52 PROCEEDINGS OP THE ACADEMY OF 



of very uniform breadth or height, but it tapers very gradually towards 

 what appears to be the posterior end, where the last segment terminates in 

 three or four short, slender, spine-like appendages, directed backwards on a 

 line with the general curve of the body. The other end being broken away 

 in the only specimen yet known, the nature of the head and its appendages 

 cannot be determined. 



The entire body is distinctly articulated, and shows clearly nineteen seg- 

 ments, and part of another. The segments are of nearly uniform size, or 

 only vary from 008 to 0-10 inch in length ; the last one, however, has only a 

 breadth or height of about 03 inch, and the next about twice that. Cross- 

 ing the segments near the upper side, may be seen in the mould an undefined 

 furrow, (produced by a ridge in the fossil itself) which bends downwards 

 and then up again as it passes across from side to side of each segment. 

 Anteriorly it is less distinct and placed very near the dorsal margin, but 

 in tracing it backwards it is found to descend and become more defined, until 

 it reaches the fourth segment from the extremity ; on this it passes obliquely 

 downward to its posterior inferior corner, so as not to be seen on any of the 

 succeeding divisions behind. Below the middle of each segment, there is in 

 the mould a small prominence, evidently marking the position of a corres- 

 ponding pit in the fossil. These agree in position and appearance with the 

 spiracles or breathing apertures in the Myriapoda. We have not been able to 

 make otit very clearly, any indications of feet or other appendages ; though 

 there is near the base of each segment of the mould, a short oblique impres- 

 sion, that may possibly have been left by very small feeble legs folded back- 

 wards. 



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. 



INSECTA. 

 LEPIDOPTERA. 



Genus PALiEOCAMPA, Meek and Worthen. 

 Paljeocampa anthrax, M. & W. 



The fossil for which the above generic name is proposed, is about 0-70 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 

 lengthwise 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 con- 

 cretion. At both extremities, and along the upper or convex side of the 

 curve, we observe densely packed tufts or fascicles of hairs individually radi- 

 ating, 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 ex- 

 tremity 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 seg- 

 ments to the entire body. 



The specimen is not in a condition to show the head or feet ; yet we are 

 strongly inclined to believe from its form, and peculiar regularly arranged 

 bundles of hairs, that it is a Caterpillar. If we are right in this suggestion, 



[Mar. 



