PSEUDOCALANTTS. 47 



twice as long as broad, and the remainder are mostly 

 somewhat longer in proportion to their width, except 

 the last, which is very short ; the whole length of the 

 antenna beset on its outer margin with long and stout 

 hairs, those of the last five or six joints being especially 

 strong and transversely ringed. The anterior antennas 

 of the male (fig. 3) are more slender, and the joints 

 beyond the middle much longer, the 1 8th to the 24th 

 being especially slender; the organ is not nearly so 

 densely setose as in the female. The posterior 

 antennae and mouth organs do not differ materially 

 from those of the genera already described ; the pos- 

 terior footj aw (fig. 7), however, has the first two joints 

 with only three marginal setae, near the middle of each 

 joint. The swimming feet are much larger and 

 stronger in build than in the preceding species, and 

 have their terminal spines (fig. 9) beset on the inner 

 margin with large and widely separated teeth. Fifth 

 foot of the male (fig. 10) even more slender than in the 

 preceding species, the last joint bearing at the apex two 

 small terminal setae, and on its inner margin a comb- 

 like series of about nine or ten moderately long hairs. 

 Caudal segments about as long as the last abdominal 

 segment; setae nearly as long as the abdomen. 

 Colour very dark brown ; so opaque, indeed, that 

 scarcely any structure can be seen until cleared by 

 solution of potash. Length ^th of an inch (2*55 

 mm.). 



My only examples of this species were dredged in 

 a depth of fifteen fathoms, off Portincross, Ayrshire, 

 and off the south end of the Island of Bute. 



