The British Parasitie Copepoda by Thomas Scott; Andrew ScottReview by: G. P. F.The Irish Naturalist, Vol. 22, No. 9 (Sep., 1913), p. 180Published by: Irish Naturalists' Journal Ltd.Stable URL: http://www.jstor.org/stable/25524160 .

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ISO The Irish Naturalist September, ig t3.

REVIEW. The British Parasitic Copepoda. By Thomas Scott, LL.D., F.L.S.,

and Andrew Scott, A.L.S. Volumes I. and II. Copepoda Parasitic on Fishes. London : Ray Society, 1913. Vol. I., xii -j- 256 pp., 2 pi. Vol. II., xii. -f~ 144 pp., 72 pi. Price 40s. net.

It is thirty-three years since the appearance of the last volume of

Professor Brady's Ray Society Monograph of the free and semi-parasitic

Copepoda of the British Isles. The present volumes, dealing with the

Copepoda parasitic on fishes, continue the account of the Order and,

though the interval has been a long one, those to whom they are now avail

able have no reason to complain of the delay since it has allowed the authors

to deal very fully with their subject, and has given them an opportunity of personally observing almost all the species described.

The first volume contains the letterpress, the second, of almost equal size, the plates. The figures, which, with very few exceptions, have been

drawn by Mr. A. Scott from the actual specimens, seem to contain every

thing necessary for the identification of the species. The introduction gives a general account of the morphology and habits

of the two orders Caiigoidea and Ternaloidea, as exemplified by Lepeoph theirus and Lernaea. It may be noted that the authors, in describing the appendages of the Caiigidae, adhere to the nomenclature put forward

by Mr. A. Scott in his Liverpool Biological Society memoir on Caligus, and

afterwards adopted by Mr. C. B. Wilson in his papers on the same family.

They do not, however, refer to the difficulty which arises in comparing this arrangement with that found throughout all the rest of the Copepoda.

In the systematic section, the authors, though alluding to this usual

practice, have not attempted to revise any of the previously published classifications but have followed that adapted by Basset-Smith from

Gerstaecker. The 116 species of fish parasites which are described are

arranged under the Cyclopoidea, 5 species, the Caiigoidea, 49 species, and

the Ternaeoidea, 61 species, the single British representative of the peculiar

genus Ayulus usually reckoned amongst the Copepoda, making up the

total. Two species of Tevella, which are parasitic on whales and hence

do not come within the somewhat artificially restricted scope of the Mono

graph, are briefly referred to.

It appears from the title that a further volume, dealing with Copepoda

parasitic on animals other than fishes, may be expected, though there,

is no definite statement to this effect. It is to be hoped that the expecta tion will not be disappointed

G. P.F.

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