l8o The Irish Natiivalist September, 19 13. 
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, 191 3. Vol. I., xii + 256 pp., 2 pi. 
Vol. II., xii. + 144 pp., 72 pi. Price 405. 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 Caligoidea and Ternaloidea, as exemplified by Lepeoph- 
theirus and Lernaea. It may be noted that the authors, in describing 
the appendages of the Caligidae, adhere to the nomenclature put forward 
by Mr. A. Scott in his Liverpool Biological Society memoir on Cahgus, 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 o*f 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 Cahgoidea, 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. 
