178 Transactions. — Zoology. 



a lobule and 5 on the outer ; thus there are about 160 to 176 

 tentacles altogether. Each tentacle is grooved on its upper — 

 i.e., oral — face. These grooves lead into a furrow running down 

 the lobule ; the latter leads to a similar furrow on the lobe ; 

 thence a furrow passes across the oral disc to the subcentral 

 mouth, which is transversely disposed. The structure of this 

 tentacular crown appears to relegate the worm to the genus 

 Dendrostoma as defined by Selenka* and by Shipley,! and the 

 internal anatomy agrees with this diagnosis. 



Colour. — The colour of the preserved specimens is a very 

 pale yellowish-brown, and has a shiny appearance. The pos- 

 terior end in some individuals is more definitely brown, while 

 in other cases there is a well-marked dark ring round the base 

 of the introvert. Some individuals are nearly white. Fortu- 

 nately, I have a note as to the colour and appearance of the 

 living worms collected at Warrington. They are white and 

 smooth to the naked eye. Some are slightly brownish. One 

 individual has white tentacles ; in another these are reddish- 

 brown ; and Dr. Agnes Kelly, who collected a number of 

 specimens at Waiheke, has noted that they are " yellowish- 

 grey " ; and in alcohol they have a more decidedly yellow 

 tint than those collected by me. 



The surface of the body is almost smooth in the preserved 

 specimens ; but posteriorly there are longitudinal and circular 

 furrows which mark out irregular rectangular areas. These are 

 distinctly visible in some individuals over the hinder third of the 

 body, becoming more distinct as the extremity is approached. 

 These rugosities appear again towards the base of the introvert. 

 In Button's specimen (&), and in some individuals variously 

 preserved, these furrows are much less evident than in others, 

 so that the body appears in these cases much smoother 

 and more shiny. Thus, in the Warrington specimens a 

 hand-lens is required in order to see these very shallow circu- 

 lar furrows, whereas in some well-preserved individuals from 

 Rangitoto and from Auckland they are very much more 

 distinct, and the "raised areas" render the body rough- 

 looking, especially posteriorly. 



There appear to be no papillas, but under a hand-lens 

 minute black dots are recognisable sparsely scattered over 

 the body, which are probably minute papillae. 



The introvert itself is smooth, paler in colour than the 

 body, and is provided with 3 or 4 irregular circles of 

 widely spaced blunt hooks, which are nearer together on the 

 dorsal than on the ventral side. These circles of hooks occupy 

 -about the middle third of the introvert, the anterior margin of 

 which is deeply pigmented, and forms a prominent collar. 



* "Challenger" Eeports, vol. xiii., pt. 36 (Sipunculida;) , p. 14. 

 t " Cambridge Natural History," p. 425, 



