BRITISH FOSSILS. 105 



concave edge of the great penultimate joint, and curved to follow 

 the convex border of the triangular fourth joint. It is marked by a 

 strong transverse ridge. All these joints may be seen in figs. 5 and 

 13, but in a far less perfect state than in the fine specimen, fig. 13, pre- 

 sented by my young friend Mr. R. Lightbody, jun., of Ludlow. The 

 penultimate joint p is very large, nearly three inches long, and about 

 half as broad. It is oblong, with two rounded unequal lobes, and 

 deeply notched at each end (the distal notch at the end being the 

 deepest), so that the joint overlaps the proximate joints at either 

 end. The hinder margin of the joint is more convex at first, then 

 somewhat excavated, while the anterior margin is straight, or nearly 

 so : the hinder lobes at both ends are larger than the anterior 

 ones, the proximal one, which overlaps the small fifth and fourth 

 joints, being broader and rounder, and the distal one, which abuts 

 against the terminal palette, being long and narrow. 



The terminal joint (d) is very long, nearly three inches by nine- 

 tenths of an inch wide, elongato-lanceolate, but rounded at the tip, its 

 anterior margin a little convex, and plain-edged half way down, the 

 posterior slightly concave and rather strongly serrate, the serrae 

 are shallower on the anterior margin, and deepest round the tip. 



Locality. Church Hill, Leintwardine, in LOWER LUDLOW ROCK ; 

 Whitclifie, Ludlow, UPPER LUDLOW ROCK ; Kenda], Westmoreland ; 

 fragments in UPPER LUDLOW ROCK. 



J. W. S. 

 January 22, 1 859. 



[1.] H 



