lo Bolton, PalcBontology of the Manx Slates. 



To this species we would also refer Mr. Binney's 

 Nemerites monensis. The latter was stated to occur in 

 blue laminated slate at Oakhill, Braddan, and was found 

 during the cutting of the railway from Douglas to Castle- 

 town. It was described as occurring in the form of a 

 simple loop, twelve inches long and one-eighth of an inch 

 in diameter. Mr. Binney's figure agrees very closely with 

 that of P. minor figured by McCoy. 



PalcEocJiorda major McCoy. {Plate i, figs. 6, 7.) 



Worm-castings, larger than those of P. minor, occur 

 abundantly in many of the slaty grits ; they vary somewhat 

 in diameter, from three to four lines being a fair average. 

 Not infrequently the castings lie in clusters, but show few 

 traces of coiling. 



The fine cleaved slates have yielded few castings, but 

 faint shallow tracks are not rare. They are usually very 

 long, and average two lines in diameter. 



Neretites monensis of Binney was a worm-track found 

 in a blue slate. * The dimensions are not given, but the 

 worm-track was described as meandering and consisting 

 of about one hundred segments with traces of feet and 

 cirri, and terminating in an oval-shaped head. 



An examination of Binney's figure shows that the 

 segments cross the worm-casting obliquely, and that they 

 are in line with a shear structure developed in the slate. 

 Indeed, the shearing is shown by the artist to join with 

 the segments, so that the latter appear as slight dislocations 

 of the casting. The segments are clearly no part of the 

 worm-track, but have been induced by shearing, a fact 

 still further brought out in the figure by the dragging out 

 of one side of the casting along its upper loop. 



• Mr. Lamplugh writes me that this blue slate would be in a flaggy-sandy 

 series — probably a thin parting in a quarry at Mary Veg, Santon. 



