A5A Part III.—Twentieth Annual Report 
somewhat from the fifth pair of the male of Phenna spinifera, Claus, 
especially in the terminal part of the left branch, when compared with 
the figure of the male fifth pair in Dr. Giesbrecht’s work *; and I have 
therefore provisionally retained it under a separate specific name. 
CENTROPAGID/. 
Metridia longa (Lubbock). Pl. XXII., figs, 1-4. 
One or two specimens of Lubbock’s Metridia (Calanus) longa were 
found in a gathering collected about 22 miles to the north and in another 
collected about 60 miles to the east of the Shetland Islands ; the first was 
collected on May 17th, and the other on May 22nd, 1901. One of the 
largest specimens taken in the first gathering measured 4 mm., or about 
one-sixth of an inch in length. The male and female specimens 
represented by the drawings (figs. 1. to 4) were obtained in the second of 
the two gatherings mentioned above ; this female, which is scarcely so 
large as the largest specimen found in the first gathering, measured about 
3'7 mm. and the male 2°8 mm. in length. The fifth pair of thoracic feet 
of the male and female, as represented by the figures 3 and 4, are 
practically identical with the figures of the same appendages given by 
Dr. Giesbrecht.t 
Metridia lucens, Boeck. 
This species was moderately frequent in the same gatherings with the 
last, as well as in gatherings from the Moray Firth and from other paris 
of the Scottish coasts. | 
PSEUDOCYCLOPIDA, 
Pseudocyclops obtusatus, G. S. Brady. 
One or two specimens of this curious species occurred in the washings 
of some dredged material from the north-west end of Inchkeith, Firth of 
Forth, collected on May 23rd, 1901. Pseudocyclops obtusatus has already 
been recorded from the Forth estuary, but has not been very often met 
with. 
PONTELLIDA. 
Acartia bifilosa, Giesbrecht. 
Acartia bifilosa was obtained along with the two species of Metridia 
mentioned above in the gatherings from the north and east of Shetland, 
and also in gatherings from the Firth of Forth recently collected. 
CYCLOPID. 
Orthona (2) seteger, Dana. 
Several specimens of an Ozthona which I ascribe to Ozthona setiger, 
Dana, occurred in a tow-net gathering from the Firth of Forth collected 
on April 22nd, and also ina similar gathering collected to the east of the 
Shetland Islands on the 22nd of May, 1901. In these specimens the 
rostrum, which projects forward instead of downward as in 0, 
helgolandica, Claus (O. similis, Giesbrecht), tapers gradually to an acute 
* Fauna u. Flora d. Golfes v. Neapel, vol. 19, p. 298, t. 12, fig. 5, 
+ Pelagischen Copepoden dcs Golfes von Neapel, pl. 33, figs. 20 and 28. 
