LAPHANIA BCECKI. 163 



and separated from the vent by a groove. Body slender, somewhat enlarged in front, 

 gently tapered to the posterior end, where the segments are longer. Seventeen pairs of 

 capillary bristles, commencing on the third segment. The smooth bristles have winged 

 tips, and some with shorter tips are almost geniculate. Avicular hooks commence on the 

 seventh (Hessle ninth) setigerous segment in a single row; then a double row between 

 the eleventh and twentieth, continue to the posterior end, and show four teeth above 

 the main fang. Distinct ventral scutes. Anterior nephridia reduced, the first of the 

 posterior in the fifth segment, and opening through the diaphragm, the rest nearly 

 equally developed, with long tubes. 



1. Laphania bcecki, Malmgren, 1865. Plate CXXVI, figs. 4 — 4 6 — bristles and hooks. 



Specific Characters . — Cephalic lobe as in the genus ; buccal segment somewhat 

 elongated 1 ; the second the largest, and separated from the third by a groove and 

 sometimes a ridge. Body 50 — 70 mm. long, and fifty segments, enlarged in front, and 

 gently tapered to the posterior end ; about two inches or more in length. It is rounded 

 dorsally in front, but by-and-by the lateral regions form prominent fillets which cause a 

 moniliform condition posteriorly. About ten to twelve conspicuous ventral scutes. Tail 

 unknown. Bristles on seventeen segments, pale golden, with tapering, winged tips, 

 those with shorter tips being winged and almost geniculate. Hooks avicular with four 

 teeth above the main fang in lateral view. Nephridia in the fifth, sixth, seventh and 

 eighth segments, a rudimentary one (Fauvel) between the third and fourth segments. 

 Tube of mucus and sand. 



Synonyms. 



1865. Laphania Boecki, Malmgren. Nord. Hafs. -Annul., p. 886. 



1867. „ „ idem. Annul. Polych., p. 110, Tab. xii, fig. 68. 



1873. „ „ Willemoes-Suhm. Zeitschr. f. wiss. Zool., Bd. xxiii, p. 349. 



1883. „ „ Levinsen. Vidensk. Meddel. nat. For. Kj/zfbenhavn, p. 178. 



1893 ?. Amsea trilobata, Lo Bianco. Atti R. Accad. Sc. Nap., vol. v, No. 11, p. 60. 



1894. Laphania Boecki, Bidenkap. Christ. Vet.-Akad. Handl., p. 131. 



1899. „ „ Ssolowiew. Ann. Mus. Zool. Acad. Imp. St. Petersburg, t. iv. 



1912. „ „ Ditlevsen. Danmark Eksped. Grronl., Bd. v, p. 428, pi. xxix, figs. 10 — 15. 



„ Wollebeek. Vidensk. Skrift. Krist., 1911, p. 108, pi. xxiii, figs. 1—5. 

 1915. „ „ var. hystricis, Mcintosh. Ann. Nat. Hist., ser. 8, vol. xv, p. 25. 



1917. „ „ Hessle. Zool. Bidr. Uppsala, No. 5, p. 204. 



Habitat. — Dredged off Shetland by Dr. Gwyn Jeffreys in 1867 ; " Porcupine " Expe- 

 dition, 1870, Station I (Entrance to British Channel), in 567 fathoms. 



Abroad it is found in the Gulf of St. Lawrence, Canada (W. C. M.) ; Finmark 

 (Malmgren) ; Greenland (Ditlevsen, Hessle) ; White Sea (Ssolowiew). 



The cephalic lobe is so developed that at first sight this form has some resemblance 

 to a Maldanid. The dorsal collar, however, is present, and the plate passes obliquely 

 forward to make a fairly firm arch over the mouth. From the surface of the plate spring 



1 As Long as the three following (Hessle). 



