HYDRACARINA : THE GENUS EYLAIS LATR. 117 



Eyiais celtica Halb. (PI. 3, fig. 12). 



1903; Halbert. Ann. Nat. Hist., Ser. 7, vol. xii. p. 514, fig. 10. 

 1911. P. Irish Ac, vol. xxxi. (39 i) p. 8, pi. 1, fig. 4. 



This Irish species, found in Ballynahinch Lake in Connemara, 

 measures about 4 mm. in length, and has a relatively large 

 epimeral area. 



The whole eye plate is very large, the intercapsular bridge 

 being almost as long as the capsules themselves. The posterior 

 margin of the bridge is slightly concave, while the anterior 

 margin is produced into a blunt median point. The eye 

 capsules are much wider in their anterior portion than in the 

 posterior, while the inner and outer margins are sinuate. The 

 hair pores on the inner anterior corner of the capsules are slightly 

 behind the narrow chitinous strip between the median process for 

 muscle attachment and the eye capsules. 



The palpi resemble those of E. infundibulifera. The second 

 segment has four or five spines on the inner distal margin, and four 

 pectinate spines at the distal inner corner. The third segment 

 has the distal portion of the flexor surface moderately developed ; 

 there are about twenty long spines, many of which are pectinate. 

 The fourth segment has the proximal half of the inner surface 

 crowded with long bristles and the outer surface with a row of nine 

 or ten similar long ones. 



The capitulum measures about 0-55 mm. and also resembles 

 that of E. infundibulifera. The postero-lateral processes are 

 short and curved inwards at their apices. The pharynx is long 

 and narrow, and the air sacs reach near to the pharyngeal ridge. 



Eylais discreta Koen. (PI. 3, fig. 13). 

 1897. Koenike. Ahh. Natur. Ver. Bremen, vol. xiv. p. 286, fig. 6. 



The intercapsular bridge is short and broad. Its anterior 

 edge extends only very slightly beyond the eye capsules, and is 

 more or less weakly toothed. The posterior edge bounds a deep 

 V-shaped bay which extends in between the capsules for about 

 half their length. 



The palpi are about 1*20 mm. in length, and are stout, resembling 

 E. setosa in its bristle armature. The third segment is almost 

 devoid of any protuberance at the anterior end of its flexor sur- 



