DR. W. BATED ON NEW TUErCOLOUS ANNELIDEfS. 21 



latis. Operculum et filamentum opercuHgerum alba. Operculum pro- 

 funde infundibulatum, multicrenatum. Tubus teres, solidus. 



A single specimen of this species of the restricted genus Ser- 

 pula was taken by Mr. Jukes, during the voyage of the ' My,' on 

 the coast of Australia. The branchiae are rolled up in a single 

 spire, and are of a dull milk-white colour ; the filaments are about 

 thirty- four in number on each side, and on the dorsal surface are 

 pretty deeply grooved or channelled. The operculum is deeply 

 infundibuliform, of a white colour, the edge indented with nume- 

 rous close-set crenations, the grooves extending down along the 

 whole length of the outer surface. The body of the animal tapers 

 towards the extremity, and is of a dull reddish colour and strongly 

 striated across. The total length of the animal is about 1| inch, 

 the breadth about 1| line. Only a fragment of the tube in which the 

 worm lives was preserved. It is perfectly cylindrical, without any 

 keel or striae, is thick and solid, and of a white colour externally. 



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



10. Sebpula Naeconensis, Baird. (PI. II. figs. 7 & 8, oper- 

 culum.) 



BranchiBe in spiram unam convolutse. Operculum lacteum, minime pro- 

 fundum, dense crenatum; petiolum operculigerum gracile, prope 

 finem nodosum. 



This is a small species collected at Narcon Island during Captain 

 Sir J. Eoss's Antarctic exploring expedition ; and only one spe- 

 cimen, withoiit the tube, was procured. The chief character 

 which marks the species is the form of the operculum. This is a 

 white, rather shallow disk, elegantly formed, beautifully multi- 

 crenate on the margin, and radiately grooved on its upper surface 

 internally as well as externally. The pedicle which supports it 

 is slender, and terminates near the summit in a rounded knob, 

 upon which the operculum is seated, being attached to it by a 

 short stalk, which appears like a moveable joint. There is nothing 

 particular in the form or characters of the body, except that it is 

 short and stout, measuring in total length, including branchiae 

 and operculum, about 10 lines. 



Sah. Narcon Island. (Brit. Mus.) 



11. Sebptjla Zelandica, Baird. (PI. II. fig. 9, operculum.) 

 Animal, operculo excepto, ignotum. Operculum album, parvum, mi- 

 nime profundum, margine crenis viginti ornatum. Tubus gracilis, 

 albus, repens, fere rotundus, carina longitudinali parva in dorse sig- 

 natus ; transversim flexuose striatus. 



