166 BRITISH CGOPEPODA. 
1. PoRcELLIDIUM TENUICAUDA, Claus. Pl. LXIX, figs. 10 
—13; Pl: LXX, fee 
Porcellidium tenuicauda, Claus. SBeitrage zur Kenntniss der 
Entomostraken, 1 Heft, p. 6, 
taf. 2, figs. 10—18 (1860). 
sal ass = Die frei-lebenden Gopepoden, — 
p. 140 (1863). 
First segment not quite half the length of the body; 
caudal segments acutely pointed behind, the two toge- 
ther forming a heart-shaped lamina. Anterior antenna 
6-jointed; last two joints very short. Outer branch 
_ of the second foot only as long as the first joint of the 
inner branch. Fifth pair of feet large, triangular, 
reaching as far as the extremity of the abdomen, very 
wide at the base, acutely pointed behind, divided 
longitudinally by a rib-like, curved line; margins 
finely ciliated; a single short seta near the middle of 
the outer margin. Integument thick and marked 
with thickly-set small circular impressions. Colour 
yellowish, the central portion of the body often 
tinged with deep crimson. Length 3srd of an inch 
(1:1 mm.). 7 
Of rare occurrence. I have not seen more than 
half a dozen specimens, most of which were found 
amongst Laminarie in the west of Ireland :—Birtirbuy, 
Clifden, and Ventry Bays. One specimen dredged off 
St. Agnes (Scilly), in a depth of ten fathoms. 
