NEPHTHYS GEUBEL 33 



6. Nephthys Gettbei, 1 Mcintosh, 1900. Plate LVII, figs. 13 and 14; Plate LXVII, 

 fig. 1— feet; Plate LXXVI, figs. 9 and 9 a— bristles. 



Specific Characters. — Head elongated from before backward, with a straight anterior 

 edge, which is somewhat narrower than in JV. longisetosa ; tentacles at the outer border, 

 conical, tapering, with a translucent area at the base internally. Second pair follow close 

 on the first, and have the form of an acuminate leaf, whereas in JV. longisetosa they are 

 further removed from the first, as well as proportionally longer and more pointed. 

 Distinct papilla, probably sensory (nuchal organ), at each posterior angle of the head. 

 Proboscis included, but the arrangement of the parts around the mouth is similar to that 

 of JV. longisetosa. First foot diverges from that mentioned in the presence of a subulate 

 dorsal process or cirrus, besides the lanceolate ventral one. The typical foot has the 

 dorsal lamella narrowed at its attachment, broader and somewhat truncated distally, the 

 reverse occurring in JV. longisetosa. Instead of a distinct flap externally there is only a 

 trace in the shape of a fillet. Dorsal cirrus less, branchia longer than in that species and 

 curved inward. Pointed spinigerous lobe produced further outward, and at a different 

 angle: fillet guarding bristles convex upward. In the inferior division the posterior 

 lamella smaller, spinigerous lobe longer and more acute, whilst anteriorly the upper 

 fillet is smaller. Ventral cirrus smaller and less tapered. Both barred and capillary 

 bristles are more slender than in JV. longisetosa, though in both the transverse bars of 

 the serrated bristles extend downward till the full diameter of the shaft is reached. 



Synonym. 

 1900. Nejohthys Grubei, Mcintosh. Ann. Nat. Hist., ser. 7, vol. v, p. 260. 



Habitat.— Dredged at Station 8 by the ' Knight Errant,' 17th August, 1880, in 

 540 fathoms. 



The head (Plate LVII, figs. 13 and 14) is elongated from before backward, with a 

 straight anterior edge which is somewhat narrower than in JV. longisetosa. The tentacles 

 at the outer angle are conical, tapering, and have a translucent area at the inner border. 

 The position of the second pair differs from that in JV. longisetosa, for they follow 

 inferiorly close on the anterior pair, and have the form of an ovate acuminate leaf; 

 whereas in JV. longisetosa they are separated by a considerable space from the anterior 

 pair, and they are proportionally longer and more pointed. At each angle of the head 

 posteriorly is a conspicuous papilla, probably a sense-organ (nuchal organ), the corre- 

 sponding organ in JV. longisetosa being inconspicuous. The lips inferiorly (Plate LVII, 

 fig. 14) somewhat resemble those of N. Hombergii, but have a more acute filament. 



The proboscis is included. 



The first foot differs from that in iV. longisetosa, for it has a well-marked subulate 



1 Named after Professor Adolpli Edouard Grube, of Breslau, than whom no more earnest 

 student of the Annelids existed in his day. 



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