ATTHEYELLA. 61 
little more than half the length. The basal portion 
of the fifth foot is large (fig. 16), its inner portion 
quadrilateral, the distal margin bearing six stout, 
plumose, and unequal sete; the second joint small, 
ovate, reaching as far as the extremity of the first 
joint, bearing one long and four shorter setz. In 
the male the inner branch of the second foot (fig. 
13) is modified, having a long, flexuous, lateral 
spine, while that of the third foot (fig. 14) is much 
attenuated, and of the fourth (fig. 15) quite rudi- 
mentary. The fifth pair (fig. 17) is much smaller, 
and has also a smaller number of sete. The anal 
operculum (fig. 18) is strongly spinous along its curved 
posterior margin. The caudal segments are short and 
broad, and the innermost or longest seta 1s more than 
half the length of the body of the animal. LHyes 
absent. 
This little animal inhabits the damp roof of the 
pit-workings of the low main, West Cramlington 
Colliery, near Newcastle, living amongst films of gela- 
tinous alezw. Specimens, both lving and dead, were 
kindly sent to me by Mr. Atthey, but I was not able 
to detect any eyes; nor even with the most careful 
dissection have I succeeded in getting a view of 
the mandible-palp, the existence of which, however, 
I can scarcely doubt. Apart from peculiarities of 
structure, the species has a distinct interest on account . 
of its unusual habitat; there can be no doubt, how- 
ever, that similar situations, if minutely searched, 
would disclose unsuspected forms of microscopic life. 
I have, indeed, in this same gathering seen a species 
