Irish Species of Eylais. 507 
the middle of the underside of the bridge, and projects beyond 
the front margin in the shape of two round humps, one on 
each side of the middle line. This process serves for a 
muscle-attachment, such as may be found occasionally in 
most species ; it is of no importance as a specific character. 
Evidently a widespread species. I have taken it com- 
monly in the Royal Canal, Portmarnock Ponds, and in other 
places near Dublin; in the River Barrow; and in brackish 
water on the coast of County Wexford. 
Eylais Koentket, sp. n. 
This species bears some resemblance to LE. falcata, Koenike, 
but differs considerably in the details of its structure. 
Length about 3 millim.; the body is more rotund and less 
depressed than is usual in this genus. The eye-plate (fig. 2) 
measures ‘40 millim. across at the widest part, length of single 
capsule ‘21 millim. The eye-capsules are roughly quadrate 
in outline, covered with large rather diamond-shaped markings; 
anterior and outer margins weakly rounded, inner margin 
distinctly emarginate, swollen posteriorly. Bridge* con- 
necting the eye-capsules very slender, becoming gradually 
narrower towards the middle, where there is a small oval 
muscle-attachment ; about midway between this and the 
capsule on each side there is a hair-papilla. 
The capitulum (fig. 2a) measures about °60 millim. along 
the middle line of the maxillary plate; viewed from the 
front the lateral and distal margins are moderately emar- 
ginate ; the latter is curved outwards in the centre, not joined 
* The position of the bridge evidently varies ; in a less developed speci- 
men it is nearer the front margin of the eye-capsules, and the hair-papillze 
are closer to the latter. The posterior lens also is of the usual oblong 
shape. 
