of the Fishery Board for Scotland. 237 
CRUSTACEA. 
SUB-CLASS ENTOMOSTRACA. 
Order I. COPEPODA. 
CALANID#, 
Eucalanus elongatus (Dana) ; and Hucalanus crassus, Giesbrecht. 
LT have at different times during the past few years recorded these two 
species of Hucalanus from the north-east. and north of Scotland, and this 
year I have again to note their occurrence in Scottish waters, but from a 
locality different from those previously mentioned—viz., at about fifty 
miles south-east of the Fair Island, between Orkney and Shetland. They 
were obtained in at least two tow-net gatherings collected on October 
19th, 1900, by the steam trawler “St. Andrew.” A number of specimens of 
both species were observed in this gathering. 
Rhincalanus (?) gigas, Brady. (Pl. XVII., figs. 1-4.) 
Rhincalanus gigas, Brady, Challenger Reports, vol. vii., Copepoda, 
p. 42, Pl. VIIL., figs 1-11. 
Several specimens of a Rhincalanus, apparently belonging to 2. gigas, 
Brady, were obtained in one of the tow-net gatherings collected to the 
eastward of the Fair Island, in which the two species of Hucalanus 
mentioned above were observed. Most of the specimens were females, 
and were apparently adult ; about half a dozen males were also observed,_ 
but they were considerably smaller than the females, and appeared to be 
scarcely mature. 
The only apparent difference between these female specimens and 
R. gigas, Brady, is in their size. The specimens of Rhincalanus gigas 
described by Dr. Brady measured from 8°5 to 10 millimeters, while those 
collected to the eastward of the Fair Island were 5 mm. in length. In 
these specimens the fifth pair of feet in the female are identical in form 
and armature with those of R. gigas. Figures 10 and 11 of Plate VIII. 
in Dr. Brady’s ‘‘ Challenger” Report probably represent the fifth feet and 
abdomen of a male specimen ; they resemble closely figures 2.and 4 on 
Plate XVII. of this paper, which represent similar parts of one of the 
immature males in the collections from the Fair Island. Figure 3 (Plate 
XVII.) represents the last thoracic segment and abdomen of one of the 
female specimens. [am inclined to ascribe the Fair Island specimens to FR. 
gigas, though they are somewhat smaller than those recorded by Dr. 
Brady, rather than to A. nasutus, Giesbrecht. It may also be noted in 
passing that #. nasutws is in some respects, and especially in the form 
of the female fifth feet, not very unlike 2. gigas, Brady. 
Stephus gyrans (Giesbrecht). 
1892. Mobianus gyrans, Giesbrecht, Pelagischen Copep. d. Golfes 
v. Neapel, p. 205, PI.:5, 9, 35. 
1897, Stephus gyrans, T Scott, Fifteenth Ann. Rept., Part IL, 
p: 146, Pl iby tis. 9*Piy Li figs. dks. 
This distinct species was recorded for Loch Fyne in 1897, and up till 
last year this was the only Scottish locality where Stephus gyrans had 
been observed ; now, however, Iam enabled to record it from a second 
