REPORT ON THE ANNELIDA. 
495 
developed, and the basal line is very slightly convex. The body and basal process are 
closely striated. 
The intestinal pellets showed a few sponge-spicules, minute Glohigerince and 
Radiolarians, with an occasional long hair from a minute Crustacean. 
Externally the body- wall shows cuticle and hypoderm with pigment. The latter forms 
a prominent cushion with a central fissure over the median ventral region. Sections of 
what appear to be coils of blood-vessels also occur in this region. The circular muscular 
coat is somewhat stronger dorsally than ventrally, where in the middle line it spreads 
out a little below the nerve-cords. The latter are ovoid, and have a large neural canal, 
with a limpid coagulable fluid. The ventral blood-vessel lies between them superiorly. 
The longitudiual dorsal muscles toward the end of the anterior third of the body are more 
than twice the bulk of the ventral. They form a long symphysis in the middle line, 
and the suspensory ligament of the alimentary canal springs only from the inferior end 
of the junction. They are most massive at the bulbous external border. These muscles 
are traversed by various vertical fibres, which join the line of fibres bounding the inner 
surface of each muscle. The ventral muscles are sausage-shaped, and in section 
diminished at each end. They are also intersected by vertical fibres. A slender 
band connects the under surface of the digestive canal with the blood-vessel and central 
area between the nerves. 
This species is widely distributed, since it occurs both on the British coasts and the 
Atlantic shores of Southern Europe, as well as the Mediterranean. 
No tube was present, but Montagu and Claparede found it either of mud or of small 
stones. The site of the tube in this genus is occasionally remarkable. Thus Claparede ^ 
found that of Brancliiomma vigilans placed amongst the felted hairs of Aphrodita aculeata 
at Naples, the posterior end of the tube being fixed to the head of the unwilling host, and 
the anterior opening either at the anus or laterally between the feet. A very similar species 
was found by Semper in the Philippines, and termed by Grube Sabella acrophthalmosd 
Dasychone, Sars. 
Dasychone hairdi,^ n. sp. (PI. XXXa. figs. 13-15 ; PI. XXXVIIIa. figs. 5, 6 ; 
PL XXXIXa. figs. 2, 9). 
Habitat. — From the shore at Bermuda, June 1873. 
The length of an average example is about 55 mm., of which the branchiae form 
18 mm. The diameter in front is 4 mm. 
The body of this form presents a somewhat flattened aspect, more rounded, however, 
^ Annfel. Chetop., Supplement, p. 137. ^ Annel. Fauna d. Philippinen, p. 258. 
^ Named in remembrance of Dr. Baird, who did valuable work amongst the Annelidan and other departments iu 
the British Museum. 
