P0LYCHJ5T0US ANNELIDS OF THE HAWAIIAN ISLANDS. 
1157 
Genus THALENESSA Baird. 
Thalenessa oculata McIntosh. 
Thalenessa oculata McIntosh, Report Challenger Expedition, vol. xn, p. 142, pi. xxi, figs. 1, 2, pi. xxm, fig. 12, 
pi. xxv, fig. 3, pi. xnr A, fig. 11, 12. 
I have identified this species from the description given by McIntosh, though his figures give 
little aid in determining the character of the head. His figure 1, plate xxi, looks as if the head had 
been drawn without removing the anterior pair of elytra, and neither this nor figure 2 shows either 
antennae or tentacles. His description is, however, so clear that there can be no error in the determi- 
nation. The compound ventral setae may show more than two segments in the terminal portion. In 
the first seta-bearing parapodium I find as many as 9 of these terminal segments. 
Collected at station 3833, 142-88 fathoms, on sand, pebbles, and broken shell; station 3955, 
20-30 fathoms, on coral rock; station 3936, 79-130 fathoms, on broken shells and corallines, and station 
4061, 24-83 fathoms, on coral sand, coralline nodules, and foraminifera. 
Family APHRODITIDiE. 
Genus APHRODITA Linnaeus. 
Aphrodita echidna de Quatrefages. 
Aphrodita echidna de Quatrefages, Anneles 1, p. 197. McIntosh, Report Challenger Expedition, vol. xii, p. 36, pi. vii, 
fig. 1, 2, pi. VI A, figs. 2-3. 
The setae of these forms differ somewhat from those described by McIntosh. The large dorsal setae 
bend sharply at the end to form a terminal hook, and the ventral setae of both kinds, instead of a thick 
basal and slender terminal, pilose portion, show a gradual narrowing from the basal to the terminal 
parts. The pilose patch leaves uncovered the extreme end, which protrudes as a gently curved, stout 
spine, resembling in this respect the setae of Iphione spinosa (op. cit., pi. vm, A, fig. 5). McIntosh 
states, however, that his figure was drawn from a specimen probably undergoing regeneration. 
Just dorsal to the larger ventral setae in some somites (I could not find them in all) is a bundle of 
delicate colorless setae. Each has a strong lateral tooth near its end, and shows a distinct toothing 
beyond that (fig. 24). 
Fig. 24. — Seta from Aphrodita echidna, x 183. 
Elytra may have more or less of a fulvous coating above and below, or may be entirely free from 
it. The felt formed by fine threads covering the dorsal surface is filled with debris of various sorts, 
containing diatoms, radiolaria shells, and small annelid sand tubes. 
Collected at stations 4081, 202-238 fathoms, on a bottom of gray sand, and 4082, 256-283 fathoms, 
on a bottom of fine volcanic sand. 
Genus LIETMONICE Grube. 
Laetmonice producta wyvillei McIntosh. 
Lsetmonice producta Grube, Monatsber. k. Akad. zu Berlin, 1877, p. 512. 
Lsetmonice producta var. wyvillei McIntosh, Report Challenger Expedition, vol. xii, p. 44, pi. vii, fig. 3, pi. iv A, 
figs. 9-11. 
Dorsal spines nearly all broken or lost, so that it was difficult to get one intact for examination. 
They agree with McIntosh’s description, except that they show numerous nodules along the shaft, 
which he does not figure. The villous character of the ventral surface is not as marked as in the 
specimens described by McIntosh. 
Collected at station 4004, 773-645 fathoms, on a bottom of brown mud and rock; station 4038, 
689-670 fathoms, on a bottom of gray mud and foraminifera; station 4036 on bottom of fine gray sand, 
in 687 fathoms. 
