126 CHARLES D. SOAR AND W. WILLIAMSON ON 



*Eylais infundibulifera Koen. (PL 3, fig. 17). 



1897. Eylais infundibulifera Koenike. Abk. Nat. Ver. Bremen, 

 vol. xiv. p. 284, figs. 3-4 ; syn. E. bifurca Piers, {vide Hal- 

 bert, Ann. Nat. Hist., Ser. 7, vol. xii. p. 513). 



This is a species in which, the capacity for variation seems to 

 be marked particularly in regard to the eye plate. 



The eye capsules are nearly cylindical, the outer margin being 

 weakly convex and the inner weakly concave. The distance 

 between the capsules is about the same as the width of the 

 capsules themselves. The anterior margin of the intercapsular 

 bridge is continued into a broad ligulate process, serving for 

 muscle attachment, while the posterior margin forms a deep bay. 

 Measured from its anterior extremity to its posterior margin, the 

 intercapsular bridge is of about the same length as the capsules. 



The palpi measure up to 1-30 mm. in length, and are stoutly 

 built, the third segment very much so. Its distal flexor surface 

 projects slightly, and is covered with numerous short spines, some 

 of these being indistinctly pectinate. The fourth segment has an 

 inner row of numerous closely placed spines for the most part 

 pectinate, and an outer row of nine short spines. The fifth seg- 

 ment is rather thick and blunt at the apex, and curves well to the 

 flexor surfa,ce. 



The antero-lateral processes of the capitulum are of moderate 

 length, and are directed well backward, though they do not reach 

 so far as the base of the posterior pair. The posterolateral pro- 

 cesses are strong and curve inwards. The pharynx is of moderate 

 width, and extends beyond the postero-lateral processes. The 

 slender air sacs are shorter than the pharynx. The mouth is 

 circular and larger than that of E. extendens. The anterior portion 

 of the maxillary plate is closely covered with large pores, and the 

 antero-lateral corners are rounded. 



The female measures up to 5 mm., and the male, distinguished 

 by its funnel-shaped, genital organ, up to 4 mm. 



The species has been recorded from European and Asiatic 

 Kussia, from Hungary and Bohemia, and from Norway, Finland 

 and Germany. Within the Britannic area it has been taken at 

 a number of places in Ireland, and in England at Norfolk Broads, 

 Epping Forest, Hampton Court and in S. Devon, and N. Wales. 



