NEPHTHYS HYSTRICIS. 27 



Dr. H. Theel (1879) criticises under this species Malmgren's figures of the feet, 

 since he did not accurately compare the same feet in each species, or at least from the 

 same region of the body. 



Tauber (1879) includes Nephthys cirrosa, Ehlers, and probably N. lactea, Malmgren, 

 under this species. 



Shepotieff describes and figures the bristles and bristle-sacs with their muscles x — his 

 careful investigations being made chiefly on sections of the parts. 



4. Nephthys hystjbtois, Mcintosh, 1900. Plate LVII, figs. 8, 9 ; Plate LXVI, figs. 10 and 



10 a — feet. 



Specific characters. — Head elongated from before backward, with rather pointed 

 subulate tentacles anteriorly, the broader second pair following after an interval. 

 Peristomial segment ventrally with two broad flaps and a symmetrical series of furrows. 

 Body resembling that of N. ciliata. Proboscis comparatively short, with slender papillae 

 in twenty-two rows. The mid-dorsal pair converge on the long tentacle immediately in 

 front, and the rows on each side of the mid-ventral line converge in a more marked 

 manner, but there is no median filament. As a rule, four papillaB occur in each row, but 

 in some traces of a fifth are seen, and in the ventral pair (on each side of the median 

 line) are six short papillaB. Foot with a long, little elevated, dorsal lamella, which does 

 not extend so far outward or droop at the tip, as in N. Hombergii. It also approaches in 

 form that of N. ciliata, but differs in the shape of the dorsal lamella, and in the fact that 

 in front of the capillary bristles the spinigerous region forms a low cone with the spine at 

 the apex, the barred bristles arising in the fissure between it and a large flap or lamella 

 formed by the fillet guarding the bristles, whereas in N. ciliata the spinigerous region 

 itself forms the free flap. The dorsal cirrus is somewhat thick, separated only bv a 

 shallow notch from the branchia, which is of moderate size, has a papilla at its outer 

 base, and is curved outward. Bristles similar to those of N. Hombergii, but thinner. 

 Inferior division of the foot with a small lamella posteriorly, another nearly as prominent 

 formed by the fillet for the barred bristles, the conical spinigerous lobe lying between. 

 In several views, therefore, the tip is trifid. 



Synonyms. 



1900. Nephthys hystricis, Mcintosh. Ann. Nat. Hist., ser. 7, vol. v, p. 259. 



1901. „ „ idem. Ibid., vol. viii, p. 222. 



1902. „ „ Marenzeller. Polych. Grand., p. 14. 



Habitat. — Dredged in the 'Porcupine' Expedition of 1869, 110 fathoms; 370 

 1 'Zeitsch. f. wiss. Zool./ Bd. lxxvii, p. 593, Taf. xxvii, f. 5—17, 1904. 



