DE. BAIRD ON THE APHBODITAOEA-TST ANNELIDES. 191 



divisions of which they are composed placed very close to each 

 other. The bristles of the elytra- and cirri-bearing feet are 

 similar in structure; those of dorsal or upper division stout, 

 smooth, somewhat curved as they approach the point, enlarged 

 and flattened and uncinate at the point ; those of ventral or lower 

 division a little more slender, slightly enlarged near the point, 

 which is straight, blunt, and striated across. The bristles of both 

 bundles are nearly of equal length, and two or three similar to 

 those of ventral division are mixed up with the bundle of bristles 

 of dorsal division. The two spines are stout, rather long, straight, 

 and blunt-pointed. All these organs are of a yellow colour. The 

 dorsal cirri are white, rather short, about equal in length to the 

 foot itself; the ventral cirrus very short. The elytra are 35 

 pairs in number, thin, membranous, and of a light brown colour. 

 The anterior pair overlap each other slightly in the centre of the 

 back ; but for the rest of the length of the body the middle portion 

 of the back is uncovered. 



Hah. Vancouver Island, J. K. Lord (Mus. Brit.). 



A good many specimens of this interesting species were taken 

 by Mr. Lord at Macaulay's Point, Vancouver Island ; and they 

 were all found nestling under the shell, and occasionally coiling 

 themselves under the foot of the animal of the Fissurella cratitia. 

 I have named it after its discoverer, J. K. Lord, Esq. 



Sp. 23. Halostdna fragilis. 



Lepidonotus fragilis, Baird, Proc. Zoot. Soc. April 1863. 



This species appears, from a re-examination of the specimens 

 in the collection, to belong to the genus Halosydna of Kinberg. 

 It is exceedingly brittle, and, owing to the specimens brought 

 home by Mr. Lord being broken into several pieces, it is impos- 

 sible to describe the species accurately. The head is rather small, 

 and the eyes are placed obliquely, but not very near to each other. 

 The tentaculum and antennae, with the palpi and buccal cirri, are 

 all short, nearly of equal length, and almost white or colourless. 



The elytra are very deciduous, and appear to be numerous, and 

 to leave the centre of the back uncovered ; but it is impossible to 

 sta,te the number, as it is extremely difficult to be able to fit the 

 fragments into which the body is broken to the respective indivi- 

 duals. The whole body of the worm appears destitute of any 

 markings or colour. The feet are moderate in size and are bira- 

 mous. The ventral branch is much the larger, and the bristles 

 belonging to it are of a light amber-colour, uncinate or hooked at 

 the point, but quite smooth and not toothed or serrate on the 



