118 CHARLES D, SOAR AND W. WILLIAMSON ON 



face, but is well equipped with bristles, whicli are distinctly 

 pectinate though somewhat longer than those of E. setosa. The 

 proximal half of the flexor surface of the fourth segment is not 

 chitinised like the rest of the segment. The inner surface has a 

 row of eight spines, and about an equal number of short pectinate 

 bristles. The outer surface has seven longer spines. Distally 

 the fifth segment has a number of short claws. 



Like the preceding species the capitulum bears some resem- 

 blance to that of E. infundihulifera. The anterior edge is slightly 

 emarginate with corners rounded. The mouth is circular and of 

 medium size. Except for a small strip at its posterior end, 

 the surface of the capitulum is covered with large pores. The 

 antero-lateral processes are short, and not broadened out at 

 their extremities. The posterior pair are long, with their extremi- 

 ties bent upwards and inwards. The pharynx extends only 

 slightly beyond the latter and is weakly chitinised at its posterior 

 end, where it has a width about equal to that at the middle. The 

 air sacs are not so long as the pharynx and are thin. The 

 mandibles have the end of their basal member broadly rounded, 

 with a small blunt protuberance at the posterior end of the 

 flexor surface, and a deep depression on the extensor surface 

 near to the anterior end. 



The body, which is about 4-50 mm. in length, is oval in outline, 

 and has the anterior margins of its epimera fringed with hairs. 

 The first three pairs of legs are furnished with swimming hairs 

 and range from 2-50 mm. to 3' 20 mm. in length. The fourth 

 pair attain a length of 3 50 mm. So far nothing has been recorded 

 as to the male or the life-history. 



The species has been found in England at Kew Gardens, and at 

 several localities in Ireland, as well as in Norway and Sweden, 

 Bohemia and Germany. 



Eylais discreta var. stagnalis Halb. (PI. 3, fig. 14). 

 1903. E. infundihulifera var. stagnalis Halbert. Ann. Nat. 



Hist., Ser. 7, vol. xii. p. 513. 

 1911. E. discreta var. stagnalis. P. Irish Ac., vol. xxxi. (39 i), 

 p. 5. 

 This variety measures in the male up to 3 mm. and in the 

 female up to 5 mm., and was first taken near Dublin and later in 

 the " Forth " area (Scotland) and in Berkshire. 



