268 ORIA  ARMANDI. 
it, the annelid withdraws itself ito its tube until the lower lip is on a level with the edge, 
and then by again setting the cilia in motion it releases the particles (Watson). 
Dugés (1837) figures the annelid (his Nas equisetina) inverted, the tail with its eyes 
being uppermost, and the cephalic filaments forming the posterior end, and his description 
corresponds. He probably observed it moving tail first. 
Grube thought there was no inversion of bristles and hooks in the posterior region, 
but Claparéde pointed out that 1t agreed with other Sabellids in this respect. 
Claparéde (1868) observes that Marcusen, finding this form at Odessa, and unaware 
of its presence in the Mediterranean, erroneously supposed that the fauna of the Black Sea 
approached that of the North Sea rather than the Mediterranean. 
Genus CLXVIII.—OrtA, De Quatrefages, 1865. 
Amphicorina, Claparéde, non De Quatrefages. 
Oridia,* Rioja, 1917. 
Cephalic region with a slight ventral collar passmg downward from each side of the 
dorsum; a pair of tentacles. Branchie few, five pairs; pinnules alternate. Body of 
. few segments, ventral collar on first segment. Eyes on the caudal segment. Bristles winged 
anteriorly, devoid of wings posteriorly. Crotchets of the anterior region uniform ; avicular 
hooks posteriorly. 
1. Ori ARMANDI, Claparede, 1864. Plate CXV, fig. 3—body; Plate CXXIX, figs. 5—5e 
: —bristles and hooks. 
Specific Characters.—Cephalic region with a conical ventral process ; a slight and entire 
rim running from each side of the dorsal fissure. Branchial plumes five on each side. Body 
of sixteen segments, the first and last unarmed, but with a pair of eye-specks on each. Two 
otocysts in second segment. Anterior region of eight bristled segments ; posterior of six. 
Body tapered a little posteriorly to end in a bluntly conical pygidium. Colour reddish green. 
Anterior bristles stouter than in Amphicora fabricia, with translucent, straight shafts, short 
tips and distinct wings. Posterior bristles long, hair-like and devoid of wings. Anterior 
hooks with long curved shafts, distinct shoulder and neck, stout, sharp main fang, and a 
moderately high crown, with two to three prominent teeth in lateral view above it. 
Posterior hooks short, with a long and minutely serrated anterior face above the main fang ; 
a short, sharp, curved prow, and a short, broad base, with a convex inferior margin. 
SYNONYMS. 
1864. Fabricia (Amphicorina) Armandi, Claparéde. Glanures Zoot., p. 36, pl. ii, fig. 2. 
1865. Oria Armandi, De Quatrefages. Annel., 11, p. 462. . 
INKS, g i Claparéde. Annél. Nap., p. 418. 
S72 ae a6 Marion. Compt. rend., t. Ixxiv, p. 1254. 
1 Oria was given by Hiibner in 1816 for one of the Lepidoptera, whilst Robineau-Devoidy 
bestowed the same title on one of the Diptera. 
