Dr. H. Woodward — A neic Eryon from the Lias. 



309 



Condition of the specimen. — The Durnbleton specimen is a natural 

 counterpart of the under-side of the carapace, carrying with it the 

 greater part of the test, and thus exposing an inner view of it and of 

 the three anterior segments of the abdomen attached to it ; the minute 

 punctate ornamentation of the surface being caused by the observer 



FlG. 2. Eryon Bichardsoni, sp. nov. Nat. size. Upper Lias : Durnbleton 

 Hill, near Beckford, Gloucestershire, a, portion of one of the antennules 

 detached ; e, scale at base of right antenna ; s, section of a broken limb 

 detached and displaced ; c, c, part of basal joints of large chelae ; ch, 

 portion of large chela on right side (the missing parts of both chelae 

 are restored in dotted lines). 



seeing the under-side of the finely tuberculated free surface, which is 

 still partly adhering to the matrix and partly to the other corresponding- 

 slab which is evidently missing. The breadth of the carapace is 

 rather greater than the length, its contour being nearly circular ; 

 the posterior border is arcuate and broadly incurved, the postero- 

 lateral border is rather contracted, and its angles slightly produced 



