MR. Of. S. BRADY ON THE PELAGIC ENTOMOSTRACA. 37 



Temora Fimnarchica, Claus ; Die frei lebenden Copepoden, 

 p. 195, T. XXXIV, figs. 1-11. 



Diaptomus longiccmclatus, Lubbock; Aim. & Mag. Nat. Hist., 

 2nd Series. Vol. XX (1857), p. 405. PI. X, figs. 11, 12 ; 

 and PL XI, figs. 12, 13. 



Body broad in proportion to its length ; posterior margin of 

 cepbalotborax very much arcbed. Anterior antennae ratber 

 longer tban tbe cepbalotborax. Anterior angle of tbe last tho- 

 racic segment rounded. Fiftb feet sbort, composed of a single 

 brancb ; in tbe male subcbelate. Caudal segments very long and 

 slender, about nine times as long as broad and nearly equal in 

 lengtb to tbe abdomen. Terminal setae sborter tban tbe caudal 

 segments. Colour brown. Lengtb ^-th of an incb. 



Tbe exceedingly long and slender caudal segments (fig. 7), 

 which bear a slender spine on tbeir outer margin at about one 

 fourtb of tbeir lengtb from tbe apex, tbe strongly arcbed dorsal 

 outline, and tbe absence of spines on tbe inferior angles of tbe 

 cepbalotborax, sufficiently distinguisb tbis from every otber spe- 

 cies. Tbe fiftb foot of tbe female (fig. 10) is very sbort, composed 

 of tbree cylindrical joints, tbe last of wbicb is armed witb four 

 sbort spines, two at tbe apex and two at tbe sides. Tbat of tbe 

 male (figs. 8, 9) is also sbort, and consists of one four-jointed 

 brancb, tbe antepenultimate being produced into a strong spine 

 wbicb, wben in apposition witb tbe apical joint, forms a prebensile 

 claw. Tbis is developed mucb more fully on tbe left tban on 

 tbe rigbt side. Tbe antero-inferior angle of tbe last cephalotho- 

 racic segment is well rounded off; tbe posterior angle is directed 

 downwards and forms an obtuse angle. 



Tbis is, I tbink, tbe most abundant, and tbe most widely dis- 

 tributed of all tbe British species. It occurs often in immense 

 numbers in tidal pools, as well as in tbe open sea. Tbe following 

 are tbe localities from wbicb I bave obtained specimens : — Tbe 

 Channel Islands, Northumberland and Durham coasts, Rothesay, 

 and Shetland. Por specimens from the two last-mentioned places 

 I am indebted to tbe Rev. A. IE. Norman. 



