458 EUSYLLIS MONILICORNIS. 
like shape of the first ventral cirri. He dredged a female with nearly ripe eggs in July on 
oO 
8 
Mewstone Ledge, Plymouth. Marion and Bobretzky procured a ripe male in January, 
without swimming-bristles. They consider that though it approaches HL. Blomstrandy in 
the non-moniliform dorsal cirri, in the fusion of the palpi at the base, and in the presence 
of six distinct eyes on the head, it is different (Plate CX X XVII, fig. 5). The first dorsal 
cirrus is long, and the first ventral cirrus is foliaceous. The bristles (Plate CXXXVH, 
fig. 5a), moreover, differ. No example has been seen by the writer, but Dr. Allen intends 
to publish an account of this and other forms he has recently procured. 
EusyLuis MoNILICORNIS, Malingren, 1867. Plate CXX XV, fig. 13—head and anterior region. 
Specific Characters—Head with six eyes, two small, the first segment forming a pad 
behind it. Tentacles indistinctly articulated, but in contraction moniliform. Palpi rather 
long, but fused at the base. Body comparatively large, 10—15 mm. long, and having fifty- 
two to sixty-seven segments. Dorsal cirri of the second and fifth segments longer than 
the following, which are unequal amongst themselves. Proboscis in segments 2—6, 
without lateral pouches, and with its crown of papillee little developed ; a large dorsal stylet 
with a poison-canal, and a transverse brown bar a short distance from the proventriculus, 
as well as one in front. Proventriculus with sixty-five to eighty rows of points (De 
St. Joseph) in segments 7—11. Stomach with two lateral pouches, of a brownish 
colour like the imtestine, ciliated mternally. Sexual elements in segments 16—52 with 
swimming-bristles. Ripe examples have two orange segmental organs in the form of curved 
tubes from the fifteenth segment. Feet show two kinds of bristles, viz. those with short 
and those with long tips. First segment with a single spine; the following twenty-nine have 
three—one a large crochet, and two with button-like tips. The thirteen succeeding have 
only a hooked spine, which in the last twelve is accompanied by compound bristles, a simple 
capillary bristle and a bifid bristle. The general coloration is pale orange, the hind part of 
the head having a patch of dark brown or black pigment. 
Langerhans procured ripe examples from October to January, the eggs being brownish- 
yellow. The males had swimming-bristles at the twentieth segment and the females at the 
sixteenth. 
SYNONYMS. 
1867. Husyllis monilicornis, Malmgren. Annul. Polych., p. 41, Tab. vi, fig. 44. 
Soom neers a Marion. Compt. rend., t. Ixxx, p. 498. 
‘ 4 i idem. Revue des se. nat., t. iv, p. 305, pl. vi, figs. 1—3. 
_ 5  assimilis, Marenzeller. Sitzb. K. Akad. wiss. Wien, 2 Beitr., p. 30, pl. iii, fig. 2. 
1879. »  monilicornis, Langerhans. Zeitschr. f. wiss. Zool., Bd. xxx, p. 551, pl. xxxii, fig. 18. 
1883. be > Levinsen. Vid. Meddel. naturh. Forhand]. Copenhagen, p. 245. 
1893. 55 5 Malaquin. Recher. Syllid., pp. 79 et seq., pls. 1 et seq. 
1894, A = Bidenkap. Christiania Vidensk.-selsk. Forhandl., p. 90. 
1914. 3 in Fauvel. Camp. Sc., p. 104. 
1915. 5 3 Allen. Journ. M. B. A., n.s., vol. x, p. 599. 
192]. ba a McIntosh. Ann. Nat. Hist., ser. 9, vol. viii, p. 307. 
