512 Mr. J. N. Halbert on 
River Corrib, near Galway. The following is a short descrip- 
tion based on these specimens :— 
The eye-plate is of medium size (*38 x °20 millim.). In 
the type form the anterior margin is shallowly emarginate in 
the centre ; posterior emargination deep and truucate. The 
outline, however, is very variable; one of the most marked 
aberrations is shown in fig. 7. A notable point is the strong 
sinuation of both the inner and outer margins of the eye- 
capsules. Central muscle-attachment large, semicircular in 
shape, reaching as far as or beyond the anterior margin. 
The capitulum measures *75 millim. from the apex of the 
mandibles to end of pharynx; length of maxillary plate 
-46 millim., rather deeply emarginate distally and curved 
outwards at the centre; lateral processes directed downwards, 
variable in length. Pharynx relatively broad (°23 millim.), 
sinuate on each side near the apex. 
The palps are rather long (1°40 millim.) ; second segment 
with four spines towards the inner end of the distal margin ; 
third with the inner corner moderately developed, with 8 or 9 
stout spines; some of these are feathered. 
Eylais spinipons, Sig Thor. 
1897. Arch. Natury. Christian. vol. xx. p. 9. 
1899. Ibid. vol. xxi. pl. xvii. fig. 164. 
The eye-plate (fig. 8) measures about °38 millim. across, 
length +23 millim. Anterior margin relatively straight, 
produced at centre into a two-pointed prominence, much as in 
the type form of infundibulifera, Koenike ; hinder emargina- 
tion very deep and rounded. Capitulum short and broad, 
distal margin only moderately emarginate. Air-tubes shorter 
than the pharynx ; the latter is narrow and of comparatively 
uniform breadth throughout. 
Palps stoutly built ; second segment with about 8 feathered 
spines along the distal margin; third with the inner corner 
