2 Mr. I, C. Thompson on the Copepoda 
Of these, four species are new to science, viz, :— 
Eucheta oceana. 
Xanthocalanus Giesbrechti. 
Scolecithrix chelifer. 
Isocheta longisetosus. 
The males of several species of which the females only were 
hitherto known have been found, but many of them unfortu- 
nately only in an immaturestage. The known geographical 
range of a considerable number of species has been largely in- 
creased through this collection. The tow-nets used were open 
ones and were lowered to ascertained depths and then trailed at 
the depth indicated and brought open to the surface. There- 
fore some surface or near surface and intermediate forms 
may probably have been captured during the descent and 
ascent of the nets, and should be subtracted from the total 
catch of the deeper nets. Mr. Murray’s method of using 
the tow-nets during the ‘Oceana’ cruise is described in a 
paper by him entitled “Exploration of the Intermediate 
Depths of the Ocean” (Journal of the Royal Geographical 
Society, vol. xi. p. 297, 1899). Some valuable particulars 
as to the distribution of life at various depths are thus recorded. 
On p. 6 a table is given showing the depth at each station 
and also the number of species found. From this it appears 
generally that the smallest number of species existed at or 
near the surface, and the largest variety at a depth of 
1070 fathoms. Between that and 1510 fathoms the numbers 
are rather less, but average fairly ; while below that, possibly 
as a coincidence, the numbers decline until the greatest depth 
of 1770 fathoms was reached. Throughout the paper I have 
mainly followed the excellent classification and nomenclature 
of Dr. Giesbrecht, to whom I desire to express my sincere 
obligations for much help; and | am also greatly indebted to 
the works of my friends Dr. Brady, F.R.S., and Messrs. T. 
and A. Scott for valued assistance. 
List of Species and Stations of Occurrence. 
Family CaLanipZ. 
Calanus finmarchicus, G'unner.—2 b, 2d, 2e, 2f,4a,4d, 4f,49, 4h, 4), 
eee 56, 5c, 5d, 5e, 5f, 5g, 5h, 57, 5k, 51, Ga, 6e, 6d, GF, 
IG; d. 
eristatus, K7vdyer.—5 h, 5k, 6 g. 
gracilis, Dana.—2 c,4¢, 4h, 5e, 57, 59. 
—— tenuicornis, Dana.—6 h. 
Eucalanus elongatus, Dana.—b5 e, 5f, 59, 5h, 57, 5k, 51, 6g. 
attenuatus, Dana.—2f, 2g,4a,4d,4f, 4h, 4k, 56, 5c, 5d, 5e, 54, 
Dike, Oil, . 
