432 MYSTIDES (MYSOMYSTIDES). 
of which are entered in the Plymouth list, appear to be only varieties of the common form, 
viz., H. viridis. i 
Mystipes (Mysomystiprs) trmpata, De St. Joseph, 1888. Plate CXXXIV, fig. 9—bristle. 
Specific Characters—Head bearing four minute tentacles in front, and posteriorly two 
large, reddish eyes. Body 7—20 mm. long, with forty to ninety segments. Buccal segment 
with two slender tentacular cirri; the following segment with another pair, and the ventral 
showing a shght enlargement. Proboscis with a ring of about ten papille, and its inner 
surface is coated with large conical papille. Anal segment has a pair of fusiform cirri. The 
foot has oval dorsal and ventral cirri, and a bifid setigerous lobe. The short and stout 
bristles are curved, and the end of the shaft has a strong tooth and a series of spines on 
each side. The distal blade is coarsely serrated and obliquely striated. Mature males 
and females are provided with swimming-bristles (De St. Joseph), which in a female of 
ninety-two segments extended from the thirty-fifth backward. 
SYNONYMS. 
1888. Mystides (Mysomystides) limbata, De St. Joseph. Ann. Sc. nat., 7° sér., t. v, p. 310, pl. xiii, 
fies. 186—192. 
1896. 5 limbata, Gravier. Bull. Sc. Fr. et Belg., sér. 4, t. xxix, p. 299 et seq. 
1914. he (Protomystides) limbata, Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 72, 
pl. vii, figs. 18 a, B. 
1915. ee limbata, Allen. Journ. M. B. A., vol. x, p. 518. 
1921. es B McIntosh. Ann. Nat. Hist., ser. 9, vol. vin, p. 297. 
Habitat.—-West Coast of Ireland (Southern); Plymouth (Allen). Shores of France 
(De St. Joseph, Gravier). 
This is a small form, the head bearing four minute tentacles in front, and two large 
reddish eyes posteriorly. The buccal segment has two slender tentacular cirri, and the 
following segment has another pair, the ventral presenting a slight enlargement. The pro- 
boscis has a ring of about ten papillee, and its inner surface is coated with large conical papille. 
The anal segment has a pair of fusiform cirri. The foot has oval dorsal and ventral cirri 
and a bifid setigerous lobe. The short, stout bristles (Plate CX XXIV, fig. 9) are curved, 
and the distal end of the shaft has a strong tooth and a series of spines on each side. 
The terminal blade is coarsely serrated and obliquely striated. Mature specimens have 
swimmine-bristles. 
Southern distinguishes it by the fan-shaped array of spines at the end of the shaft of 
the bristles (a feature, however, found in other forms), and by the winged expansion of the 
ventral tentacular cirrus on the second segment. Allen observes that a female with dark 
green eggs occurred in May, and that a small median tentacle exists as in Hulaha, “ but in 
the majority of specimens it is difficult, if not impossible, to make it out.” 
De St. Joseph points out that certain Phyllodocids, such as Hulalia problema, Mern., 
have capillary bristles as in Syllids, and that Hulalia gracilis, Verrill, showed signs of scissi- 
parous development. The presence of large eyes and capillary bristles in M. limbata is 
another example, and he thinks it probable that at maturity these will be fully developed 
