48 8 GLYCERA ALBA. 



1894. Glycera convoluta, De St. Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 27, pi. ii, f. 30—38. 



1897. „ alba, Arwidsson. Bih. Vet.-Akad. Handl., Bd. xxiii, p. 14, Taf. i, f. 11—13. 



1898. „ „ De St. Joseph. Ann. Sc. hat., 8 e ser., t. v, p. 344. 



convoluta, Gravier. Compt. Rend. Ac. Sc, t. 126, p. 973. 

 1901. (?) „ Goesl, Hornel. Trans. Biol. Soc. Liverp., vol. v, p. 244. 



1904. „ convoluta, Allen. Journ. M. B. A., n.s., vol. vii, p. 226. 



1905. „ alba, Mcintosh. Ann. Nat. Hist., ser. 7, vol. xv, pp. 42, 50, and 56. 

 » » G-raeffe. Arbeit. Zool. Stat. Triest, xv, p. 323. 



convoluta ( = G. retractilis, De Qnatref.), idem. Ibid., p. 323. 

 1906 - „ „ Bohn. Ann. Sc. nat., 9 e ser., t. iii, p. 109. 



Habitat. — Coast of Wales and Cornwall (Baird and Laughrin) ; Polperro ; Plymouth. 

 Stomach of flounder and haddock, St. Andrews and West Sands after storm (E. M.), and 

 dredged off B. Rocks. Outer Haaf, Skerries, Shetland, in seventy fathoms, 1868 ; nine 

 miles off Balta, fifty to sixty fathoms, 1868 ; eighty fathoms, St. Magnus Bay, Shetland, 

 1867 (J. G. J.). Bressay Sound, four to eight fathoms. CumbraB (Kolliker). In 165 

 fathoms in muddy sand off Ireland, < Porcupine,' 1870. Thirty to forty fathoms, Dingle 

 Bay, Ireland, ' Porcupine,' 1870. Off Bundoran, Donegal Bay, ' Porcupine,' 1869. Ken- 

 mare River, Roy. Irish Acad., 18th August, 1890. Station III, ' Knight Errant,' 3rd and 

 4th August, 1880, fifty-three fathoms. Dredged in twenty-four fathoms off the Bass 

 Rock, Firth of Forth (Mobius). Southport Sands, near low water-mark in company with 

 Sulcator arenarius and other forms. 



Forty-five fathoms off Cape Sagres, and off Cape Guardia, 'Porcupine,' 1870. North 

 Sea. Faroe (Willemoes, Suhm). Japan Sea (Moore, etc.). N. America? (Levinsen). 



Head typical, with eight segments, the tapered tip having four short tentacles. 



Body of considerable length, viz., 6 — 8 ins. or more, slightly tapered in front, more 

 distinctly attenuated posteriorly. It is rounded dorsally, somewhat flattened ventrally, 

 and marked on each surface by a median line. The segments are well defined, and 

 consist of two rings, that from which the foot comes off being slightly the broader. 

 Posteriorly the body is flattened, and ends in a pair of slender cirri. In section the 

 main and subsidiary neural canals are distinct, the latter being somewhat larger than 

 usual. 



Proboscis. — In extrusion the organ is short and clavate, with numerous longitudinal 

 strise, besides transverse wrinkles behind the teeth at the tip, a definite fold marking off 

 this region from that bearing the teeth. The papillae are small and clavate (Plate LXV, 

 fig. 1), the tip generally presenting a pale ovoid area from pressure. They seem to be 

 somewhat smaller on the transversely wrinkled distal region. The teeth occupy elevated 

 bosses symmetrically arranged in the extruded organ, the mouth being in the centre of 

 a four-lobed area, each lobe passing between the teeth. 



In section the body -wall shows more massive dorsal longitudinal muscles, which have 

 only a slight incurvation at the lower edge, and thus they are in contrast with those of 

 G. lapidum. The ventral longitudinal muscles, however, are similarly developed, and 

 meet over the small nerve-area inferiorly to a greater extent than in either of the other 

 forms mentioned, only a narrow pedicle passing upward at the ganglia. The circular 

 muscles, as in the others, are powerfully developed. A conspicuous transverse muscle 



