1856.] SALTER LONGMYND FOSSILS. 249 



pairs of holes themselves is always the same, and a line connecting 

 them would be at right angles to their long diameter. 



The only reason I can assign for this arrangement is, that it may 

 have been determined by the current, which in the direction of the 

 dotted lines might keep the holes clear from sediment, but in a 

 contrary direction might tend to choke them. I do not know enough 

 of the habits of the recent worms to explain it more fully. 



Localities. Carding Mill, Stretton, in beds No. 3, north end of 

 Callow Hill, Little Stretton, and other places ; very common. 



Annelide tubes. PI. IV. fig. 2. 



Besides the above, which may be doubtfully referred to Worms, 

 there are occasional tracks of the Worm itself, in the form of shallow 

 furrows on the surfaces. Only a couple of these tracks, preserved 

 because of their greater sharpness, are represented in PL IV. fig. 2. 

 But on the surfaces of the slabs I saw several undulating impressed 

 lines, which I could refer to nothing else than the trails of such 

 creatures. 



Locality. Callow Hill. 



The most interesting, however, of these few fossils is one which I 

 cannot consider doubtful as belonging to a Trilobite, though differing 

 from any species yet described, and probably referable to quite a new 

 genus. I call it 



Pal^opyge Ramsayi. pi. IV. fig. 3. 



We have three or four specimens, the best of which is represented 

 in PI. IV. fig. 3. It is 2^ inches broad, and f of an inch long. Its 

 forward edge is slightly curved downwards in the middle, but is 

 otherwise nearly straight, and has an angular ridge running along its 

 whole length just within the margin. The outer angles are rounded 

 off, and the sides are a little oblique, and appear as if they had been 

 produced, for the basal edge which follows the same line as the front 

 margin is a little curved downwards as it runs to meet the side 

 (at c). 



The centre is occupied by a parabolic axis, obscurely defined by 

 furrows. It is ^ an inch broad, or nearly one-fourth of the whole 

 width, and appears to extend nearly to the basal edge. In another 

 specimen, however, it is shorter, and leaves a space 2 lines broad ; 

 but in this specimen the segment itself is somewhat broader and the 

 base more strongly ridged ; it may be the cephalic shield. 



At first, indeed, all the specimens (four or five have been collected) 

 were supposed to be the heads of a new trilobite ; and the axis (a) 

 was taken for the glabella. But the rounded outer corners (6, b) in 

 the figured specimen negative this idea ; the straight base and the 

 apparent production of the posterior angle, c, remind us most nearly, 

 among primordial fossils, of the new genus DikelocephaluSy proposed 



