EUSYLLIS LAMELLIGERA. 457 
and longer than the others. Dorsal cirri alternately long and short, and behind the first 
few segments they are smooth. Bristles of two kinds, either short bidentate tips, or with 
long, slender, tapering tips. Mature in March. 
SYNONYMS. 
1881. Ehlersia ferruginea, Langerhans. Nova Acta Ksl.-Carol. Deutscher Akad., Bd. xlun, Halle, 
p. 104, 'Paf. iv, fig. 10 a, b. 
1914. Syllis (Hhlersia) ferrugina, Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 38. 
1921. Ehlersia ferrugina, McIntosh. Ann. Nat. Hist., ser. 9, vol. viii, p. 306. 
Habitat.—Blacksod Bay in Laminarian roots (Southern). Abroad it occurs at Madeira 
(Langerhans). 
Southern found a mature female in March, with a long tuft of swimming-bristles on the 
twenty-eighth segment, and no sign of a bud, so that it probably reproduces directly, 
and may pertain to Pionosyllis lamelligera, De St. Joseph. It differs from Syllis cornuta, 
Rathke, in having smooth dorsal cirri, and m the structure of the bristles, which, however, 
diverge very little from those of #. cornuta, Rathke. The figures of Langerhans, repre- 
senting the bristles of the second and twenty-third seements (Plate CXX XVIII, fig. 7), 
are the only ones available. 
EUSYLLIS LAMELLIGERA, Marion & Bobretzky, 1875. Plate CXXXVII, figs. 5 and 5a— 
head and bristles. 
Specific Characters—Head somewhat circular, with cilia along its posterior border ; 
eyes three pairs, all with lenses, the anterior pair smallest, the middle the largest. Palpi 
considerably developed, soldered at the base. Median tentacle long and robust; lateral 
shorter ; tentacular cirri well developed. Body similar to that of H. Blomstrandi, 10—15 
mm. long, and having about fifty-three segments. Proboscis with a dorsal stylet and two 
olandular tubes; proventriculus with twenty-two rows of violet points, and occupying 
segments 8 to 10. First ventral cirrus lamellar. Dorsal cirri alternately long and short. 
The violet ova or the sperms appear in the twelfth and following segments, twenty of which 
have swimming-bristles. Coloration dull grey, the tips of the tentacles brownish, the 
proboscis brown, the proventriculus violet, the imtestine greenish, becoming colourless in 
the terminal segments (De St. Joseph). 
SYNONYMS. 
1875. Eusyllis lamelligera, Marion and Bobretzky. Amn. des Sc. nat., 6° sér., t. 11, p. 33, pl. in, fig. 9. 
Bt . 2 Marion. Compt. Rend., t. Ixxx, p. 498. 
1886. is 5 De. St. Joseph. Ann. Sc. nat., 7° sér., t. i, p. 169. 
1915. a ae Allens Journ MS BVA Nest, vol. x, p. 099. 
1922. - ~ McIntosh. Ann. Nat. Hist., ser. 9, vol. vin, p. 307. 
Habitat.—Dredged on Mewstone Ledge and Eddystone Grounds, Plymouth (Allen). 
Hlsewhere it occurs in the Mediterranean (Marion and Bobretzky), and at Dinard, France 
(De St. Joseph). 
Allen observes that it is'a well-defined species, distinguished by the enlarged and leat- 
