164 BRITISH OCOPEPODA. 
the male are crenulated ; so also is the anal operculum 
(fig. 14 a), the lower border of the last abdominal 
segments (6), and of the thoracic segments (fig. 12). 
Caudal segments broader than long, bearing three 
principal sete, the innermost of which is stout, and 
about half the length of the abdomen, the outer very 
much shorter. Integument thick and closely per- 
forated (fig. 15). Colour yellow, the hinder portion 
of the first segment, and the abdomen, tinged with 
brown or orange, the last thoracic and margins of 
first abdominal segment with bluish purple. Length 
geth of an inch (1 mm.). 
Apparently a very local species. On Algze near low- 
water-mark at St. Mary’s and St. Agnes (Scilly 
Islands), where it was also taken in the surface-net in 
the evening. A few specimens only amongst roots of 
Algee between tide-marks at Roundstone, Connemara. 
Sub-family 8. Porcentipunz, Boeck. 
Body much depressed; secondary branch of pos- 
terior antenna 1-jointed; mandible-palp forming a 
large setiferous lamina. Anterior foot-jaw not clawed, 
posterior forming a prehensile hand. Inner branch of 
first foot broad, 1-jointed; fifth pair forming broad 
laminar expansions; caudal segments broad and 
laminated. 
The genus Porcellidiwm is the only representative of 
this sub-family. 
