328 PRAXTLLELLA PRJETERMISSA. 



1883. Glymene prtete 



1885. Praxilla 



1886. Glymene , 

 1894. 



1904. Praxillella 

 1906. Praxilla 



„ Praxillella 



1909. 



1913. Glymene 



>) a 



Praxillella 



nnissa, Levinsen. Vidensk. Meddel. Nat. For., p. 144. 

 Cams. Fauna Medit., p. 252. 

 Levinsen. Kara-Havets, etc., p. 10. 

 Bidenkap. Christ. Vid.-Selsk. Fork., p. 113. 

 var. capensis, Mcintosh. Marine Invert. S. Africa, vol. iii, p. 75. 

 Augener. Westind. Polych., p. 162. 

 Arwidsson. Skand. u. arktisch. Maldan., p. 192, Taf. iv, figs. 136 a- 



143, Taf. ix, figs. 294—296, Taf. xii, figs. 361—363. 

 Fauvel. Bull. Inst. Ocean., 142, p. 11. 

 Moore. Proc. U. S. Nat. Mus., vol. 37, p. 142. 

 Mcintosh. Ann. Nat. Hist., ser. 8, vol. xi, pp. 103, 113, 119, 128. 

 var., idem. Ibid., p. 116. 



Nolte. Wiss. Meeresuntersuch., n.f., Bd. xv, p. 43, Taf. 1, figs. 14—16. 



Habitat.— OS the Hebrides in 1866 ; Outer Haaf, Skerries, in 70 to 80 fathoms ; St. 

 Magnus Bay, 100 fathoms; 30 miles west of the Blasquet, S.W. Ireland; 90 fathoms off 

 North Unst (J. G. Jeffreys) ; dredged in Ardmaddy Bay, Lochmaddy, 1865 (W. C. M.) ; 

 off St. Andrews Bay (E. M.). 



Abroad it was procured by the ' Porcupine ' Expedition of 1869 in 358 fathoms at 

 Station 8, and at 17 a 9 miles off Cape Finisterre ; and in 1870 at various stations, e.g. off 

 Cape Guardia. It abounds on a bottom composed of reddish sand in the Gulf of St. 

 Lawrence, Canada (coll. Dr. Whiteaves) ; shores of Norway, Sweden and Finmark 

 (Malmgren) ; Nova Zembla, Spitzbergen, Greenland (Arwidsson) ; South Africa (W. C. M.) ; 

 Marseilles (Marion) ; Siberian and Behring Seas (Wiren) ; 300 fathoms off Norway 

 (Sars) ; Atlantic coast, U.S.A. (Verrill) ; Kara-Havets (Levinsen); West Indies 

 (Augener), 



The cephalic plate is sloped from above downward and forward, and has a median 

 ridge from its posterior to its anterior border, where it ends in a flattened conical process 

 which curves forward and slightly upward. The rim of the plate has a median notch 

 posteriorly, a deep lateral notch a little more than a third of the distance forward, 

 whilst its edge is rounded off on each side of the anterior median process. The rim in 

 small examples has an entire margin throughout, but in large forms a series of notches, 

 about five in number on each side, cut the border between the lateral notch and the 

 median posterior into serrations. The deep part of the rim is the anterior section on 

 each side. The nuchal grooves occur on each side of the median ridge — widening a little 

 in their passage forward as they run into the notch or angle at the base of the median 

 process. The mouth opens as a transverse slit on the ventral surface a little behind the 

 median process of the cephalic plate, and occasionally the proboscis is extruded as a 

 flattened button covered with small reniform papilla, or in full extrusion as an ovoid sac 

 or bladder. 



The body is of moderate length, more or less rounded throughout, thicker in front 

 and diminished toward the anal funnel, the posterior region, moreover, being for nine or 

 ten segments moniliform. A median streak marks the ventral surface, which, further, 

 is in parts somewhat less rounded than the dorsal. There are nineteen bristled segments, 

 and four without bristles posteriorly. 



The fused pro- and peristomium form a thickened mass— broad in front and con- 



