20 DK. W. BAIKD ON NEW TUBICOLOUS ANNELIDES. 



of Australia. A single specimen was added to our collection 

 about eight or nine months ago by Dr. Bowerbank, but no tube 

 was collected, nor have we any further information about it. 



8. PoMATOSTEGUS BowEBBANKi, Baird. (PL II. figs. 4 & 5, 

 operculum.) 



Branchiae curiae, in spiram unam et dimidiam convolutae. Opercula 

 quatuor, versus apicem decrescentia, inarmata. 



The branchiae are rather short, the filaments plumose on one 

 side only. Operculigerous lobe thick and fleshy. Operculum 

 consisting of four stories united by a common central column, 

 and densely covered with a rough coat of short hairs or filaments 

 of a fibrous substance. These opercula diminish in size as they 

 ascend, the last being very small and not armed with any spines 

 or horns. Collar small. Thoracic portion of body short, square- 

 shaped. Bristles of feet rather long and of a yellowish colour. 

 Abdominal portion of body gradually tapering to the extremity, 

 and striated across, the striae wide apart. It is of a reddish-brown 

 colour. The total length is 2^ inches. 



Hah. Seas of Australia. (Brit. Mus.) 



Grenus Seepula, as restricted ly PMlippi. 



Taking the operculum as his principal character, Philippi re- 

 stricts the old genus Serpula to those species which are distin- 

 guished by having the operculum of a horny substance, in the 

 form of a rather shallow or funnel-shaped plate, the concave disk 

 crenate on the margin, radiately grooved above, and supported on 

 a subcorneal fleshy petiole. This organ is in many species of a 

 beautiful shape, and, having in some instances a vitreous look, 

 might, as Dr. Johnston well observes, " make an elegant pattern 

 for a wineglass." 



The species hitherto enumerated have been confined to the 

 European fauna : I am not aware, at least, of any that have been 

 described from any other part of the world ; and Schmarda, who 

 is amongst the latest authors that have paid attention to exotic 

 Annelides, remarks that, however common they are in the Medi- 

 terranean, he has not found one exotic species. It is with much 

 pleasure, therefore, that I dedicate the following, from Australia, 

 to Mr. Jukes, to whom the British Museum is indebted for the 

 specimen. 



9. Serpula Jukesii, Baird. (PI. II. fig. 6, operculum.) 

 Branchiae in spiram unam convolutae, lacteae, filamentis dorso canalicu- 



