ALCIOPIDAE 83 



St. 2SS. 2i.viii. 27. 00° 56' 00" S, 14° 08' 30" W. 250 (-0) m. Gear TYF. One specimen. 

 St. 2S9. 23-24. viii. 27. 3° 04' 45" N, 16" 52' 00" W. 125-225 (-0) m. Gear TYF. One specimen. 



Remarks. There are three pairs of tentacular cirri. The ventral pedal glands are in 

 these specimens colourless, and reach their full development about the I2th-i5th 

 chaetigers. Greeffia celox (Greeff) has four pairs of tentacular cirri. I figure the anterior 

 end seen from below (Fig. 25). 



Genus Rhynconerella, Costa 



Rhynconerella fulgens, Greeff. 



Fauvel, 1923, p. 210, fig. 79 a-d, with synonymy. 



St. SS 33. 20. i. 28. 60° 52' S, 25^ 59' W. 250-100 m. Gear N 70 V. Three specimens. 



St. SS 53. i6. ii. 28. 61° 30' 00" S, 23° 20' 00" W. 250-100 m. Gear N 70 V. One specimen. 



29° 27' N, 15° 07' W. 0-900 m. One specimen. 



T-3t 



Fig. 26. Rhynconerella fulgens . Middle foot. 



Remarks. The dorsal cirrus of the 3rd segment is about twice the length of the other 

 tentacular cirri: there is only a single acicular chaeta in the middle feet (Fig. 26). 

 Ehlers records this species from 58° 29' S, 89° 58' E. 



According to Chamberlin (1919, p. 143) Rhynconerella gracilis is the type species of 

 Costa's genus. R. gracilis is the same as Callizona nasuta, Greeff, the type species of 

 Greeff's Callizona, which genus therefore becomes a synonym of Rhynconerella. This 

 means that all the species which previous authors grouped under Callizona are now to 

 change their generic name to Rhynconerella, and Chamberlin has supplied Plotohelmis 

 as the generic name for the species that previous authors have grouped under Rhyn- 

 conerella. Rhynconerella fulgens , Greeff, is presumably the type species of Chamberlin's 

 Plotohelmis. It seems to me that this is an occasion when to adhere to the rule of priority 

 would only lead to confusion, so I retain the generic names Callizona and Rhynconerella 

 in the sense in which they are used by Apstein, Fauvel and others. 



The example from 29° 27' N, 15° 07' W is in two pieces, which together measure 

 about 15 mm. in length. The condition precludes a satisfactory examination, but the 

 shape of the body is more elongated and slender than in the Antarctic specimens. They 

 may possibly belong to the longer and more slender Rhynconerella alata (Chamberlin). 

 I can, however, discover no distinction in the feet between this specimen and R. fulgens. 



