390 LUMBRICONEREIS (ZYGOLOBUS) LAURENTIANUS. 



Genus LXIV. Zygolobus, Grube, 1863. 



Head a blunt (rounded) cone. The anterior margin of the buccal segment bears two 

 bosses which dorsally overlap the cephalic lobe. Proboscis, body, and bristles as in 

 LumbriconereiSj with which this probably should be united. 



Ehlers insisted that Grube's genus Zygolobus should be included in Lumbriconereis, the 

 two swellings of the first segment, in his opinion, not sufficing for distinction. 



Lumbriconereis (Zygolobus) laueentianus, Grube, or n.s. ? 1863. Plate LXII, figs. 6-6 b — 

 head and teeth; Plate LXXXII, figs. 8-8 c —bristles. 



Specific Characters. — Head a short cone, with two prominent dorsal bosses in the 

 middle line posteriorly. Body 7 — 9 ins. in length, and fully 3 mm. in breadth, with the 

 general aspect of a Lumbriconereid, and finely iridescent. Foot with a well-marked conical 

 setigerous lobe having black spines (four or five in number), strong winged simple bristles 

 with a marked curve at the distal end of the shaft above the spines, a more slender 

 group with a different curve distally below the spines, and long winged hooks which 

 anteriorly (twentieth foot) have a narrow and elongated distal region, but posteriorly this 

 becomes shorter and more rounded in outline. The distal end has a narrow neck for the 

 hook, the chief fang of which is of moderate size, and the crown above it has four or five 

 minute spines. 



The Liimbriconereis mucronata of Ehlers, 1 from the mouth of the Congo, has an 

 elongated prostomium, but this is more lanceolate than acutely tapered, and the hooks of 

 the two diverge. 



Synonyms. 



1863. Zygolobus laurentianus } Grube. Arch. f. Naturges., xxix, p. 40, Taf. ix, f. 3 and 3a. 

 1865. „ „ De Quatrefages. Annel., i, p. 382, and ii, p. 652. 



1874. Liimbriconereis laurentiana, Mcintosh. Ann. Nat. Hist., ser. 4, vol. xiv, p. 199. 



1875. „ „ idem. Invert, and Fishes St. Andrews, p. 123. 

 1885. „ breviceps, Cams. Fauna Medit., p. 215. 



Habitat. — Procured in the stomach of cod and haddock from St. Andrews Bay 

 (E. M.). 



Prof. Lorenz sent it to Prof. Grube from St. Martino in Lussin Piccolo, in the 

 Adriatic. 



Head (Plate LXII, fig. 6) a short cone, and distinguished by the two prominent 

 bosses in the middle line posteriorly. 



Body probably 6 or 7 ins. or more in length and fully 3 mm. in breadth in the prepara- 

 tion. The general aspect is that of Liimbriconereis, and it has a finely iridescent cuticle. 

 So far as the preparation shows, a single segment about twice the breadth of the others 

 follows the head, but there are indications of two segments, as Grube says, the broader 



1 ' Deutsch. Tiefsee Exped./ p. 95, Taf. xii, figs. 9—13. 



