INHABITING A COAL-MINE. 205 



branch of second pair of feet (fig. 7) uni- articulate, with two 

 long and equal apical and several shorter marginal setas. Third 

 and fourth pairs of feet (fig. 8) longer, but in other respects 

 nearly similar to the second ; the arrangement of the setse of the 

 inner branch is, however, slightly different ; the outer branches 

 of the second, third, and fourth pairs are three-jointed, the 

 middle joint in the second pair is, however, much shorter than 

 the others ; while in the third and fourth pairs the last two 

 joints are long and nearly equal, the first being the shortest. 

 Fifth foot laminar, composed of two segments (fig. 9), each of 

 which is fringed with long ciliated setae. Terminal abdominal 

 segments short, tail setse finely plumose, more than half the 

 length of the body. The lower border of the last abdominal 

 ring, between the two caudal segments (fig. 10), is strongly pec- 

 tinated. Eyes wanting ?. Length (exclusive of tail setae), -fs-th 

 of an inch. 



Habitat. — Eoof of the Low Main, West Cramlington Colliery, 

 near Newcastle. 



The credit of the discovery of this species is due to my friend 

 Mr. Thomas Atthey, of Gosforth, who kindly forwarded to me 

 specimens both living and mounted for the microscope. 



EXPLANATION OF PLATE. 



Fig. 1. Canthocamptus cryptorwn, female, X 120. 



Fig. 2. Superior antenna of the same, x 400. 



Fig. 3, „ ,, male, X 400. 



Fig. 4. Inferior antenna, X 400. 



Fig. 5. Lower footjaw, x 400. 



Fig. 6. Foot of first pair, x 400. 



Fig. 7. ,, second pair, x 400. 



Fig. 8. „ fourth pair, x 400. 



Fig. 9. „ fifth pair, x 400. 



Fig. 10. Last abdominal segments, x 400. 



