EUNICIDAE 133 



The jaws are small and rather dehcate. The carriers taper down to two fine points: 

 the dental formula is 8 — 8 : 9 + 5 — 7. 



In the same bottle with the specimens are three worm tubes : they have a very narrow 

 lumen and are made of a soft membraneous substance thickly coated with green mud. 



My specimens from off Cape Horn seem to correspond with Johnson's description 

 of his examples dredged at Victoria, British Columbia. The body measurements are, 

 however, different. Johnson gives 38 mm. by 3 mm. for 52 somites; my complete 

 specimen measures 72 mm. by i mm. without the feet for 170 segments. 



Omiphis elegans (Johnson), from an unknown locality, is very close to and perhaps 

 identical with this species. Chamberlin (1919, p. 295) separates them on the ground of 

 certain differences in the number of teeth in the jaw plates and in the shape of the teeth 

 of the pseudo-compound bristles, both of which characters are within certain limits 

 matters of individual variation. 



Eyes are present in O. elegans and absent in this species: this is, however, not always 

 a satisfactory specific character (v. Ehlers, 1887, p. 80). Omiphis holobranchiata, 

 Marenzeller, is also a closely allied species. This species also has eyes, the carriers of the 

 jaws are rounded at the ends and not pointed as in O. iridescens and the shape of the 

 teeth of the pseudo-compound bristles is different. 



Omiphis pallida (Moore) (191 1, p. 256) has the gill beginning on the 4th chaetiger, 

 and corresponds with my incomplete specimen in which the arrangement of the gills 

 is similar. It is probably identical with O. iridescens. 



Genus Leptoecia, Chamberlin 

 Leptoecia antarctica, n.sp. 



St. 177. 5. iii. 27. 27 miles SW of Deception Island, South Shetlands. 63° 17' 30" S, 61° 17' 00" W. 

 1080 m. Gear DLH. Bottom: mud and stones. Sixty specimens. 



Description. Ten specimens and about 50 tubes with an average length of 60 mm. 

 and a diameter of 2 mm. The tubes have stout and very resistant walls of mud, from 

 which it is difficult to extract the animal. The ten specimens free of their tubes must 

 have been removed from them by the collector probably while the animal was alive. 

 Most of the tubes contain a specimen. 



The largest specimen examined has 56 chaetigers and measures 33 mm. by 2 mm. 

 including the feet. The body is slender and flattened and in spirit there are no colour 

 markings. There are two globular palps, two ovoid anterior tentacles and five occipital 

 tentacles with short ringed ceratophores. The inner lateral tentacles reach back to the 

 6th chaetiger ; the median tentacle is about half their length and the outer laterals about 

 one-third. I can find no trace of eyes. The buccal segment is longer than the pro- 

 stomium and about equal in length to the following segment. It is not surpassed by the 

 ist foot. There are no tentacular cirri and no branchiae. 



The first three chaetigers (Fig. 50, a) have a cirriform posterior lip to the pedal lobe 

 and a tapering ventral cirrus, both of which decrease in size rapidly from before back- 



