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 setae; the second joint small, 

 ovate, reaching as far as the extremity of the first 

 joint, bearing one long and four shorter setae. 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 setae. 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 is more than 

 half the length of the body of the animal. Byes 

 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 algae. Specimens, both living 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 



