LAGIS KORBNI. 49 



1. Lagis Koreni, Malmgren, 1867. Plate CXII, fig. 2 — entire animal from life; 

 Plate CXVI, fig. 7 and 7 a— portions of pelagic tube ; Plate CXVIII, fig. 6— 

 anterior end and tube ; Plate CXXIV, figs. 3 — 3 c — paleao, bristles and hooks ; 

 Plate CXXXVI, fig. 21— nuchal organs. 



Specific Characters. — Crown with fifteen paleolae, 1 flattened, hollow, tapering to a 

 delicate tip, often curved or coiled, and the concavity of the curve minutely crenulate as if 

 from thinner tissue. The dorsal surface of the crown is firm, glabrous, with a smooth rim 

 which passes ventrally to end in a subulate cirrus or tentacle. A notch separates the 

 latter from the veil, which is rather broad and has anteriorly a series of long papilla or 

 fimbria. A firm, transversely elongated area separates the veil from the paleolas, and 

 the edges of the veil form a guard to the tentacles which are attached to its base. The 

 second cirrus arises in front of the branchiae, and a ridge passes from it on each side to a 

 central boss. Branchias two in number, with a long coiled basal stem and lamellae 

 which diminish from within outward; under the last a small lamella 3 (Hessle). Body 

 from 1J to 2 inches in length, gently tapered to a comparatively broad tail, which has an 

 appendix rounded vertrally, flattened and grooved dorsally, where there is a valve to the 

 anus, and with pale papillae along its sides. Caudal appendix usually curved ventrally, 

 though in the tube it may be straight. It is shaped like a Mysostomam, with a concave 

 transversely striated dorsal surface resembling a sucker surrounded by a rim which is 

 notched and papillose; ventral surface convex and obliquely striated. Caudal hooks 

 (dorsal) with short, stout striated shafts and acutely curved tips. Anal cirrus club-shaped 

 (Hessle). 



Bristled segments fifteen. Behind the branchiae are three bristled segments without 

 hooks, forming the first region; then the succeeding division has twelve largely developed 

 lamellae for the hooks, with bristles dorsally. The bristles are stout, pale and golden, 

 with finely tapered though rather stiff tips with traces of wings, and others which have a 

 spear-tip flattening with a serrated edge distally followed by a long tapering hair-like tip. 

 Hooks (which are on twelve segments) have a short horizontal shaft, a rounded crown 

 and six teeth along the front edge in lateral view ; beneath these is a tooth-like process 

 minutely spinose, and then the keel shows a convexity, a hollow and a small knob at 

 the edge. Caudal hooks generally four, of which three project. Tube slightly curved 

 and tapering, neatly formed of sand-grains showing exquisite masonry. 



Synonyms. 



1731. Solen fragilis, Klein. Tab. mar., p. 21, t. xv. 



1819. ? Cistenia pallasii, Leach. Ency. Brit. Suppl., p. 452, pi. xxvi. 



1836-48. Amphitrite auricoma, M. Edwards. Cuvier Kegne Anim., edit. Planches., Tab. vi, fig. 1. 



1 Hessle gives twelve. 



2 Two cement-glands (fourth to sixth segments) opening between the second branchia and 

 the first bristle-tuft (Hessle). 



176 



