168 BRITISH COPEPODA. 



3. PORCELLIDIUM viniDE (Philippi). PI. LXX, figs. 6 8. 



Thy one viridis, Philippi. Weigmann's Arcliiv, p. 190, taf. 4, 



fig. 2 (1840). 



Porcellidium dentatum, Glaus. Beitrage zur Kenntniss der Ento- 



mostraken, p. 8, pi. ii, 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 slightly pitted. Anterior antennas 

 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 a a) quadrate, dilated 

 at the extremity, and fringed with about six small 

 sharp spines ; caudal lamina (b b) also quadrate, with 

 obtuse, broad extremities, which bear four small setae 

 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 

 4^-th 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 



