DR. W. BATED ON NEW TUBICOLOUS ANNELIDS. 159 



Hab. Island of St. Thomas, West Indies. Collected by M. Sall(5. 

 (Mus. Brit.) 



2. Sabella nigro-maculata, Baird. PI. V. figs. 5 & 6. 



Worm rather short, broad and stout, tapering slightly near the 

 posterior extremity (fig. 5). 



The branchial fan consists of numerous short filaments united 

 near the base by a web, and about the fourth part of the length of 

 the body. They are of a dark brown colour spotted with white on 

 the rachis, are densely ciliated on one side with long stout cilia, 

 and on the rachis, which is smooth, there are at regular distances 

 about twenty other very short filaments, set in pairs (fig. 6). 

 Near the base of the filament spring a pair longer and broader, 

 and near the middle of its length another pair of the same kind. 

 The collar is deeply lobed and of a dark purple colour. The 

 body throughout its whole length is spotted with numerous dark 

 purple or nearly black dots of various sizes, but largest on the 

 superior extremity. The thorax possesses seven pairs of seti- 

 gerous feet. The two smooth filaments are short and flat, and 

 sharp poiated at the apex. The tube in which the animal lives 

 is rounded, and is composed of a toughish membrane covered 

 outwardly with a smooth coat of mud. 



The length of the animal is about 2| inches ; that of the tube 

 nearly double the length. 



Mab. Island of St. Vincent, West Indies. Trom the Eev. Lans- 

 downe Guilding's Collection. (Mus. Brit.) 



3. Sabella occidentalis, Baird. PI. V. figs. 7 & 8. 



Worm slender, of a cylindrical form, slightly tapering towards 

 the posterior extremity (fig. 7). 



Branchial fan composed of about sixteen filaments on each side. 

 The filaments are densely ciliated on one side ; the cilia of a 

 yellow colour for most part, interspersed at short distances with 

 black cilia, generally disposed in pairs, or in clusters of three, and 

 rather stouter than the others. The rachis is smooth, but dotted 

 along one side with numerous very small black spots (fig. S). 

 The filaments are all united near their base by a web, which is of 

 a dark purple colour. The two smooth filaments are short, and 

 sharp pointed at the apex. The collar is narrow and slightly bi- 

 lobed. The thorax has seven pairs of setigerous feet. We jjossess 

 no tubes belonging to the specimens. 



Hab. Island of St. Vincent, West Indies. From the Collection 

 of the Rev. Lansdowne Gruilding. (Mus. Brit.) 



