146 The American Naturalist. [February; 
In most of these specimens, including that noticed by Dr. Traquair, 
the skulls are similar in form, although differing in minor details, and 
have a general resemblance to the South African Dicynodon and 
Oudenodon, some of them having small tusks in the maxillary bones. 
With most of these skulls parts of the skeleton have been found. 
Two or three show the position of the vertebral column and ribs, but 
up to the present no definite centra have been traced; besides this 
there is evidence of scapula, clavicle, humerus, radius, and ulna, the 
humerus having the characteristic anomodont expansion of the two 
extremities. In two specimens the ilia are preserved. These forms 
appear to be distinct from Dicynodon, and probably repro at least 
two or three species. 
Another skull presents most of the characters of Lystrosaurus, 
but has a short muzzle and no teeth. The last, and by far the most 
remarkable skull of this series, is about six inches in length, and has 
the outer surface completely covered in by bony plates, the nostrils, 
eyes, and pineal fossa being the only apertures. The chief feature of 
this skull is the extreme development of horns upon the face and 
cheeks, there being about thirty of these formidable defences varying 
from about a fourth of an inch to nearly three inches in length, 
besides some smaller bones. The dentition is pleurodont, and resem- 
bles very closely that of the living Iguana; the palate is lacertilian, 
but with the pterygoids united in front of the pterygoid vacuity. This 
skull reminds one very strongly of the living Moloch and Phrynosoma, — 
but it probably finds its nearest ally in the Pareiasawrus from the 
South African Karoo bed. The detailed description of these speci- 
mens is nearly completed and will, it is hoped, be shortly published— 
Geol. Mag., Nov., 1892. 
Cenozoic Insects.—In discussing the Rhynchophora of North 
America, Mr. S. H. Scudder refers to the variety and abundance of 
insect life during the early Cenozoic period as follows : 
“In the earlier Tertiaries we not only possess in profusion represen- 
tatives of every one of the orders of insects, but every dominating 
family type which exists to-day has been recognized in the rocks; 
even many of the families which have but a meager representation 
to-day have also been discovered, and though many extinct genera 
have been recognized, no higher groups, with a single exception oF 
two, have been founded upon extinct forms. This is one of the most 
striking facts which confronts the student of fossil insects. It is the 
more striking from the delicacy, the tenuity, and miniatures of many 
