410 PALAEONTOLOGY OF ILLINOIS. 



indications of feet or other appendages; though there is near the base of each 

 segment of the mould, a short oblique impression, that may possibly have been 

 left by very small, feeble legs folded backwards. 



As this fossil shows too many segments for a larval Insect, and has not the 

 aspect of an Annelid, we are rather inclined to view it as a Myriapod. 



Locality and position : Same as preceding. 



INSEOTA. 



LEPIDOPTEEA. 



Genus PAL^OCAMPA, M. and W. 



(waAaios, ancient; xa/inij, a caterpillar.) 



Paljeocampa anthrax, M. and W. 



PI. 32, fig. 3. 



Palxocampa anthrax, Meek and Worthen, May, 1865. Proceed. Acad. Nat. Sci., 

 Philad., p. 52. 



The fossil for which the above generic name is proposed, is about 0.90 inch 

 in length, and some 0.13 inch in breadth, exclusive of the projecting tufts of 

 hairs. It is an arcuate, worm-like body, that has been divided or split length- 

 wise in breaking open the concretion in which it is enveloped ; so that it is 

 only a longitudinal section we see in looking at either half of the concretion. 

 At both extremities, and along the upper or convex side of the curve, we 

 observe densely packed tufts or fascicles of hairs individually radiating, as if 

 from small, wart-like protuberances. These hairs are straight, and about 0.30 

 inch in length. At one extremity, which appears to be the anterior, two of 

 the bundles of hairs are more radiating than the others, and directed forward. 

 The bundles distributed over the curved or dorsal side are regularly arranged, 

 and have each a general direction at right angles from the part of the arched 

 side from which they spring. At the posterior extremity there are also two 

 tufts directed backwards, the individual hairs of which are less radiating than 

 those at the other extremity. Between some of the bundles ranged along the 

 upper side, some shorter tufts are seen, which appear as if they originate in 

 another series of protuberances farther over on the other side embedded in the 

 matrix. If we suppose each of these principal bundles along the curved side, 

 and the two bundles at either end to each belong to a single segment, it would 

 make about ten or eleven segments to the entire body. 



