GRUBEA PUSILLA. 449 
GRUBEA PUSILLA, Dujardin, 1851. Plate CXXXV, fig. 5—head and anterior region. 
Specific Characters—Head with long, soldered palps; lateral tentacles toward the 
anterior part of the head, median in front of the posterior border, all enlarged toward the 
base, tapered distally. Hyes four, anterior pair wider apart, and all with lenses. Body 
2—5 mm. long, pale; segments twenty-eight to thirty-four. Buccal segment showing on the 
dorsum. Dorsal cirri somewhat truncated distally, and with bacillary bodies internally, 
opaque brownish. Two anal cirri and an appendix. Pharynx (proboscis) yellowish brown 
with a pale rmg; tooth some distance behind the anterior border ; intestine dull greenish. 
Proventriculus with fifteen rows of points. Bristles with long, simple, distal pieces hooked 
at the tip, bidentate, and spimous on the edge below, those with the longer tips 
absent in the last segments. Both ventrally and dorsally is a simple bristle, slightly hooked 
at the tip—dorsally from the fifth foot in front, ventrally only in the last three segments. 
° SYNONYMS. 
1851. Hxogone pusilla, Dujardin. Ann. Se. nat., 3™¢ ser., t. xv, p. 299, pl. v, figs. 9 and 10. 
1864. Spherosyllis pusilla, Claparéde. Glanures, p. 89, pl. vi, fig. 3. 
1865. Brania pusilla, De Quatrefages. Annel., t. 11, p. 18. 
1868. Grubea ,,  Claparéde. Annél. Nap., p. 207. 
1874. & +s Marenzeller. Sitzb. K. Akad. Wiss. Wien, Bd. lxix, p. 451. 
1879. Bravia ,, Langerhans. Zeitschr. f. wiss. Zool., Bd, xxxu, p. 565. 
1886. Grubea ,, DeSt. Joseph. Ann. Sc. nat., 7° sér., t. 1, p. 203, pl. x, figs. 77—78. 
1914. Pr nt Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 22. 
1915. é >»  Aullem, domi, IML, 18}, Boy Wolk x jo, Ash 
1921. AS 3 McIntosh. Ann. Nat. Hist., ser, 9, vol. vii, p. 201. 
Habitat—Blacksod and Clew Bays, and at Clare Island on seaweeds, Laminarian roots, 
and amongst Lithothamnion on shore, and to a depth of 16 fathoms; surface tow-net at 
night in Ballynakill Harbour (Southern). Common amongst Laminarian roots from Rum 
Bay, Plymouth (Allen). 
Distribution.—St. Malo (Dujardin) ; Baltic (Cirsted). Amongst Fuci, shores of France 
and Laminarize, Port Vendres, Normandy (Claparéde) ; Dinard, where it is less common in 
the dredge than G. clavata (De St. Joseph). The Canaries (Langerhans); Mediterranean. 
The head (Plate CXXXV, fig. 5) has long, soldered palps; lateral tentacles toward 
the anterior border, the longer median in front of the posterior border, all having the 
fusiform enlargement at the base, whilst they are tapered distally. The four eyes are 
furnished with lenses, and the anterior are wider apart. There are four tentacular cirri. 
The proboscis is smooth, with a tooth near anterior end. The body is about 2—5 mm. in 
leneth, and has from twenty-eight to thirty-four segments. Posteriorly Langerhans 
describes an unpaired median appendix between the anal cirri. Feet with the fusiform 
dorsal cirri truncated, with bacilli in the interior. Ventral cirri filiform, short, the ventral 
bristles have long, simple terminal pieces, bidentate, and with spines along the margin 
distally. 
Reproduction.—Ripe females were found by Dujardin, Marenzeller and Langerhans, 
the latter stating that in one with thirty segments two eggs occurred in each segment from 
the eleventh to the twenty-second. De St. Joseph (1886) mentions that the males have 
