HYDRACARINA : THE GENUS EYLAIS LATR. 129 



Hitherto its distribution has been confined to Bohemia. An 

 Eylais taken in 1901 in N. Wales appears to be referable to this 

 species, which in some respects comes close to E. infundihulifera 

 and to the variation of it which Piersig called bifurca. 



Eylais wilsoni Soar. 

 1917. Soar. Journ. Q.M.C., Ser. 2, vol. xiii. p. 281, pi. xxi. 



The striking feature of this species is the absence of the 

 intercapsular bridge. As this species has been so recently 

 described, reference may be made to vol. xiii. of this Journal. 



t Eylais bisinuosa Piers. (PI. 3,' fig. 23). 



1899. Piersig. Zool. Anz., vol. xxii. p. 62, fig. 1. 



1901. E. dividuus Soar. Sc. Goss., N.S., vol. viii. p. 68. 



The name bisinuosa has not up to this time appeared among 

 those recorded as found in the Britannic area, but material taken 

 at the Norfolk Broads in 1904 appears to be referable to this 

 species. 



The eye capsules of bisinuosa are short and broad. On the 

 inner side they are much rounded, but on the outer they exhibit 

 a very weak concave surface. The bridge between the capsules 

 occupies the anterior half of the space, the posterior margin being 

 more or less straight, while the anterior margin is recessed to form 

 a deep bay. The process for muscle attachment is round and 

 large enough to slightly overlap anteriorly. 



The distal end of the flexor surface of the third segment of the 

 palpi is prominently developed, and is adorned with a group of 

 six to ten short and broad spines. The outer surface of the 

 fourth segment has four strong, smooth bristles, while the inner 

 surface has also four, one being pectinate. Distally there are five 

 or six flat pectinate spines. 



The capitulum is distinctly long and slender, with the anterior 

 end very much broader than the posterior. At the anterior end 

 there is a sharp, broad incision in the middle, where the plate is 

 somewhat elevated above the rest of the surface. The lateral 

 edges are straight and converge posteriorly, so that the elliptical 

 pharynx overlaps them. The anterior processes are not broad- 

 ened out distally, while the posterior pair are moderately so, and 



