin layer superiorly, but interiorly are lobate and massive. The 
ventral longitudinal muscles are thinner, and more expanded than in the previous species, 
and the superior fold at the outer border is also elongated and flattened. The nerve-area 
is wide, and an oblique slit occurs at the inner border of one of the nerves. The 
proboscis shows on each side of the polar ridge a peculiar curvature, apparently due to 
the acuteness of the ridge. The hypoderm of the organ is dense and somewhat 
brownish (?). Attached to the base of a foot in one example was the following Crustacean 
parasite. A similar form was found on Leanira hystricis from the south-west of Ireland. 
Leaniricola rotundata, n. gen. et sp. 
The outline of the cephalo -thorax of this form is peculiarly rounded (woodcut. Fig. 2), 
the cephalic region, however, being distinctly indicated by 
an interior central projection or rostrum, and a lateral notch 
on each side. The anterior antennse have in addition to the 
usual fine hairs stout curved processes, consisting of the 
ordinary coats of the antennae, and which give the organs 
a somewhat branched appearance. The second pair of 
antennae seem to be minute, probably about the length of 
the three terminal segments of the first pair, and formed 
apparently of three or four segments, the terminal being 
furnished with long spinous processes. The mouth-organs 
present an arrangement similar to that in Nereicola. 
Three pairs of limbs are visible, two larger anterior, and 
the rudimentary third process observed on the side ofthe body 
posteriorly. The first pair are minute, the basal portion 
giving attachment to two short and rather broad limbs, 
each of only two segments. The terminal division of the 
longer limb has three short, claw-like, spinous processes on 
one side, and four longer and more delicate spines on the other. A single curved 
spinous process occurs on the first division of the limb. The shorter limb presents a 
(ZOOL. CUALL. EXP. — PART XXXIV. — 1885.) LI 20 
Fig. 2. — Leaniricola rotundata, u. gen. 
et .sp., parasitic upon Leanira areolata. 
