450 Part [11.—Twentieth Annual Report 
CRUSTACEA. 
~Sub-Class ENTOMOSTRACA. 
Order I.—COPEPODA. 
CALANIDA. 
Calanus hyperboreus, Kroyer. 
1838. Calanus hyperboreus, Kr., Danske Selsk. Afh., vol. 7 
p- 310, t. 4. 
A few specimens were obtained in a gathering collected about 22 miles 
to the north of Shetland on May 17th, 1901. One or two specimens 
were also found in another gathering collected to the east of the 
Shetland Islands on the 22nd of the same month, and as both these 
localities are within the British area, this northern Calanus is entitled 
to be regarded asa member of the copepod fauna of the British Islands. 
This appears to be the only Calanus in the North Atlantic or Arctic seas 
in which the last segment of the thorax has the postero-lateral margins 
distinctly angular. The size of specimens appears to vary a good deal, 
but one or two of the largest of those now recorded measured one-fifth 
of an inch (5 mm.) in length. 
Rhincalanus (?) gigas, Brady. 
I have again to record this copepod from the Moray Firth. It does 
not appear to differ much except in size from the form described by 
Dr. Brady under the name given above. 
Pseudocalanus elongatus, Boeck. 
I include this common species in these notes in order to mention the 
occurrence of a form somewhat smaller than the ordinary one. These two 
forms have been observed in the Firth of Forth and in the Moray 
Firth as well as off the Aberdeenshire coast. They were first noticed a 
good many years ago, and they are still occasionally noticed. Though 
the two forms have been carefully examined no important difference has 
been observed between them. 
Stephus minor,.T. Scott. 
1892, Stephus minor, T. Scott, 10th Ann. Rept. Fishery Board 
for Scot., pt. i., p. 245, pl. vii., figs. 1, 2, 10-13. 
This species occurred in a bottom gathering from Smith Bank, Moray 
Firth, collected on February 15th, 1901, at a depth of about 24 fathoms. 
Stephus minor, though apparently widely distributed, seems to be a rare 
species, as seldom more than one or two specimens are obtained in any 
single gathering. 
Stephus scotti, G. O. Sars. 
1896.  Stephus gyrans, T. Scott (not Giesbrecht), 15th Ann. 
Rept. of the Fishery Board for Scot., pt. ili., p. 146, pl. i, 
fie) 9) pl, all. eS: bie. 
Recently, when re-examining some copepoda collected in the Firth of 
Forth in 1892, I obtained a single female specimen of this species. 
