GEOLOGY OF LESMAHAGO. 53 
to the complete series of body-rings, including the ‘telson’ or terminal segment; the 
body-rings themselves lifting out from the matrix and presenting both the dorsal and the 
ventral aspect. The thoracic plate is also seen zu situ, the great swimming-feet (or 
ectognaths) attached to the head, on the centre of which last are seen the larval eye-spots 
(ocelli), and the great compound marginal eyes, with their facets as beautifully preserved 
as if it were a living Crustacean and not a remnant of a Paleozoic age. The friable 
condition of the fossil alone has prevented the possibility of obtaming the loan of it for 
delineation, but I hope to be able before the completion of this present Monograph to 
offer to the Society a fitting representation of this truly wonderful Pferygotus. 
