EXPLANATION OF PLATE 46". 
77 
Fig. 3. Limulus trilobitoides (nobis) forming the Nu- 
cleus of a nodule of Iron ore from Coalbrook 
Dale. V. I. p. 396.* (Original.) 
parently a fragment of the proboscis ; the legs are all imperfect; the 
thorax is very large, and only its inferior surface is visible, being 
exposed by the removal of the pectoral portion of tlie trunk ; this 
surface is covered with irregular indentations, which represent the 
hollow interior of a series of spinous tubercles, and verrucose pro- 
jections on the back of the thorax. 
In the centre of tlie thorax is a compound depression larger than 
the rest, indicating the presence of a corresponding projection on the 
back. 
Among living Curcnlionidse irregular tubercles and projections of 
this kind occur on the thorax of the Brachycerus apterus. 
The left Elytron only is distinctly visible, embracing with its 
margin the side of the Abdomen ; its outer surface is irregularly and 
minutely punctate. Two spinous tubercles project from near its pos- 
terior extremity, and a corresponding tubercle from the extremity of 
the right elytron. Similar spines occur on the Elytrons of Brachy- 
cerus; and of some Curculionidm of N. Holland. The abdominal 
rings are very distinct. I shall designate this Insect by the provisional 
name of Curculioides Prestvicii. 
M. Audouin exhibited at the meeting of the Naturforscher at Bonn, 
in September, 1835, a beautiful wing of a ueuropterous Insect, in a 
nodule of clay Iron stone, apparently also from the neighbourhood 
of Coalbrook Dale, which had been purchased at the sale of Park- 
inson’s collection by Mr. Mantell, and transmitted by him to M. 
Brougniart. This wing is nearly three inches long, and closely re- 
sembles that of the living Corydalis of Carolina and Pensylvania; 
it is much broader and nefirly of tlie length of the wing of a large 
Dragon Fly. 
* Several specimens of this species are in the collection of Mr. 
Wm. Anstice at Madely Wood. Our figure is taken from a cast or 
impression of the back of the animal in Iron stone, in which the 
transverse linos across the abdominal segment are not very appa- 
rent ; other specimens exhibit deep transverse flutings, externally 
resembling the separate segments of the back of a Trilobite, but 
apparently not dividing the shell into more than one abdominal 
Plate, nor admitting of flexure like the articulating segments of a 
Trilobite. 
The transverse depressions on the back of the second segment of 
