. Discovery reports. Discovery (Ship); Scientific expeditions. ALCIOPIDAE 83 St. 2SS. 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
. Discovery reports. Discovery (Ship); Scientific expeditions. ALCIOPIDAE 83 St. 2SS. 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 the
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