Clare Island Survey — Archiannelula and Polychueta. 47 27 



The third foot (fig. 3c) has a blunt setigerous lobe, pierced at the dorsal 

 angle by a thick spine, 7-10 compound setae, of which 1 or 2 have long tips 

 and 6-8 have short tips. A single simple seta is present in the dorsal 

 res-ion of the foot. The dorsal cirrus is Ions:, the ventral cirrus short 

 and thick. The 16th foot (fig. 3d) has proportionally a much smaller 

 setigerous lobe, with a simple dorsal seta, slender spine, and six compound 

 setae with long tips. The ventral cirrus is considerably longer than in 

 the anterior segments. 



The simple seta is present in all segments. In the anterior segments, 

 it is slightly curved, serrate near the tip, and the latter is not winged 

 (fig. 3e, a). Further behind )fig. 3f, a), a delicate wing envelops the tip 

 of the seta. The setae in segments 1-5 are much shorter and thicker 

 than those in the other segments. One or two of them have slender 

 serrate tips with bluntly rounded points (fig, 3e, b). The remaining setae, 

 6 or 8 in number, have short, thick terminal pieces (fig. 3e, c). All these 

 compound setae have swollen ends to the shafts, which are produced into 

 a number of short rounded lobes. 



Behind the 5th segment the setae are much thinner. The terminal 

 pieces differ only slightly in size (fig. 3f, b, e), and are serrate, with simple 

 rounded tips. The end of the shaft is serrate along one edge, and is pro- 

 duced into 4 sharp lobes. The simple seta is toothed along the convex side, 

 and the tip has a delicate wing (fig. 3f, «). The spine is slender, with a 

 bulbous tip (fig. 3f, c), 1 or 2 in each foot. 



Capillary setae commence in the 11th setigerous segment, and are present 

 in all the following segments except one or two at the posterior end. The 

 length of the capillary setae exceeds the width of the body. 



The ventral cirri are much longer in the posterior segments than in the 

 anterior. 



The proboscis (fig. 3a) is straight and broad, dark reddish-brown in colour, 

 occupying 3-4 segments, and is unarmed. 



The proventriculus occupies 4-5 segments, and has about 50 rows of 

 glands. 



All the specimens obtained were mature males, with the body-cavity full 

 of sperm. They were taken in April, September, and October. 



This species seems to be most closely allied to the Strc^tosijUis varians 

 of de Saint-Joseph. It resembles this species in having 5 setigerous segments 

 in the anterior region, and in having simple tips to the compound^ setae. It 

 differs in having a slender spine in the first setigerous segment, in the shape 

 of the terminal pieces of the anterior setae, in the presence of the simple 

 dorsal setae in all segments, in having 3 anal cirri, and in other details. 



D2 



