i 92 DISCOVERY REPORTS 



placed it in Krohnia Quatrefages, 1865, which genus has only simple chaetae. Clearly the species 

 must be included in Rhynchonerella, which it approaches in having compound chaetae, in its cephalic 

 appendages and in having an appendage on the pedal lobe. I have re-examined the specimens 

 described by Monro (1930) as R. fulgens (B.M.(N.H.), Reg. no. 1930.10.8.905/906:912), from Sts. 

 SS 33 and SS 53, and consider them to be R. bongraini. This misinterpretation was clearly due to the 

 small size in R. bongraini of the pedal appendage, which is exceedingly difficult to see, because it 

 can be hidden behind the large pedal lobe. All the material reported by Hardy and Gunther (1935) 

 as alciopid larvae is not available for examination, but it is almost certain that they were dealing 

 entirely with R. bongraini. 



General distribution. R. bongraini is known only from the Antarctic Zone where it appears to be con- 

 fined to the Antarctic Surface Water and the upper layers of the Warm Deep Water (see pp. 218-223). 



Rhynchonerella angelini (Kinberg) 1866 

 Type locality. China Sea, 20 S., 107 E. 



Krohnia Angelini Kinberg, 1866, p. 242. 



Rhynchonerella Angelini Greeff, 1876, p. 57. 



Callizona Grubei Greeff, 1876, pp. 72-3, pi. 5, figs. 63-6, pi. 6, figs. 69-88. 



Callizona Grubei Levinsen, 1885, p. 333, fig. 13. 



Callizona Angelini Apstein, 1900, pp. 18-19, pi. 4, figs. 33-8. 



Callizona Angelini Reibisch, 1905, pp. 4-5, figs. 7-8. 



Callizona Angelini Southern, 191 1, pp. 4-5. 



Callizona Angelini Fauvel, 1916, pp. 68-9. 



Callizona Angelini Fauvel, 1923, p. 215, fig. 81 d-i. 



Callizona angelini Monro, 1930, p. 82. 



Callizona Angelini Fauvel, 1932a, p. 17. 



Callizona angelini Monro, 1936, p. 118. 



Callizona angelini Wesenburg-Lund, 1939, pp. 41-2. 



Rhynchonerella Angelini Stop-Bowitz, 1948, pp. 34-6. 



Description. The largest specimen examined measures 67 mm. in length by 6 mm. wide across the 

 tips of chaetae. Two pairs of very short but broad, almost dumpy, antennae are situated on a pro- 

 stomial extension in front of the eyes ; a single unpaired cirriform antenna occurs dorsally between the 



eyes. The five pairs of tentacular cirri are arranged thus 1 -\ 1 — ; the unpaired and two ventrals are 



short, the two dorsals long and conical. Over the anterior three-quarters of the body the parapodia 

 have broadly foliaceous dorsal cirri which become elongate posteriorly; smaller, but still large, 

 foliaceous ventral cirri; pedal lobes, each with a prominent cirriform appendage carrying two types 

 of compound chaetae, an inferior group, short stout acicular bristles with short smooth terminal 

 articles and a superior group with long smooth articles: the acicular bristles decrease in number 

 posteriorly. In the last one-quarter of the body the overall width is gradually reduced to a minimum 

 of 0-25 mm., and the body assumes an appearance which Wesenberg-Lund (1939) described as a 

 ' whip-cord like tail '. Parapodial cirri are here considerably reduced in size but never entirely dis- 

 appear, and chaetae though smaller are still present. Pigmented segmental glands are present on 

 all feet. The proboscis is terminated by twelve small tubercles. 



General distribution. R. angelini is widely reported from the Atlantic Ocean in which it probably 

 has its southern limit of distribution at the Sub-Tropical Convergence (see p. 255). 



