of Edinburgh, Session 1873-74. 
389 
or sandy mud, requiring nothing more than simple engulfment. 
Anteriorly, what may he termed the oesophageal division of the 
canal has internally a well-defined margin, covered with closely-set 
cilia, the wall consisting of the usual granular gland-cells, em- 
bedded in a hyaline stroma, with muscular fibres. Posteriorly, it 
is more opaque and granular, and appears to end in an anus without 
processes. All the specimens, however, were imperfect. The 
organ is thrown into innumerable rugae internally ; while externally 
it is kept in position by the dorsal and ventral fibres formerly 
noted, as well as by the dissepiments. The broad inferior fibres 
pass to the transverse band at the raphe, and a few even extend in 
some sections to the exterior border of the cellular coat in this 
region, at the nerve-cords. 
Nervous System . — It is somewhat difficult to make out the 
arrangement of the cephalic ganglia in the specimens ; but they 
are situated in the snout, near the eyes, and form two slightly tinted 
masses, terminating on each side in a buccal cord, which passes 
downwards to the ventral surface, and extends along the body 
beneath the transverse band of the raphe. The cords are larger in 
front, and somewhat farther apart, but throughout the rest of the 
body are closely approximated. The usual granular sheath sur- 
rounds them, and they are also protected by part of the cellular 
coat inferiorly. 
In comparing the foregoing form with the representatives of the 
Opheliidce at present described, it is at once distinguished by the 
absence of bristles. In Ammotrypane the united nerve-cords are 
situated at the ventral edge of the T-shaped prolongation of the 
body-wall inferiorly, and have a muscular column between them 
and the perivisceral cavity. In Ophelia the nerve-cord lies within 
the great longitudinal muscular cord, at the junction of the ventral 
prolongations (in transverse sections). The body-wall differs in 
the relative thickness of the several layers, and especially in the 
great bulk of the cellular coat in the new form. One of its nearest 
allies seems to be a new Ammotrypane dredged in Valentia harbour 
by Dr Gwyn Jeffreys, which shows a very minute trace of bristles, 
though the form of the body closely agrees with the Ammotrypane 
aulogaster of H. Bathke. In the Irish species, however, the united 
nerve-cords lie between the ventral ends of the powerfully- 
