496 W. WILLIAMSON AND C. D. SOAR ON BRITISH HYDRACARINA : 



than the foregoing, and has six or seven strong spines round 

 the distal end and three or four round the middle. The third 

 segment is shorter and stouter, and has five or six spines round 

 the distal end and three or four round the middle. One of the 

 distal spines is more like a bristle. 



The third pair of legs has one short fine hair on the distal half 

 of extensor surface of sixth segment. The fifth segment has one 

 moderately long fine distal hair and one or two short spines 

 about midway. The fourth segment has six or seven spines of 

 varying length round the distal end and four or five round the 

 middle. The third segment has four or five spines of varying 

 length and stoutness round the distal extremity, and a similar 

 number of shorter ones round the middle. 



The sixth segment of the fourth pair of legs has two short 

 spines on the distal half. The fifth segment has two moderately 

 long fine swimming hairs and five or six short thin spines at the 

 distal end. There are six or seven short thin ones on the inner 

 edge and two short ones on the outer edge. The fourth segment 

 has five or six short spines along the inner edge and four on the 

 outer side. 



The valves of the genital area lie close up to the posterior 

 ends of the second pair of epimera and extend posteriorly beyond 

 the epimera for about one-fourth of their length. Along the 

 inner edge of the valves there are about seven pairs of hair 

 pores. The two anterior pairs of acetabula are long and narrow. 

 The posterior pair are shorter and broader. 



Lebertia insignis Neuman. 

 (Sub-gen. Pilolebertia.) 



1880. Lebertia insignis Neuman. Kgl. Sv. Vet. Akad. HandL, 



xvii. (3), 68-70, pi. viii. fig. 4. 

 1906. Sig Thor, Zool. Anz., xxix. 784-790, figs. 50-53. 



Viewed from the critical standpoint from which the genus is 

 now considered, it is not to be wondered that Neuman's description, 

 written about thirty-five years ago, should treat rather differently 

 some details which recent writers have considered of some 

 moment. Any doubts, however, which might have arisen as to 

 Neuman's species can now have little force, as Sig Thor has 



