448 GRUBEA LIMBATA. 
its tip being enlarged and smooth (Plate CX X XV, fig. 2a). A simple dorsal bristle appears 
in the seventh foot, and is joined in the posterior seven segments by a similar ventral bristle, 
this type bemg curved and pointed with a spur at the base as in various Syllids. A female 
in May had two ova in each segment from the tenth to the twenty-second (Southern), 
GRUBEA LIMBATA, Claparede, 1868. Plate CXXXV, fig. 4—head and anterior region ; 
fig. 4a—bristles. 
Specific Characters—Head has four large eyes with lenses, the anterior pair wider 
apart; tentacles slightly fusiform. Buccal segment not distinct on the dorsum, but con- 
spicuous ventrally. Body pale, 3 mm. in length, and having in mature examples twenty- 
seven segments. Dorsal cirri of the second segment not longer than the others. Proboscis 
straight, with a crenulate lateral margin, the striated pigment of the organ having a 
transverse pale band, and the pigmented central region being separate from the pale lateral. 
Compound bristles with simple, slightly hooked terminal pieces. 
SYNONYMS. 
1868. Grubea limbata, Claparéde. Annél. Nap., p. 208, pl. xin, fig. 4. 
1879. * 5 Langerhans. Zeitschr. f. wiss. Zool., Bd. xxxui, p. 566. 
1884. i i Viguier, Arch. Zool. Expér., t. u, p. 103. 
1915. o y Allen. Journ. M. B. A., vol. x, p. 598. 
1921. 5 rf McIntosh. Ann. Nat. Hist., ser. 9, vol. vin, p. 301. 
Habitat—Amonegst laminarian roots at low water, and dredged in 4—5 fathoms at 
Plymouth (Allen). 
Abroad it occurs at Naples (Claparéde). 
The head (Plate CX XXV, fig. 4) has a similar arrangement of the tentacles to that in 
G. clavata, the two lateral being anterior, the median posterior, and they are somewhat 
fusiform, the base being enlarged, whilst the distal region is tapered. Four large brownish 
eyes occur posteriorly, the anterior being wider apart, and all have lenses. The proboscis 
occupies segments 2—5, and has no denticulations on the anterior rim, but the lateral walls 
are crenulate. The pigmented layer is marked by a pale ring as in G. tenwcirrata, and the 
organ presents a glandular appearance. The proventriculus is in segments 6—8, and has 
twenty rows of dots; its anterior part seems as if clothed with a horny coat, which may be 
a continuation of the proboscidian tissue. The stomach is in segment 9, and has a pair of 
glandular pouches. The chloragogenous intestine follows. The compound bristles (Plate 
CXXXV, fig. 4a) have rather short, shghtly hooked terminal pieces. 
Reproduction.—_In an adult male Claparéde noticed seventeen pairs of long swimming- 
bristles, the first on the ninth segment, the last on the penultimate. The extruded ova are 
carried on the dorsal cirri in pairs. In the dorsal position of the ova it agrees with Syllides. 
Exogone and Spherosyllis carry them ventrally. Recently Caullery and Mesnil* have found 
in this species a sexual stolon and schizogony. 
' «Bull, Soc. Zool. France, xlii, pp. 34—40, w. figs. 
