lUO DB. W. BAIRD 0]N' NEW TUBICOLOUS AlfJfELIDS, 



4. Sabella grossa, Baird. 



Worm remarkably tliick, short aud solid-looking, of a uniform 

 dark olive colour, aud about the same dimensions anteriorly as 

 posteriorly. 



The branchial filaments of the only specimen we possess have 

 unfortunately been destroyed, but the peduncle upon which they 

 were placed remains, and exhibits a spiral twist like that repre- 

 sented in M. Milne-Edwards's figure of Sabella unisjjira in Cuvier's 

 'Animal Kingdom' (Crochard edition, t. 4. fig. la). The collar 

 is everted, thick, and bilobed. The thorax possesses eight jiairs 

 of setigerous feet. The smooth (?) tentacles are wanting ; the 

 specimen, which has been for a good many years in the Museum 

 Collection, being in only tolerable preservation. There is no tube 

 belonging to the specimen. Length of animal (without branchiae) 

 about 4 inches, breadth about 7 or 8 lines. In general appear- 

 ance it resembles S. melania of Schmarda from Jamaica. 



Hah. Island of St. Helena. From the Collection made during 

 the voyage of H.M.S. ' Chanticleer.' (Mus. Brit.) 



5. Sabella grandis, Baird. 



Worm of a rather square or quadrilateral shape, tapering 

 slightly to the extremity, which terminates in a sharp point. 

 Length (without branchiae, which unfortunately have been lost) 

 about 6| inches. 



CoUar rather broad and deeply bilobed. Thoracic feet seven 

 pairs. Segments belonging to them smooth, not grooved on the 

 upper dorsal surface. Body of a dark brown colour on the back, ra- 

 ther yeUow underneath or on the ventral surface. Feet numerous, 

 about 100 in number. Peduncles large, well developed. An- 

 terior and posterior divisions separated by a groove, in the centre 

 of which are situated the feet. Along the dorsal surface, with 

 the exception of the seven first or thoracic segments, there runs a 

 deep groove dividing each segment into two halves. The setae of 

 the feet appear in many instances to be enveloped in a mem-, 

 branous little bag, which, falling off, allows the setae to project. 

 These are short, slender, smooth, setaceous, and very sharp 

 pointed. 



The case in which the worm lives is somewhat larger than the 

 animal itself, and is a round and leathery-looking tube covered 

 over externally with a thin coat of mud. 



Hah. Coast of New Zealand. From the Collection of Sir A. 

 Smith, M.U. (Mus. Brit.) 



