496 PETALOPROCTUS TERRICOLA. 
PETALOPROCTUS TERRICOLA, De Quatrefages, 1865. Plate CXXXVI, fig. 17—bristle, 17a— 
large spine, 17/—hook. 
Specific Characters.—Head fused with the buccal segment, and without a marginal ridge. 
Body about 18 cm. long, 2—3 mm. broad, and of twenty-four segments, twenty-two of 
which are setigerous. First segment distinctly separated from the buccal. First three 
segments have no ventral division. In the others there are two ventral tori, each with 
about forty crotchets. Dorsal bristles strong; yellow and winged, and others colourless, 
not winged, spinous. Behind the sixth or seventh segment are capillary bristles, sinuous 
and long (overlooked by Claparéde and Grube), with minute spines. In seven or eight 
posterior segments in front of the anal, between the dorsal and ventral divisions, is a fleshy 
process, adherent dorsally and poimting ventrally, separated by the two setigerous processes 
at the tori, and resembling those of Maldane cristagalli, Claparéde. Anal segment acheetous ; 
anus near the ventral edge, whereas in Maldane it opens toward the dorsum. Two or three 
furrows are prolonged from the ventral to the dorsal surface, which De St. Joseph regarded 
as rudiments of segments. 
SYNONYMS. 
1855. Clymene spatulata, Grube. Arch. f. Naturges., p. 114, pl. iv, figs. 12 and 13. 
1865. Petaloproctus terricola, De Quatrefages. Annel., t. 11, p. 247. 
1869. Clymene spatulata, Grube. Abhandl. Schles. Gesellsch., p. 127. 
1870. Petaloproctus terricola, idem. Arch. f. Naturges. (Jahr. 56), p. 317. 
1894. *, De St. Joseph. Ann. Sc. nat., 8° sér., t. xvu, p. 144. 
1914. x 5 Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 135. 
1922. + s McIntosh. Ann. Nat. Hist., ser. 9, vol. ix, p. 26. 
Habitat.—Blacksod Bay, Ireland (Southern). 
Abroad it occurs on the Atlantic and Mediterranean shores of France, St. Sébastien 
(De Quatrefages), Rocher-Vidé (De St. Joseph). 
The cephalic region of a specimen sent by Mr. Southern from Blacksod Bay 
resembles that in Nicomache, though somewhat longer, and more projecting ventrally. A 
keel arises a little above the mouth and runs vertically to the dorsal edge. The surface is 
speckled with pigment as in Nicomache maculata. Hach of the three following segments bears 
a spine below the dorsal tuft of bristles, four of these tufts characterising the anterior region. 
Three long segments follow those with the spines, the third the longest, with two hook-rows, 
viz., an anterior and a posterior. This segment is of softer consistence than those in front. 
The anal plate has an expanded, smooth margin which projects freely all round except 
dorsally, and has the anus on its posterior surface a little within the broad ventral rim, and 
it shows a radiate arrangement at its margin. Apparently two narrow rings next it are 
acheetous; that in front of these has a row of hooks and a tuft of bristles of considerable 
length. The dorsal surface of the third, fourth, fifth and sixth segments in front of the 
anal plate presents a median conical free flap pointing backward, the third having a pedicled 
process like a Loxzosoma attached to it. These eminences increase in prominence from the 
sixth backward. 
