agiremis are ually Tone: and hart or r geniculate, 
tfidosus, on the other hand, the inner spines are 
are not geniculate (fig. 14). The male fifth feet do not 
a o) species, except that in A. bifilosus they are rather 
Re stouter tha: those of A. longiremis. The caudal stylets are usually shorter 
in A, bifilos S, _ the last thoracic segment appears to be destitute of 
_ sete. After examining a large number of specimens of both forms, I 
nee between them to be comparatively unimportant, and 
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 afinis (Poppe). 
1881. ‘Temora isis, S.A. Poppe, Ueber Eine nene Art der Calan- 
aden-Gattung Temora, Baird, p. 55, pl. iii. figs. 1-14. f 
1881. Hurytemora hirundo, Giesbrecht, loc. cet., p. 152,§ pl. i. 
- figs. i 12, 19,’ &e. 
“1891. Eurytemora apinis, Brady, Brit. F.-W. Cyclop. and Calan., 
p. 42, pl. xiii, figs. 6-9. {] 
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). 
g and @ were nearly equally common, and many of the latter were 
carrying ova-sacs. Hurytemora affinis is readily distinguished from other 
British species of Calanide by the elongate abdomen (which is thickly 
clothed with very small stout sete) 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 Hurytemora 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 al aets 
in 
249 
rk 
es 
a 
. 
aah Sle | es 
Steyhos, nov. gen. (provisional name).** 
Like Pseudocalanus, except in the following particulars :— 
; ‘The anterior antennz are twenty-four- jointed. The female possesses a 
ae" 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 antenne 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 
sig 
a! ee Nee ees oie 
in Pseudocalanus. 
Stephos minor (nov. gen. et sp. provisional name). (PI. VII. figs. 1-13.) 
Length -7 mm. Gi: of an inch). Cephalothorax robust, thd\pody seg- 
ment about | s long again as the combined length of the next three. 
eS Anterior antenne about as long as the cephalothorax, 
, , Northumb., Durham, and Newcastle- “Upon -Tyne, vol, Xi. 
fter the name of our little steamer —the. Gariand—by means 
re or less success, investigated Phe, fauna of the Forth. 
the second pair two-jointed, of the third and fourth pairs three-jointed as _ 
sur 
