. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. 232 MALDANIyE. Arenicola Boeckii,Ratfikei7i Nov. Act. Acad. Nat. Cur. xx. 181. tab. 8. f. 19-22. Lumbricus marinus, another species, Dalyell, Potv. Great, ii. 137- pi. 19. f. 4-6. Hab. The littoral region, in sand. Arenicola ecaudata (No. XLII.) is from 6 in. to 8 in. long, very contractile, minutely granular, of a yellowish-brown, tinted in many No. XLII.—Arenicola places with green and yellow, or sometimes very black, glossed with green. The primary rings seem to be composed of only
. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. 232 MALDANIyE. Arenicola Boeckii,Ratfikei7i Nov. Act. Acad. Nat. Cur. xx. 181. tab. 8. f. 19-22. Lumbricus marinus, another species, Dalyell, Potv. Great, ii. 137- pi. 19. f. 4-6. Hab. The littoral region, in sand. Arenicola ecaudata (No. XLII.) is from 6 in. to 8 in. long, very contractile, minutely granular, of a yellowish-brown, tinted in many No. XLII.—Arenicola places with green and yellow, or sometimes very black, glossed with green. The primary rings seem to be composed of only four intermediate ones. The first fourteen or fifteen pairs of setigerous feet are destitute of branchise, but to every foot behind these there is appended a dark red arborescent branchial tuft : in one specimen there were twenty-two pairs, in another twenty-five; the first few pairs are smaller than those about the middle, whence they again decrease towards the tail. In other respects the structure is similar to that of Arenicola piscatorum. Obs. Grube has suggested that the A. ecauduta may be identical with the preceding, and in support of this conjecture it may be re- marked, that in both the first pair of branchiae are attached to the same segment. In the few specimens I have seen, however, there was no appearance of an apodous portion, for the last segment, which was abranchial, had its pair of setigerous feet. This is confirmed by the description and figure of Sir J. G. Dalyell. The fewest number of pairs of branchiee I have seen is 22 and 25; Dalyell's specimen had about 38 ; and Rathke introduces 40 into his specific character. It is evident, however, that the number depends on age and en- tirety ; for as there is no development of a posterior portion, there is nothing, except maturity, to regulate the number of organs which are developed in succession. Fam. XIV. MALDANI^. MALUANiiB, Savign. Syst. Annel. 92. Maldania, Grube, Fam. Annel. TG. Char. Body vermiform, cylin
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