ACONTIOPHOEUS. 69 



Genus 4. Acontiophoeus, Brady, nov. gen. 



(Solenostoma, Brady and Robertson.) 



Like ArtotroguSj except that the anterior antennae 

 are 11-jointed; the posterior, instead of a claw, have 

 two lancet-shaped apical spines, and are 4-jointed ; 

 the fifth pair of feet are 2-jointed ; the siphon longer 

 than the cephalothorax, and very slender. 



1. Acontiophoeus sgcjtatus {Brady and Robertson). PI. 



XC, figs. 1—10. 



Solenostoma scutatum, B. & R. On Marine Oopepoda taken in 

 the West of Ireland (Ann, and Mag. 

 ISTat. Hist., ser. iv, vol. xii, p. 141, 1873). 



Body subpyriform (fig. 1) ; cephalothorax broadly 

 ovate ; head united with the first thoracic somite, the 

 segment thus formed being very large and equal to 

 nearly half the entire length of the body ; abdomen of 

 the female 3- jointed, the first segment large, and com- 

 posed of two coalescent somites. Posterior angles of 

 all the body-segments rounded off", or only very 

 slightly produced. Anterior antennae (fig. 2) very 

 short, scarcely one third as long as the first segment 

 of the body, stout at the base, and gradually tapering 

 to the apex, densely clothed on the outer margin and 

 apex with long fine hairs, some of which are plumose ; 

 to the seventh joint is attached a long curved olfactory 



