PLATE 4o. 45*. 
Tab. 45. *. Fig. 1. A perfect specimen magnified. 
2. Another specimen of the head, more highly mag- 
nified to show the reticulated structure of the tubercles. 
FIG. 3.’ — T. 45. 
Is a very perfect specimen of the Entomolithus paradoxus 
from Dudley. The difference between the two fossils will 
be sufficiently manifest, on comparing this figure with the 
magnified one of E. derbyensis in Tab. 45. *. 
FIG. 4. — T. 45. 
ENTOMOLITHUS Monoculites ? (lunatus) testa 
marginata antice subretusa, postice lunata, cauda 
recta ; stylo elongato simplici. S. p. 
A fossil insect. Original a Moiioculus f Its shell or co- 
vering semiorbicular, depressed, marginated ; surface une- 
qual : front subretuse, or terminating in a slight, blunt sinus: 
Y 
Whether the fossil distinguished, at present, by the title of derbyensis, be 
really distinct from the E. paradoxus of Linne, we can scarcely determine. 
It differs in the form of the head, and in the tubercles on the back, which 
have not been observed in paradoxus. But it is necessary to remark, that 
all the specimens we have hitherto seen of that species, collected at Cole- 
hrookdale and Dudley, have been merely casts; and the difference noticed, 
may possibly arise from their wanting the external covering, generally pre- 
sent in our Derbyshire Entomolithus. At any rate, it was thought more 
advisable to adopt a fresh trivial name, than to use the Linnean one, while 
the least doubt remained as to the identity of these fossil insects. 
