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 

 setse. 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 affinis (Poppe). 



1881. Temora affinis, S.A, Poppe, Ueber Eine nene Art der Calan- 

 aden-Gattung Temora, Baird, p. 55, pi. iii. figs. 1-14. J 



1881. Eurytemora hirundo, Giesbrecht, loc. cit, p. 152,§ pi. ii. 

 figs. 7, 12, 19, &c. 



1891. Eurytemora ajfinis, Brady, Brit. F.-W. Cyclop, and Calan., 

 p. 42,' pi. xiii. figs. 6-9. IT 



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). 

 d and $ were nearly equally common, and many of the latter were 

 carrying ova-sacs. Eurytemora affinis is readily distinguished from other 

 British species of Calanidce by the elongate abdomen (which is thickly 

 clothed with very small stout seta?) 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 aflinis, 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. 



Stephos, 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 antenna3 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). (PI. VII. figs. 1-13.) 



Length *74 mm. ( 7 / ? 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 antennas about as long as the cephalothorax, 



X Abhandl. des Naturn. Ver., Bremen, vii, 



§ See also loc. cit., p. 167. 



IT Nat. Hist. Trans., Northumb., Durham, and Newcastle-upon-Tyne, vol. xi. 

 Part I. 



2re(pos 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. 



1 



ur*T 



