116 CHARLES D. SOAR AND W. WILLIAMSON ON 



pectinate bristles. The fourth segment has an outer row of eight 

 spines with two pectinate bristles at the distal end, and an inner 

 row of seven spines and four pectinate bristles. Apparently the 

 Kussian material is subject to a considerable degree of variability 

 in respect to the number and position of these bristles. In the 

 Irish specimens, the palpi, which may attain a length of 140 mm., 

 have the second segment with four spines towards the inner end 

 of the distal margin. The third segment has the inner corner 

 moderately developed with 8 or 9 spines, some being pectinate. 



The capitulum is rather deeply emarginate distally, and is 

 curved outwards at the centre. The lateral processes are directed 

 downwards. The large pores on the capitulum are well distributed 

 especially in the central area. 



E. unisinuata attains a length of 3-4 mm. Sex not determined 

 and life-history unknown. 



* Eylais bicornuta Halb. (PL 3, fig. 19). 

 1904. Halbert. Irish Nat., vol. xiii. p. 200, plate x. figs. 1-2. 



So far this species has only been recorded from Lough Gill in 

 Ireland, but material taken in England at Reigate and Kirton- 

 in-Lindsey and in Derbyshire can be referred to E. hicornuta. 



The intercapsular bridge is long, but it is narrower than in 

 E. gigas Piers. , to which it has some aflS.nity. The processes on the 

 anterior margin are much longer, and end bluntly ; they extend 

 directly from the margin with a deep bay between them, and are 

 not surrounded anteriorly as in gigas. The posterior emargination 

 is about one-third the length of the bridge, which has a rounded 

 prominence serving for muscle attachment near the middle. 



The palpi are about 1-42 mm. in length, and resemble those of 

 E. infundihulifera Koen, The inner corner of the third segment is 

 moderately developed and has numerous long strong spines with 

 a few pectinate ones. The proximal inner surface of the fourth 

 segment has eight or nine long spines in a row, and to correspond 

 with these on the outer surface there are about seven. 



The pharynx extends well beyond the lateral processes of the 

 capitulum. The anterior processes have a sort of angular pro- 

 jection near the centre of their posterior margin. The mandibles 

 are about 0-46 mm. in length. 



