SYLLIDAE 131 



cirri are subulate and slightly longer than the feet. The bristles have long pectinate and 

 bidentate end-pieces. 



Remarks. This specimen is larger than any hitherto recorded and the dorsal markings 

 rather different. Nevertheless I believe it to belong to Ehlers' species. According to 

 Ehlers the pharynx is very much coiled and there are no pharyngeal teeth. Augener 

 has recorded this species from Shark's Bay. 



The specimen from South Georgia may well belong to a different species, but with 

 the material at my disposal I do not feel justified in making a separation. It measures 

 10 mm. for an equal number of chaetigers and is quite colourless. Moreover, the general 

 aspect is rather different. The intersegmental constrictions are not so deep and the body 

 is less fragile. Furthermore, the long tentacles and dorsal cirri are quite smooth and 

 have no trace of the constrictions present in the New Zealand specimen and figured by 

 Ehlers for A. granosa. The eyes, too, are of a darker red than in the New Zealand 

 specimen, and the bidentate blades of the bristles are relatively longer and narrower. 

 I have not been able to examine the pharynx, etc. 



As far as external characters go, I can find nothing very definite to separate the two 

 specimens. 



Ehlers' A. infiiscata from Juan Fernandez has no visible nuchal organs and has long 



slender ventral cirri quite different from the stout, asymmetrical ventral cirri of the 



present specimens. 



Genus Autolytus, Grube 



The palps are fused and have moved down to the ventral surface of the head. They 



are coalescent. Tentacles and dorsal cirri unsegmented. There are no ventral cirri. The 



pharynx is more or less coiled and usually has a crown of teeth. The end-pieces of the 



bristles extremely small, rudimentary. Reproduction by stolons, which differ from the 



stock and are sexually dimorphic. The male {Polybostrichus) has bifid palps, three 



tentacles, one or two pairs of tentacular cirri, and swimming bristles in a number of 



segments. The female {Sacconereis) has no palps, three tentacles, one or two pairs of 



tentacular cirri, swimming bristles, and carries her eggs in a large sac attached to the 



ventral surface. 



With large nuchal epaulettes A. charcoti 



Nuchal organs not apparent ... ... ... ... ... ... ... ... A. simplex 



Autolytus charcoti, Gravier (Fig. 22). 



Gravier, 1907, p. 7, pi. i, figs. 1-2. 

 Benham, 1921, p. 27, pi. v, figs. 7-10. 

 Monro, 1930, p. 97. 



Occurrence. St. 42 (i); WS 27 (2); WS 228 (i). 



Specific characters. All these specimens are in rather poor condition. That from 

 St. 42 was preserved in a membranous tube entangled in the branches of a hydroid. 

 The largest measures 24 mm. by 3 mm. for between 90 and 100 chaetigers. The body is 

 marked by reddish brown transverse segmental bands, and in some specimens the 

 dorsal cirri also partly have this colour. The head is broader than long and has two pairs 



