I50 ■ DISCOVERY REPORTS 



Soderstrom's fig. 149 is an accurate diagram of the relative sizes of the dorsal cirri, 

 except that the ist dorsal cirrus is considerably larger relatively to the 2nd, the relation 

 being similar to that shown in his fig. 137. 



Both rami of the feet carry very thick bundles of capillary bristles. The hooks 

 (Fig. 57, b) begin on the 9th chaetiger in the ventral ramus, and there is also at its 

 lowest point a sabre-shaped bristle which is usually broken. The dorsal ramus of the 

 last foot of the present fragmentary specimen shows no hooks. 



Remarks. P.pinnata, Ehlers, P. africana, Augener, and P. sexoculota, Augener, are 

 all distinguished by the collar round the prostomium and the presence of a gill on the 

 ist chaetiger. Caullery (1914) has suggested a sub-genus Parapriofiospio for those forms 

 in which the first pair of parapodia is similar to those following and carries a gill. 



Soderstrom contends, I think justly, that in these forms the ist chaetiger is morpho- 

 logically the equivalent of the 2nd chaetiger in Prionospio sensii stricto. The bristles 

 of the ist chaetiger have disappeared and the feet are modified to form the collar. The 

 two processes meeting in the middle line behind the head, as already described, may 

 possibly represent part of the modified ist chaetiger. If this is so, in the present 

 specimen the gills do not begin before the 3rd true chaetiger. But the gills from the 

 first bristle-bearing segment (2nd chaetiger) may have been lost. 



The Prionospio sp. of Soderstrom [loc. cit.) is very close to this species, if not identical 

 with it. Soderstrom, however, writes, "Ventral cirrus, notopodium and neuropodium 

 of the first bristle segment degenerate; dorsal cirrus not distinguishable." This is not 

 shown in his fig. 137 and difl^ers from the condition in P. africana. 



In spite of the diff'erences in the number and arrangement of the gills between the 

 present specimen and Augener's original examples I think it probably belongs to 

 Augener 's species. 



Augener records three pairs of gills all of about the same size, the first pair occurring 

 on the ist chaetiger. 



Family PARAONIDAE, Cerruti 



Genus Paraonis, Grube 



Paraonis (Paraonides) gracilis (Tauber). 



Levinsenia gracilis, Mesnil and Caullery, 1898, p. 136. 



Levimenia gracilis, Cerruti, 1909, p. 468. 



? Paraonis dubia, Augener, 1924, p. 72, fig. 25. 



St. 29. 16. iii. 26. West Cumberland Bay, South Georgia. 5-9 miles S 51° W of Jason Light. 

 23 m. Gear DC. Bottom: mud and stones. Ten specimens. 



Remarks.' Ten examples of this rare family, that are rather doubtfully conspecific 

 with the specimens originally described by Tauber from Denmark. They are rolled 

 into tight coils, which makes accurate measurement impossible. The size is about 

 20 mm. by -5 mm. for 80-100 chaetigers. There are no colour markings. The prostomium. 



