ORIA ARMANDI. | 269 
1875. Oria Armandi, Panceri. Atti Soc. Ital., vol. xviii, p. 533. 
a i Marion and Bobretzky. Ann. Sc. nat., 6° sér., t. 11, p. 90. 
UO, 95 x Langerhans. Zeitschr. f. wiss. Zool., xxxiv, p. 116, pl. v, fig. 30. 
NER, oy a Carus. Fauna Medit., 1, p. 273. 
SOAs _ De St. Joseph. Ann. Sc. nat., 7° sér., t. xvu, p. 321, pl. xu, fig. 348. 
UNO; 65 53 Elwes. Journ. M. B. A., vol. ix, p. 65. 
OAs - Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 141. 
QIN, = Allen. Journ. M. B. A., vol. x, p. 643. 
3 Me MS Southern. Irish Se. Invest., No. 3, p. 49. 
IWOMN@ 95 a McIntosh. Ann. Nat. Hist., ser. 8, vol. xvi, p. 26. 
ION, Oreche 9 Rioja. Anél. Poliq. Cantab., p. 73. 
Habitat —Not uncommon amongst the growths on Balani in the Gouliot Caves, Sark ; 
Torquay in rock pools, and Newquay, Cornwall (Elwes); Blacksod and Clew Bays (Southern). 
Elsewhere it occurs amongst Rytiplea pinastroides on the Coast of Dinard (De St. Joseph) ; 
the Mediterranean (Claparéde, Panceri, Marion and Bobretzky); Atlantic; Madeira 
(Langerhans) ; Shores of Cantabria (Rioja). 
Claparéde (1864) describes a ventral cephalic collar in this species, apparently as dis- 
tinguished from Amphicora fabricia, but so far as observed in the spirit-preparations there 
is not much difference in this respect—both presenting a conical ventral prolongation, and 
a narrow rim to the dorsal fissure. Claparéde states that below the collar is a row of vibratile 
cilia. Immediately in front of the termination of the collar on the latero-dorsal region is 
an eye-speck on each side. The second segment bears a statocyst on each side, viz. a capsule 
with a statolith. The branchie are similar in general appearance, in two groups of five 
(Claparéde). They are ciliated internally and have palpocils externally. The first ventral 
branchia is reduced to a simple filament without pmne. A single vessel occurs in each 
filament, and it ends blindly where the cilia cease. 
The body (Plate CXV, fig. 3) of the examples from Sark is not larger than that of Amphi- 
cora fabricia from St. Andrews, the advantage in size indeed being with the northern form, 
which is also more translucent. The eyes had disappeared in the preparations (after forty-two 
years), and yet, as Claparéde shows, those of A. fabricoa are permanent in spirit. The number 
of segments is at once diagnostic, for Oria Armand has fourteen bristled segments besides 
the first and last. Claparéde, however, gives nineteen to twenty segments, though he found 
a ripe female with fewer than twelve segments. The first segment is achetous. At the 
tenth segment the bristles change to the ventral border and the shape alters. 
The digestive system has a cylindrical colourless cesophagus, and from the third segment 
the gastro-intestinal canal proceeds backward as a brownish, wide tube. A blood-vessel 
runs on each side of the canal with a transverse branch in each segment; indeed, the gut 
is surrounded by a vascular rete (Claparéde). In the seventh segment a pair of folded tubular 
organs (segmental ?) occur. 
Fourteen pairs of bristle-bundles characterise those from Sark. The anterior bristles 
(Plate CX XIX, figs. 5 and 5’) have stouter shafts than those of Amphicora fabricia, and the 
tapering tip is shorter, and has wider wings. Hight pairs belong to the anterior and six to 
the posterior region, the latter (Plate CX. XIX, fig. 5a) being distinguished by their slender- 
ness and the tenuity of their hair-like tips, as well as by the absence of wings. Moreover, 
