418 Scientific Intelligence. 
obtained by Mr. Banks, of Kington, and Messrs. Lightbody & Cockis, of 
Ludlow, show us that Pterygotus was an elongate crustacean, with a com- 
paratively small head and sessile compound eyes, few appendages, of 
which the large chelate antenne are most remarkable, being a foot long 
and only four-jointed,—the terminal joints forming a strong serrated 
claw. The large mandibles were fully six inches long; the maxille, 
either one or two pairs, with six-jointed palpi; and the great swimming 
feet consisting of six joints, of which the terminal ones were modified as 
for swimming, and the basal joints are great foliaceous expansions, which 
pearly assisted, like the joints of the legs in Limulus, in mastication, 
rom the explanations given by Mr. Huxley in the memoir above referred 
to, there is a general resemblance both in form and structure to the small 
Stomapod crustaceans, Mysis and Cuma, two minute forms, which must 
be arranged very low down in the scale of Decapod crustaceans, and which 
are also frequently ornamented with a simular sculpture to that of the 
fossils. There is even a yet greater resemblance in form to the larve of 
Lif thi 
5. On the Bone Beds of the Upper Ludlow Rock, and the base of the 
Old Red Sandstone ; by Sir R. I. Mcrcutsoy, (Proc. Brit. Assoc., Au- 
having yet been detected in more ancient strata in any part of Europe. 
the lowest course of which at Kington contains many spines of Onchus, 
wit Lingula cornea. This thin layer, and another softer one full of re- 
mains of Pterygotus and two species of Pteraspis, are surmounted by 
the blue or grey-hearted building-stone of Kington, with Pterygotus, 
