24 Prof. M‘Tntosh’s Motes from the 
Macrocheta clavicornis, Sars, was procured between tide- 
marks in Blacksod Bay, and dredged elsewhere on the West 
Coast of Ireland (Southern). The head is distinctly defined, 
with a median process to the blunt snout, and four large eyes 
arranged nearly transversely, the larger being external. 
T'wo clavate palpi arise from the peristomial segment; four 
pairs of somewhat clavate cirri from the next four segments. 
The body is from 0°75 to 1 cm., somewhat spindle-shaped 
in spirit, and densely covered with papilla. Tufts of long 
translucent bristles with minute spines occur dorsally, whilst 
ventrally are peculiar, flattened, large, transparent, and arti- 
culated hooks and bifid tips. Its wide distribution is shown 
by its occurrence in Norway and Madeira. In general 
aspect, at first sight, this form resembles a Chloremid, and 
it has a densely papillose skin and long, slightly spinose 
bristles. The papille agree in minute structure with those 
of the Chloremids, and mud and sand occur in the inter- 
stices. The pigmented anterior region ends bluntly, with 
a median process, somewhat like the central apparatus of 
Stylarioides arenosa. The four eyes, arranged nearly trans- 
versely, are very distinct. The example, kindly sent by 
Mr. Southern, is mature, since the posterior region had 
many large ova. The alimentary canal harboured Opaline 
with two vacuoles. 
Marion and Bobretzky * (1875) describe Heterocirrus 
frontifilis, Grube, from Marseilles, which, in many respects, 
agrees with Macrocheta. 
In the family of the Halelminthide is Notomastus rubi- 
cundus, Keferstein, from fine clean sand, Plymouth (Allen). 
The cephalic region is conical, with four larger eye-specks 
and two groups of smaller eyes in front, a lobulated nuchal 
organ on each side. Body 10 cm. long and 2 cm. broad, 
vermiform, slightly enlarged anteriorly about the sixth seg- 
ment, tapered posteriorly, and ending ina button-shaped tail, 
all with neural parapodia and dorsal parapodial gills (Hisig). 
Genital opening at the fifth pair, and two in the sixth. 
Thorax reddish, abdomen brownish or yellowish green, or 
bluish green anteriorly. Bristles simple, winged, tapering ; 
eleven pairs. Abdominal hooks with four teeth in lateral 
view, from the thirteenth segment backward. Mature from 
December till May. 
Keferstein, who discovered this species at St. Vaast-la 
* Ann, Se. Nat. 6° sér. t. ii. p. 64, pl. viii. fig. 18, and pl. ix. fig, 18, 
tach 
