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 the 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 the thorax is a compound depression larger than 

 the rest, indicating the presence of a corresponding projection on the 

 back. 



Among living Curculionidae 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 Curculionidag 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 Naturforscherat Bonn, 

 in September, 1835, a beautiful wing of a neuropterous 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. 

 Brongniart. 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 nearly of the 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 lines 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 



