168 BRITISH COPEPODA, 
3. PORCELLIDIUM VIRIDE (Philippr). Pl. LXX, figs. 6—8, 
Thyone viridis, Philippi. Weigmann’s Archiv, p. 190, taf. 4, 
fig. 2 (1840). 
Porcellidium dentatum, Claus. Beitrage zur Kenntniss der Ento- 
mostraken, p. 8, pl. i, figs. 19 
—-22 (1860). 
—_ — _— Die frei-lebenden Copep., p: 140 
(1863). : 
Body very broadly oval, width equal to three fourths 
of the length, not at all attenuated behind, more or 
less truncated in front, especially in the male; in- 
tegument only shghtly pitted. Anterior antennz 
4-jointed, with coalescent second, third, and fourth 
joints. Last thoracic segment proportionately much 
broader and less elongated than in the two preceding 
species; fifth pair of feet (fig. 8 aa) quadrate, dilated 
at the extremity, and fringed with about six small 
sharp spines; caudal lamine (bd) also quadrate, with 
obtuse, broad extremities, which bear four small sete 
at the outer and two at the inner angles. In the 
male these plates project somewhat beyond the apices 
of the fifth feet. Colour greenish yellow. Length 
oth of an inch (‘63 mm.). 
Found in the same situations as the preceding, and 
equally, if not more, abundant. The list of localities 
given for P. fimbriatum applies accurately to the 
present species. 
There seems little reason to doubt the identity of this 
species with Phillppi’s Thyone viridis ; the serration of 
the lower border of the fifth foot is very distinctly 
marked in that author’s figure, and I do not know any 
