430 ME. G. S. BBADY ON 



0. spinifrons ? Boeck (1864), Oversigt Norges Copep., p. 25. 



Taken occasionally in the surface-net. Plentifully off Sunder- 

 land, August, 1871. Frith of Forth, Whitby, and Bridlington, 

 in gatherings made by Mr. E. C. Davison. 



Boeck's description of 0. spinifrons seems to me not to indi- 

 cate any essential difference between it and 0. helgolandica, 

 Claus, the chief point being the presence of a minute rostrum in 

 the Norwegian specimens, which is not noted in Claus's definition. 

 This, however, might be easily overlooked. I have seen it in 

 some of my examples, but have not succeeded in bringing it into 

 view in others, and should, in fact, have probably missed it 

 altogether, had it not been for M. Boeck's description. 



Genus BOECKIA, nov. gen. 



Like Cyclopina in general appearance. Superior antennae very 

 short, six -jointed, much shorter than cephalothorax. (Mouth 

 organs totally different from those of any of the allied genera). 

 Swimming feet like those of Cyclops, but very short and broad. 

 Fifth pair of feet one-jointed, laminar, spinous. Abdomen much 

 elongated ; tail setae short, ovisacs two. 



1. BOECKIA ARENICOLA, 110V. Sp. 



Second joint of superior antennae the longest, three times as 

 long as broad; fourth and fifth joints of equal length, two-thirds 

 as long as the second; sixth joint scarcely as long as the pre- 

 ceding, third the shortest of all, about one-fourth as long as the 

 second. Inferior antennas short and thick, three-jointed, with- 

 out any secondary branch, densely beset with rather short and 

 stout setae. Swimming feet having the marginal angles of the 

 inner branch much produced ; margins densely and finely cili- 

 ated ; lateral spines of the outer branch lanceolate, laminar ; 

 the basal joint fringed with a row of somewhat similar, but much 

 smaller spines in pectinate series. Feet of fifth pair consisting 

 of a single slightly curved, club-shaped joint, having on its outer 

 margin one long spiniform seta with two minute ones near its 



