. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. 164 NEREIDjE. Specimens preserved in spirits are of a uniform pearl-grey colour, with pale yellowish feet. Heteronereis renalis is in many respects so much like the H. lohu- lata of Savigny, that I have hesitated in describing them as distinct species; but the dissimilarity in the structure of the feet, though apparently slight, and difficult to be expressed in a definition, seems to be of a kind that nothing less than specific origin could produce. In H. lobulata the leaf-like lamina of the seti
. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. 164 NEREIDjE. Specimens preserved in spirits are of a uniform pearl-grey colour, with pale yellowish feet. Heteronereis renalis is in many respects so much like the H. lohu- lata of Savigny, that I have hesitated in describing them as distinct species; but the dissimilarity in the structure of the feet, though apparently slight, and difficult to be expressed in a definition, seems to be of a kind that nothing less than specific origin could produce. In H. lobulata the leaf-like lamina of the setigerous tubercle is oval, and not more than half the size it has in H. renalis; and the foliaceous appendage to the ventral cirrus in the former is also pro- portionably small, and of a roundish figure, without any additional lobular appendage. Nereis margaritacea, described in the 'Annals,' vol. iii. p. 294, is also nearly allied to this species, and is, I suspect, the same as the Nereis podophrjlla of Savigny. It requires re-examination; and I would remark, that as these species are easily injured, and their appendages tear and fold up readily, several feet ought to be ex- amined before fixing on their true shape and character. I had made several figures of the feet of Heteronereis renalis before the one now given, which, I believe, exhibits a correct outline of its ordinary conformation. No. XXXII.—Heteronereis There is such a close resemblance between the shape of the feet in our Heteronereis renalis and the H. fucicola of Oersted, that they might be presumed to be synonymous ; but the latter differs in having very long tentacular cirri. It is also a much smaller species. Obs. The tentacular cirri are as long as, or longer than, the breadth of the post-occipital segment, which is rather longer than the second. There were 110 segments in one specimen; they are crowded on the posterior portion. 3. H. longissima, jaws obsoletely serrated at the base, plain towards t
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