Gatly Marine Laboratory, St. AnJreics. 107 



posterior rounded area. A deep groove lies between the 

 keel and the" lateral ridge, and anollicr less pronounced to 

 the exterior ot it. Tlie former probal)ly represents the 

 nuchal groove, which debouches anteriorly ou each side of 

 tiie ujiuute Ironial process. The groove outside the ridge 

 runs lorward in the same direction, but appears to have a 

 less dehnite termination. The proboscis loinis u somewhat 

 ghjbuiar groo\ed mass, with rows ot" ratlier long conical 

 papilhe. 



Tlie body is, as usual, narrowed behind the anterior end, 

 and again increases at tlie eighth segment. Anteriorly the 

 i'eet arise nearer the anterior than the posterior border ol^ 

 the segment, but posteriorly they are close to the posterior 

 edge. The number of bristled segments is uncertain. 



'Ihc last setigeious process and row of hooks is followed 

 by three narrow non-bristlcd segments, bcaiiiig ludimentary 

 honiulogues of the feet in the shape of glandular enlarge- 

 ments, the last I'urmmg the prominent ring (Arwidsson's 

 callus-ring) from which tlie caudal funnel projects. On 

 the ventral surface a ridge runs Irom the first bristled seg- 

 ment to the edge of the caudal lunnel. The body docs not 

 diiiiinish much jjosteriorly, and has a broad circular shelf in 

 front of the funnel, troin which the latter projects like a 

 failed vase — that is, it has a constriction immediately above 

 the base and then gradually dilates to the rim bearing the 

 cirri, which, like those ot Axiolheila cutenala, are more or 

 less alternately long and short, one of the longer occurring 

 in the nud-vcntial fine or close to it. The grooved condition 

 of the lunnel is a prominent feature — three cirri generally 

 being included in each space, though a narrow one may 

 have only two. One had forty four tiattencd cirri, of which 

 twenty were long. The anal cone forms a rounded button 

 at the base of the vase, witli the central (anal) aperture 

 surrounded by minute papillae. 



In contrast with A. 6«/e//«/fl the anterior bristled segments 

 are moie glandular, segments 1-8 showing glandular rings, 

 especially anteriorly. 'Ihe bristles of this region also are 

 mure prominent than in the other species. 



The hrst three bristled segments bear spines, the first 

 ha\ing two or three, and the second and third four of the 

 same ehaiaeter. The spines are curved at the strong tip, 

 and the shaft is striated internally up to the tip. The 

 spines of the third segment are longer. The fourth segnrent 

 lias a considerable row of hooks (about twelve), with 

 long curved shafts, a wdl-marked shoulder from which the 

 neck dilates to the crown. Ihe great fang arises nearly at 



