148 DISCOVERY REPORTS 



reach their maximum size by the second branchiferous segment, maintain this 

 maximum for two or three segments only and then rapidly diminish in size, whereas in 

 neapolitaiia the maximum gill development is often not attained for about the first lo 

 branchiferous segments (Fauvel in his Faune de France volume gives the 25th chaetiger) 

 and is maintained farther back along the body. Also the comb-chaetae in these 

 specimens had numerous very small teeth. The examination of several Mediterranean 

 specimens of Diopatra neapolitana has, however, shaken my confidence in the value of 

 this distinction based on the gills, and I remark that Fauvel states that in his Chinese 

 specimens the gills reached their maximum development by the 8th chaetiger. 



Moreover, even if dentata, as I understand it, be distinct from neapolitana, it is quite 

 probable that dentata will prove to be identical with one or more of Kinberg's species, 

 D. leuckarti, viridis, amaena and brasilietisis that have precedence by page. 



Diopatra neapolitana, Delle Chiaje. 

 Fauvel, 1933, p. 28, figs. 3 a-h, 4 a-l. 



Occurrence. St. 274. Off' St Paul de Loanda, Angola (6). 



Specific characters. These examples are supplementary to those from this station 

 attributed by me (1930, p. 124) to D. cuprea (Bosc). The tentacles are very long, the 

 occipitals reaching back to the 17th chaetiger. The gills begin at the 5th chaetiger, reach 

 their maximum a few chaetigers farther back, and although they show a certain decrease 

 in size after a few chaetigers, they remain sufficiently large to meet across the back up 

 to about the 50th chaetiger. The comb-chaetae have about 20 teeth. The lower jaw- 

 plates are rather delicate and lightly chitinized. 



Remarks. The differences between this species and D. piinctifera have already been 

 discussed under the heading of that species. I can see nothing but the greater develop- 

 ment of the gills to distinguish this specimen from the Antarctic examples from St. 149. 



Genus Rhamphobrachium, Ehlers 

 Two cushion-like palps, two short frontal tentacles, and five occipital tentacles borne 

 on ringed tentaculophores. A pair of tentacular cirri. Gills pectinate. Three anterior 

 feet very large and pointing forwards. They carry very long bristles with hooked ends. 

 Upper jaw with mandibles and toothed plates of which one is unpaired. 



Rhamphobrachium ehlersi, Monro (Fig. 27 a-c). 

 Monro, 1930, p. 126, fig. 46 a-?. 



Occurrence. St. 474 (i) 



Specific characters. An anterior fragment measuring 27 mm. by 5 mm. across the 

 body for 40 chaetigers. Anterior tentacles globular. Outer laterals spindle-shaped with 

 massive tentaculophores. Inner laterals more slender reaching to the anterior border 

 of the 2nd chaetiger. Median tentacle slightly shorter. Stout tentacular cirri inserted 

 on anterior border of first segment. The first three pairs of feet are much enlarged and 

 carried forward beneath the body. These have a stout dorsal cirrus, a conical ventral 



