October, 1846.] 107 



The animals associated with the Megalonyx are, an Ursus, a 

 Bos, two species of Cervus, one or two species of Equus, and 

 several undetermined genera, all which are now in progress of 

 delineation and description for the Academy's Journal. 



Dr. Dickeson presented another relic of yet greater interest; 

 viz., the fossil os innominatum of the human subject, taken from 

 the above mentioned stratum of blue clay, and about two feet 

 below the skeletons of the Megalonyx and other extinct genera of 

 quadupeds. 



This ancient relic of our species, is that of a young man of about 

 sixteen years of age, as determined by its size and form, and by the 

 fact that the epiphyses have separated from the tuberosity of the 

 ischium, and from the crista of the ilium. Nearly all the os 

 pubis is wanting, the upper posterior part of the ileum is broken 

 away, and but half the acetabulum remains. That this bone is 

 strictly in the fossil state, is manifest from its physical characters, 

 in which it accords in every respect of color, density, &c, &c, 

 with those of the Megalonyx and other associated bones. That 

 it could not have drifted into the position in which it was found, 

 is manifest from several facts : 1. That the plateau of blue clay 

 is not appreciably acted on by those causes that produce ravines 

 in the superincumbent diluvial ; 2. That the human bone was 

 found at least two feet below three associated skeletons of the 

 Megalonyx, all which, judging from the opposition or proximity 

 of their several parts, had been quietly deposited in this locality, 

 independently of any active current or other displacing power; 

 and lastly, because there was no admixture of diluvial drift with 

 the blue clay, which latter retains its homogeneous character 

 equally in the higher part that furnished the extinct quadrupeds, and 

 in its lower part that contained the remains of man. Dr. Dicke- 

 son has announced his intention of returning, at an early period 

 of the present autumn, to resume his explorations in this prolific 

 and most interesting locality ; and it is earnestly hoped that his 

 researches may lead to a further elucidation of this important 

 question in science. 



Dr. Leidy stated that he had lately detected the existence 

 of an Entozoon in the superficial part of the extensor mus- 



