of the Fishery Board for Scotland. 
245 
feet in the female of A. longiremis are usually long and bent, or geniculate, 
near the middle ; in A. bifilosus, on the other hand, the inner spines are 
much shorter and are not geniculate (fig. 14). The male fifth feet do not 
differ much in the two species, except that in A. bifilosus they are rather 
stouter than those of A. longiremis* The caudal stylets are usually shorter 
in A. bifilosus, and the last thoracic segment appears to be destitute of 
setae. After examining a large number of specimens of both forms, I 
find the difference between them to be comparatively unimportant, and 
coincide with Dr Brady in considering the differences as of varietal value 
only. The characters which distinguish Acartia discaudata (Giesbrecht) 
— a form which I have already recorded from the Forth — are more marked, 
and show a greater divergence from A. longiremis. 
Eurytemora afftnis (Poppe). 
1881. Temora affinis, S.A. Poppe, TJeber Eine nene Art der Calan- 
aden-Gattung Temora, Baird, p. 55, pi. iii. figs. 1-14. | 
1881. Eurytemora hirundo, Giesbrecht, toe. cit, p. 152, § pi. ii. 
figs. 7, 12, 19, &c, 
1891. Eurytemora afiinis, Brady, Brit, F.-W. Cyclop, and Calan., 
p. 42,' pi. xiii. figs. 6-9,11 
Habitat. — In the upper reaches of the Forth, about Culross and between 
Kincardine-on-Forth and Alloa. It was moderately common in some tow- 
nettings collected in July 1891, and again in February this year (1892). 
<$ and 9 were nearly equally common, and many of the latter were 
carrying ova-sacs. Eurytemora affinis is readily distinguished from other 
British species of Calanidw by the elongate abdomen (which is thickly 
clothed with very small stout setae) and caudal stylets. The terminal 
spines of the swimming feet are very faintly serrate on the outer margin. 
It is strange that the occurrence of Eurytemora affinis, which is such 
an easily distinguished species, should have been so long overlooked, 
especially as it is at times comparatively common in the upper parts of 
the Forth estuary. 
Stepkos, nov. gen. (provisional name).** 
Like Pseudocalanus, except in the following particulars : — 
The anterior antennae are twenty-four-jointed. The female possesses a 
fifth pair of feet, which are simple, one-branched, and two-jointed, and the 
same on both sides. The fifth pair in the male form powerful grasping 
organs ; they are one-branched and dissimilar on the two sides. 
The posterior antennae and mouth organs are similar to those of 
Calanus. The outer branches of the first four pairs of swimming feet 
are three-jointed, the inner branches of the first pair are one-jointed, of 
the second pair two-jointed, of the third and fourth pairs three-jointed as 
in Pseudocalanus. 
Stephos minor (nov. gen. et sp. provisional name). (PL VII. figs. 1-13.) 
Length 74 mm. of an inch). Cephalothorax robust, the body seg- 
ment about half as long again as the combined length of the next three. 
Forehead rounded. Anterior antennae about as long as the cephalothorax, 
X Abhandl. des Natum. Ver., Bremen, vii. 
§ See also loc. cit., p. 167. 
IT Nat. Hist. Trans., Northumb., Durham, and Newcastle-upon-Tyne, vol. xi. 
Part I. 
** 2t60os garland. After the name of our little steamer— the Garland — by means 
of which we have, with more or less success, investigated the fauna of the Forth. 
