DE. BATED OK THE APHEODITACEAN ANNELIDES. 189 



long, being at least three times the length of tentacle or antennae. 

 The buccal cirri are about the same length as the antennae, and 

 are ringed with black and white. The body on the dorsal sur- 

 face is of a whitish colour, marbled with black. The sides, which 

 are covered by the elytra, are white ; and a broad, black, inter- 

 rupted line runs along the back, throughout its whole length. 

 The under or ventral surface of the body is of a bluish-black 

 colour, and a narrow uninterrupted white line runs down through 

 the centre. The elytra are 18 pairs in number, are oval, white, 

 with black dots on the outer sides and centre, and marked with 

 a black semicircular patch on the inner side. They do not over- 

 lap each other except near the head, being wide apart on the rest 

 of the body, and leaving the middle of the back uncovered. The 

 feet are very prominent, stout, rounded, conical, encircled with 

 fine, black, circular lines, and biramous. The ventral branch is 

 very much the larger, and the bristles are stout and amber- 

 coloured. They are rather long, and terminate in a slightly curved 

 point, beneath which they are for a short distance strongly ser- 

 rated on both sides. The dorsal branch of the foot is small, and 

 the setae sent off from it are few in number, of a white colour, 

 short, straight, and very finely serrated on each margin. The 

 dorsal cirrus is tolerably long and sharp-pointed ; it is peduncu- 

 lated, the peduncle being stout, conical, and of a deep black 

 colour. The ventral cirrus is short, conical, and sharp-pointed ; 

 and at the base of each foot there is a blunt papilla at each corner, 

 of the same dark colour as the under surface of the body. The 

 anal cirri are short, but tolerably stout, and ringed with black and 

 white. 



Hob. Esquimalt Harbour, Vancouver Island, J. K. Lord {Mus. 

 Brit.). 



Sp. 21. Halostdna Gteubei. 



Lepidonotus Grubei, Baird, Proc. Zool. Soc. April 1863. 



Animal about 2 inches long, and ■§ inch broad. Head small, 

 broad : eyes very small, placed, obliquely near each other ; ten- 

 tacle unfortunately deficient ; the peduncle, however, which re- 

 mains, is thick and marked at the base, on anterior margin, with a 

 small, round, raised, black spot. Antennae produced from the 

 anterior margin of cephalic lobe, rather short, somewhat club- 

 shaped and white at the extremity, broadly ringed with black at 

 their base and on anterior portion ; palpi conical, thick at the 

 base, of a uniform light-brown colour, except at the tip, which is 

 white, and a little longer than the antennae. The buccal cirri are 



