CHRYSOPETALUM DEBILE. 421 
the cephalic lobes, so largely developed in the young, the ovoid anal processes, and the 
nature of the feet and bristles all point to this conclusion. Such young examples seem to 
be rare, and I am indebted to Mr. Chadwick’s! courtesy for the slide containing the examples. 
Famity PALMYRIDZ, 
(Chrysopetalea, Ehlers.) 
Head rounded and short, with eyes, tentacles, and tentacular cirri; segments with 
massive appendages, the paleze of which cover the dorsum. Alimentary canal akin to that 
of the Kuphrosynidee, Aphroditidee and Polynoide. 
Genus CHRYSOPETALUM, Ehlers, 1864. 
Head with three tentacles and two palpi. Body with few segments, short and broad ; 
first segment with four tentacular cirri; dorsal process with a spine bears a fan of palez 
im each segment ; foot with a dorsal cirrus, a setigerous process with jointed bristles. 
CHRYSOPETALUM DEBILE, Grube, 1855. Plate CX X XVI, fig. 1—dorsal bristle. 
Specific Characters—Head transversely oval, eyes two, small; tentacles five, the two 
inferior much larger, with a basal articulation, the three upper filiform, enlarging at the 
base, the outer the length of the tentacular cirri. Body oblong, whitish, segments about 
twenty-two and nearly equal, 2°5 lines long, and with a total breadth of half a line. 
Foot with a short, straight spine; dorsal cirri filiform, enlarged at the basal articula- 
tion. Dorsal division of the foot with bristles like pales, slightly curved, spathulate, one 
margin straight, the other curved, the tip with about eighteen crenulations; ventral 
division with a tuft of straight compound bristles, spmous and transversely striated. They 
do not reach the tip of the setigerous process. 
SYNONYMS. 
1855. Palmyra debilis, Grube. Arch. f. Naturges., Bd. xxi, p. 90. 
1864, (Palmyropsis) Eveline, Claparéde. Glanures, p. 126, pl. vin, fig. 6. 
Palmyrides portus-veneris, idem. Ibid., p. 123, pl. vin, fig. 5. 
»  Chrysopetalum fragile, Ehlers. Borstenw., p. 81, Taf. 11, figs. 3—9. 
1865. Chrysopetalum debile, De Quatrefages. Annel., t. i, p. 296. 
35 fragile, idem. Ibid. 
2) 
1880. ce » and cecewm, Langerhans. Zeitschr. f. wiss. Zool., Bd. xxxii, p. 278. 
1897. ? 5 occidentale, Johnson. Proc. Califor. Acad. Sc., ser. 9,1, p. 161. 
1906. 5 debile, De St. Joseph. Ann. Sc. nat., 9° sér., t. 11, p. 146, ete. 
1913. mA »  Fauvel. Bull. l’Instit. Oceanogr., No. 270, p. 35. 
1914. 5p c » Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 60. 
ey B i Fauvel. Camp. Sc., p. 95. 
1921. - ss McIntosh. Ann. Nat. Hist., ser. 9, vol. vii, p. 291. 
1 Vide ‘Ann. Nat. Hist.,’ ser. 9, vol. vin, p. 290. 
