KEPOET ON THE ANNELIDA. 
459 
of the winged region, and the more attenuate condition of the bristle, the compara- 
tive differences being represented in PI. XXVIIa. figs. 29 and 30, the former being a 
bristle from Pista cristata, the latter from the present species. 
The shape of the hooks (PI. XXVIIa. fig. 31) diverges from that in Pista cristata in 
the dorsal and posterior curves, in the smaller space beneath the great fang, and in the 
attachment of the arm. The latter seems to have a thinner expanded base, by which it 
becomes continuous wdth the base of the hook. There are three distinct teeth in profile 
above the great fang, and a trace of a fourth. 
In the greyish mud of the alimentary canal are Diatoms, small Glohigerince and other 
Foraminifera, Eadiolaria, and an occasional fragment of a sponge-spicule. Numerous 
bodies like Coccoliths are also present. 
The tube consisted of a tough lining coated externally with fine brownish-grey mud. 
Comparatively few Diatoms and sponge-spicules occurred amongst the latter, the chief 
organic structures being the tests of arenaceous Foraminifera. 
Eupista clarwini, n. sp. var. (PI. XXVIIa. fig. 32). 
Habitat. — A softened fragment closely approaching the foregoing was trawled at 
Station 63 (Mid Atlantic, between the Azores and Bermuda), June 19, 1873; lat. 35° 29' N., 
long. 50° 53' W. ; depth, 2750 fathoms ; surface temperature, 7l°'0 ; sea-bottom, red clay. 
The characters of the cephalic region of the fragment are indistinguishable, and the 
branchiae are absent. The bristles agree with those of Eupista darivini in being longer 
and more slender than those of Pista cristata. The hooks (PI. XXVIIa. fig. 32) exhibit 
a slight modification in the straightness of the dorsal line, and in the greater elevation of 
the crown when contrasted with those of Eupista darwini. The space below the great 
fang is also somewhat smaller. 
Sufficient materials, however, are not at hand to establish a reliable distinction, if 
such exist. 
Attached to the posterior region was the small rounded body of a Crustacean parasite 
with an ovoid mass of eggs in a hyaline sheath. Beyond the presence of a chitinous 
investment, and traces of segmentation, little could be made out in the injured example. 
In simplicity of structure it resembled the Troplioniphila ^sausitic, on Trophonia wyvillei.^ 
Eupista grubei, n. sp. (PI. XLIX. figs. 6,7; XXVIIIa. fig. l). 
Habitat. — Trawled at Station 325 (in the Atlantic, in a line off the Rio de la Plata), 
March 2, 1876 ; lat. 36° 44' N., long. 46° 16' W. ; depth, 2650 fathoms ; bottom tempera- 
ture 32°'7, surface temperature 70°'8 ; sea-bottom, blue mud. 
' Vide, p. .368. 
