LIST OF PUBLICATIONS. 145 
Hay, Outver P. On the nature of Edes- 
tus and related genera, with descrip- 
tions of one new genus and three new 
species. 
Proc. U. S. Nat. Mus., 37, No. 
1699, Oct. 16, 1909, pp. 43-61» 
pls. 12-15, figs. 1-7. 
In this paper there are described three 
new species of Edestus, E. crenulatus, E. 
serratus, and E. minusculus. The last 
name is applied to a species found in 
Russia. <A description, with figures, is 
given of the histology of Edestus. Addi 
tional specimens of Lissoprion ferrieri are 
described and figured, which show that 
the so-called teeth of this genus were 
coiled, as in Helicoprion. A new genus, 
Toxoprion, is founded, the type of which 
is Dean’s Edestus lecontei. The genera 
here mentioned are all defined. The last 
section of the paper is devoted to a dis- 
cussion of the nature of the objects on 
which the genera mentioned are based. 
Reasons are presented why they can 
hardly be regarded as teeth. It is be- 
lieved by the writer that these objects, 
straight, bent, or coiled, were more proba- 
bly organs of defense or attack, arranged 
along the back near the dorsal fins. 
—— On the manner of locomotion of 
the dinosaurs, especially Diplodocus, 
with remarks on the origin of the birds. 
Proc. Washington Acad. Sci., 12, 
No. 1, Feb. 15, 1910, pp. 1-25, 
1 pl., figs. 1-7. ij 
The position taken by the author of 
this paper is that the sauropodous dino- 
saurs, especially Diplodocus, did not walk 
in a mammal-like way, as usually repre- 
sented, but more as the crocodiles 
walk. In reply to Abel’s argument that 
Diplodocus walked as usually represented 
because its feet were digitigrade, Hay 
points out that the land tortoise is digiti. 
grade. Before the close of the Jurassic 
there were dinosaurs that went erect on 
their hind legs, but it is not necessary to 
suppose that their ancestors walked as 
mammals do. The origin of bipedalism 
is considered, illustrations thereof being 
drawn from certain lizards. Certain 
crocodiles attain great size, but this does 
Hay, Ouiver P.—Continued. 
being regarded as too mammal-like. The 
writer holds further that the bipedal dino- 
saurs had a more straddling gait than is 
usually supposed. It is held as not 
proved that the birdlike tracks found in 
the Connecticut Valley were not made by 
primitive dinosaur-like birds. The sauro- 
pods are regarded as the most primitive, 
and that from these sprang first the birds 
and later other groups of dinosaurs. The 
birds became bipedal because of speciali- 
zation of their wings for fleight; dinosaurs, 
because of the reduction of their fore 
limbs. Finally, bipedalism has no neces- 
sary connection with tridactylism. 
Specimens in the collections of the 
U. S. National Museum were used for 
study in the preparation of this article. 
Descriptions of eight new species 
of fossil turtles from west of the hun- 
dredth meridian. 
Proc. U. S. Nat. Mus., 38, No. 
1747, June 29, 1910, pp. 307-526, 
pls. 10-12, figs. 1-23. 
Two species of Compsemys, C. vafer, 
from Puerco or Torrejon deposits, in New 
Mexico, and C. parva, from the same re- 
gion and probably the same deposits, are 
here described. These new materials 
throw new light on the characters of the 
genus. Mesoplastra were certainly pres- 
ent and the genus is to be placed in the 
Baénide. 
Two species of the remarkable genus 
Basilemys are described, B. prxclara, from 
the Lance Creek beds of South Dakota, 
and B. nobilis, from beds of probably the 
same age in New Mexico. 
Adocus vigoratus comes from the Creta- 
ceous of New Mexico, the same beds which 
furnished B. nobilis. Alamosemys an- 
nera, not distant from the preceding 
species, was found in what probably are 
Torrejon deposits in Colorado. Hop- 
lochelys bicarinata, from the Puerco or 
Torrejon of New Mexico, is represented by 
large parts of both carapace and plastron. 
Aspideretes amnigenus is a new trionychid 
from the Lance Creek beds of South 
Dakota, and is represented by a nearly 
complete costal plate. 
not necessitate an erect gait. The entax- | KNOWLTON, FRANK H. Descriptions of 
onic structure of the feet shows that Dip- fossil plants from the Mesozoic and 
lodocus did not walk erect but rather as : 5 
adendiles apni Cenozoic of North America. I. (1) 
The author takes the position that the Two fossil chain ferns (Woodwardia) 
whole proximal end of the femur, rounded from Oregon and Wyoming. (2) A new 
out by cartilage, formed the end of that | name for Davallia tenuifolia Swartz, as 
bone and was inserted into the acetabu- 2 ‘ : 
lum, as in the crocodiles and the lizards. identified by Dawson, and Asplenium 
The thigh thus moved backward and for- tenerum Lesquereux. 
ward in an approximately horizontal 
plane. Issue is taken with von Huene as Quar. issue, Pt. 4, No. 1884, 
regards the pose of some of the Triassic Jan. 11, 1910, pp. 489-906, pls. 
dinosaurs, the position of some of these 63, 64, 
71245°—nat mus 1910——10 
Smithsonian Misc. Colls., 52, 
