GLYCERA LAPIDUM. 479 



Habitat. — St. Andrews Bay, three to four fathoms and between tide-marks in fissures 

 of rocks amidst sandy mud ; nine miles off Balta, fifty to sixty fathoms, J. G. Jeffreys, 

 1868; four to eight fathoms, Bressay Sound, Shetland; dredged south of Sark (epitocous 

 male). Polperro, on gravel (Dr. Baird). Lamlash Bay (Dr. Howden). Coast of Corn- 

 wall, twenty to twenty-three fathoms. In fifty fathoms Dingle Bay ; off Bundoran, 

 Donegal Bay, twenty to thirty-five fathoms, ' Porcupine,' 1869. In muddy sand at Station 

 III, < Porcupine,' 1870, Lat. 48° 31' N., Long. 11° 3' W., in 690 and 500 fathoms. 

 Stomachs of cod and haddock, St. Andrews (E. M.). Scottish Fishery Board, Station 

 LXVI. Trawled off Sark by Col. Fraser and Capt. Powell; thirty to fifty miles west of 

 Valentia, Ireland, in 90 — 125 fathoms (J. Gr. J.) ; fifty-three fathoms, ' Knight Errant,' 

 3rd and 4th August, 1880, Station III; 664 fathoms in the 'Porcupine' (Ehlers). 



Off Bergen, Norway (Canon Norman). In clayey mud in the Norwegian Fjords, 

 where O. F. Miiller early procured it. As G. setosa, surface of sea in Waigat Strait, 

 ' Valorous ' Expedition. Station III, ' Valorous,' twenty fathoms, shell-sand, 1875. 

 ' Valorous,' 1100 fathoms, 1875, Station VI. Shores of the North Atlantic. West coast 

 of North America (Ehlers). Off Fayal, Azores. Off Setubal. Mediterranean in 

 6 Porcupine ' Expedition of 1870, at Station XVII a in 795 fathoms, and thirty miles W. 

 of Cape Mondays, 100 fathoms; and at Station 50, Lat. 36° 14' N., Long. 17° 30' E., seven 

 to fifty-one fathoms. Mud and muddy sand, Bono Bay, twenty-five fathoms. On a sandy 

 bottom at Station XXX, in 386 fathoms, and with a bottom temperature of 53°, and in 

 forty-five fathoms eight miles N.W. of Cape Sagres, ' Porcupine,' 1870. 



Head with a tapering series of about eight segments, the terminal having four slender 

 tentacles. No sign of retractile palpi. 



Body 3 — 4 ins. long, 150—170 segments (Ehlers), slightly tapered anteriorly, and 

 more distinctly so posteriorly, rounded on the dorsal and somewhat flattened on the ventral 

 surface, diminishing to a slender tail, and terminating posteriorly in two small cirri. 

 Each segment has three distinct rings, the median being more elevated than the anterior 

 and posterior. In section, besides the neural canals at the upper border of each 



nerve several smaller (branches) exist near the middle line below it. Groups of nuclei 

 occur in the sheath, especially externally. The cords lie at the outer border of the area. 

 The apex of the triangular nerve-area is occupied between the ganglia by a fibrillar 

 neurilemma with nuclei externally. 



Colour of a small example translucent yellowish-white, opaque along the gut. 

 Ventrally the double nerve- cord is visible through the skin, and is pinkish anteriorly, 

 where it is dilated, and a pink patch also appears both dorsally and ventrally in front 

 of the ganglia. The nerve-cord is pale posteriorly. The four black jaws are seen 

 through the transparent skin. The intestinal canal is straight—pale behind the jaws and 

 dilated for some distance, then brownish to the tail. The lines of the segments have a 

 clear patch on each side. Some are slightly pinkish. 



Internally active ciliary motion at the base of the feet, probably in connection with 

 the segmental organ, and it did not extend into the foot. The peritoneal corpuscles 

 have projecting processes like a bread-fruit. In section the gut has a thick layer of 

 longitudinal muscular fibres under the peritoneal or coelomic investment, and this 



