RESTORATION OF DIADECTES 
He €CASE 
University of Michigan, Ann Arbor, Mich. 
In 190s the writer published in the Journal of Geology (Vol. XIII, 
No. 2) a description and discussion of the genus Dzadectes Cope, 
based on several specimens forming part of the collection of the 
University of Chicago, and especially upon specimen No. 1075. More 
prolonged study and the discovery of several additional specimens 
make it possible to attempt a restoration. It is unfortunate that the 
species to which this specimen belongs cannot be determined. The 
specific characterization of members of this genus has been made 
entirely upon the teeth, and in this specimen the jaws are so tightly 
closed that their form cannot be made out. The only parts of the 
restoration not based upon No. 1075 are the feet, the distal ends of 
the lower-limb bones, the exact form of the posterior lumbar ribs, 
and the number of the caudal vertebrae. The form and proportions 
of the lower-limb bones have been determined from other specimens, 
and the shortness of the tail has been verified. The general character 
and proportions of the feet are also known from other specimens, as 
is the exact shape of many of the bones composing them; it is 
probable that the feet are somewhat too small in the restoration. 
The restoration is one-sixth natural size; the animal, it is thus 
seen, was not far from three feet, six inches in length. This is by no 
means the largest representative of the genus, since another specimen 
known to the writer is nearly one-third larger. 
The skull is relatively large and clumsy, set closely on the heavy 
spinal column, with practically no neck. It is noticeable that the 
heavy lower jaws hang as low as the sternum, giving the animal a 
bodily habit strikingly like that of the Stegocephalia. The vertebral 
column is very heavy, and its vertebrae are closely interlocked. The 
ribs are broad and heavy in the thoracic region, and are found on all 
the presacral vertebrae, even the atlas. No abdominal ribs have 
been found in any specimen of the genus, nor of the related genus 
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