TPICHOBPANCHUS GLACIALIS. 207 



m Loch Portan in the same locality is noteworthy, as the water there has a considerable 

 admixture of fresh water. St. Magnus Bay, Shetland, in 80 and 100 fathoms; in 

 90 fathoms 25 miles west of the Blasquet, S.W. Ireland (J. G. Jeffreys), 30-40 fathoms 

 in Dingle Bay, Ireland, " Porcupine," 1869. At 690 fathoms in the Atlantic, No. 3, 

 " Porcupine," 1870 (small); 358 fathoms in the Atlantic Station No. 6 in the same 

 expedition; W. Coast Ireland, Clew Bay, etc. (Southern). 



It elsewhere occurs off Bergen, Norway (Canon Norman, Wollebsek) ; Greenland 

 (" Valorous," and Michaelsen) ; Spitzbergen (Fauvel) ; Sweden (Malmgren and Hessle) ; 

 shores of France (De St. Joseph) ; Canary Islands and Madeira (Langerhaus) ; Magellan 

 and Antarctic Seas (Ehlers); Mediterranean; Atlantic Coast of America (Webster and 

 Benedict) ; White Sea (Ssolowiew). 



Caullery found none in the collections of the Siboga Expedition. It also occurs at 

 the South Pole. 



The cephalic lobe differs from that of Poli/cirrus in its reduced condition. Dorsally 

 it has a groove separating it from the first segment, and is provided with two eye-spots, 

 the lobe then projecting forward as two symmetrical rounded bosses flanked on each side 

 by a translucent free flap. From the surface springs a dense series of tentacles, filiform, 

 and fusiform. The filiform are pale pink in colour, and like the larger clavate, grooved, 

 red-streaked tentacles, keep up a continuous movement. The translucent lateral flaps are 

 devoid of tentacles. The distinction between the three groups of appendages is distinct 

 in some preparations. The branchiae are coiled, the posterior small tentacles filiform, 

 whilst the larger are clavate and grooved. The mouth opens in the centre above a line 

 joining the attachments of the translucent lateral flaps and in a groove between the two 

 prominent anterior bosses. 



The body (Plate CXV, figs. 5 and 5 a) is terebelliform in appearance, about an inch 

 in length, enlarged anteriorly and tapered posteriorly to terminate in an anus with two 

 cirri. It is rounded dorsally, grooved ventrally, and has about seventy segments. The 

 mouth opens anteriorly at the furrow between the bosses, the translucent lateral flaps 

 curving inward to be attached on each side. Ventrally is the tumid and streaked Jower 

 lip which forms the conspicuously truncated anterior end. The grooves generally show 

 a symmetrical arrangement, a broad median belt passing down the centre, flanked by two 

 or three stripes on each side, the ventral end being split. The second segment forms a 

 continuous ring dorsally and ventrally, and sometimes projects forward dorsally so as 

 to ensheath the posterior cephalic edge and the eyes. It bears dorsally the first 

 branchia, on each side — a single thick and proportionally long filament tapered distally, 

 distinguished by the bright red central vessel and often by the spiral condition. The 

 third and fourth segments also bear a pair of gills, which readily fall off in the prepara-, 

 tions. The general colour is blood-red, darker anteriorly, paler posteriorly. The lip is 

 rich red, whilst the lateral flaps are translucent. The coelomic corpuscles (and ova r) are 

 pale red, and appear through the transparent skin as they roll about. A red blood- 

 vessel runs along the centre of the ventral surface. 



Tlie short setigerous processes, which have oblique tips, commence on the sixth 

 segment, and are fifteen in number. Each tuft has two series, a longer and a shorter (Plate 

 CXXVII, figs. 4 and 4 a). The larger bristles are pale golden, one half more or less free 



