45 10 Proceedings of the Royal Irish Academy. 



*W. pygmaea (Scott). — Ballynakill, 1-2 fms., 1901, one. Blacksod Bay, 

 between tide-marks and in 2 fms., September, 1911, several. 



*W. monensis (Brady). — Ballynakill, in stomach of white trout, 1901, one. 

 Clew Bay, 18 fms., August, 1910, one. 

 W. SATTJRNI. n. sp. (PL I, figs. 1-4).— Female (PI. I, fig. 1), length, -8 mm. 

 Body short and stout, but not so robust as in W. nohilis ; abdomen bent 

 sharply backwards, about half as long as the cephalothorax, slightly 

 tapered ; caudal rami broad and short ; 2nd caudal seta from the inside 

 markedly thickened at the base. 1st antenna (PI. I, fig. 2) short, 

 six-jointed, the terminal part consisting of three joints; proportional 



length of joints, '''' • Other cephalic appendages as in 



W. nohilis. 1st pair of feet (PL I, fig. 4) with endopodite about two 

 and a half times as long as the exopodite. Outer edge seta of 1st joint 

 of endopodite not reaching to the end of the joint, inner terminal claw 

 about three times as long as the outer ; exopodite two-jointed, 1st joint 

 with one outer-edge spine, 2nd joint with three outer-edge spines, the 

 middle one being very small, one terminal spine and one terminal seta. 

 5th pair of feet (PL I, fig. 3) almost as in W. nohilis, except that the 

 innermost seta on the endopodite is proportionately much shorter. 

 Colour, yellow. 



Two specimens dredged in Fahy Bay, Ballynakill, in H fms., February, 

 1901. 



This species agrees in size with W. nohilis, but differs in the jointing 

 of the 1st antenna, the two-jointed exopodite of the first feet, and the 

 length of the setae on the 5th feet. It agrees with W. (Pseudothalestris) 

 imhricata Scott, from Ceylon, in most respects, differing in its larger size 

 and in the presence of a small additional outer-edge seta on the second 

 joint of the exopodite of the first feet and in the absence of an inner-edge 

 seta on the same joint. 



Family LIOSACCIDAE. 



Diosaccus tenuicornis (Cls.). — Clifden and Westport Bays (B. & E.). 

 Ballynakill, 1901-2, frequent. Inishlyre Eoads, Clew Bay, to 18 fms., 

 and Blacksod Bay, between tide-marks and 18 fms., frequent. 



AMPHIASCUS VARICOLOR n. sp. (PL II, figs. 1-8 ; PL III, figs. 1, 2).— 

 Female (PL III, figs. 1, 2), length 1-05 mm. Body of the usual Amphiascus 

 form, moderately slender, with well-developed rostrum ending bluntly in 

 dorsal view. Anal segment a little shorter than the preceding one. Caudal 

 rami short, about as wide as long, and widely separated. Caudal setae 



