POLYCH^TA OF THE FAMILIES SERPULID^ AND SABELLID^. 353 



bifid, talon (fig. 5, a). In older specimens this is replaced, as in S. vitreus, by a thin 

 funnel-shaped one without a talon ; in one animal examined, both were present, one 

 inside the other, the thin funnel-shaped one having been produced before the loss of 

 the smaller massive one. 



There is a deep collar, and the species differs from S. vitreus and all other previously 

 described Paradexiospira in having collar-setae with such fine serrations that it is 

 almost impossible to recognise any at all. I have already suggested that the character- 

 isation of Caullery and Mesnil's sub-genera should be made more general (15, 

 p. 793), and this is another instance of the necessity of such a step, for S. falk- 

 landicus is undoubtedly closely related to the three forms known to Caullery and 

 Mesnil and placed by them in the sub-genus Paradexiosfira. Of these collar-setae 

 there are about nine, making with a few of the usual fine capillary ones a bundle con- 

 siderably smaller than the other thoracic fascicles. 



The uncini of the thorax are 40 to 50 mm. long, and contain about seventeen teeth ; 

 those of the abdomen are much smaller, being only 20 mm. long. 



The abdominal setae are flattened and trumpet-shaped, with one side produced. 



There seem to be twenty or more abdominal segments, but I did not succeed in 

 obtaining a complete specimen from a tube, the state of preservation not being good. 



Family Sabellid^. 



Genus Dasychone Sars, 1861. 



1. Thoracic and abdominal tori with single rows of avicular crotchets. 



2. Thoracic setae of one kind only. 



3. Branchiae with dorsal appendices. 



Dasychone violacea {^cXwaax^Q.), 1861. 



Sabella violacea Schmarda (17, p. 34). 

 Da&ychone violacea M'Intosh (12, p. 504). 



1. Dorsal appendices large and somewhat spathulate, covering an ocellus on 



either side of the rachis. 



2. A dark pigment spot on each side of every segment, between the fascicles of 



setae and the tori. 



3. Thorax of eight setigerous segments. 



4. Crotchets with very fine serrations above the large fang. 



Locality. — One specimen from Station 478, Table Bay, May 1904. Total length 

 26 mm., of which the branchiae form 8 mm. ; the width is about 4 mm., except close to 

 the posterior end, where it decreases rapidly. There are seventy abdominal segments. 



The setae and crotchets agree entirely with those so clearly described and figured 

 by M'Intosh. 



