1915.] von Huene, Reptiles in Cope Collection. 2 489 
curved but seem to be in two planes, the probably shorter medial part of the 
rib is straight, then comes a slight angle downwards and the rest is straight 
again. In Phytosaurus, Mystriosuchus and Rutiodon the ribs are not broad- 
ened at all and we do not yet know the thoracic ribs of Aétosaurus ferratus 
nor those of Stegomus arcuatus. So this case is still a single one in Parasu- 
chians, slightly resembling some of the turtles. | 
Dermal scutes: The back is covered with transversely long and relatively 
narrow (8 cm. broad) sculptured dermal bones. These scutes are not con- 
nected with the ribs; there is always matrix between. Their sculpture 
consists of small (about 5 mm. diameter) shallow pits near each other. 
They are arranged in a crypto-radial order with the center of radiation 
in the middle of the anterior border just above the angle of curvature 
already mentioned. The thinner posterior border is marked by a raised 
smooth and narrow strip. Each scute probably covered its anterior neigh- 
bor in overlapping that thin border, in the manner of tiles. The more 
complete one of the scutes is 25 cm. long and 8 cm. broad. 
There are still 4 other scutes, three of which belong to the tail. One 
of them (Fig. 7) on the inner side of the rib, connected by matrix with the 
left femur, is possibly one of the lateral rows of scutes of the body or possibly 
of the beginning of the tail; it is longer in axial direction than in transverse; 
the posterior border is the same as in the medial dorsal scutes; its sculpture 
consists in radially arranged pits and 
fossee, radiating from a centre at the 
broken anterior border. 
The smallest one (Fig. 8) of the three» 
remaining scutes is also a lateral one, but 
is from the tail. Except for the size it is 
similar to the one just described. 
The two other scutes, of different size, 
are of the upper medial rows of the tail 
(Fig. 9 and 10). . They are strongly 
curved. Their form is rectangular, the et Gaede ne ae 
smaller one being subquadrate, the larger era (7) scute. x +. 
one longer in transverse direction. Their ghee tee | gues tet 
posterior border is formed as in the dor- ture. x 3. 
sal scutes. Near the middle of the an- . 
terior border is a high spine-like elevation from which the sculpture radiates. 
Classification: It is difficult to say whether 7 ypothorax should be classi- 
fied with the Pseudosuchians or with the Parasuchians. The resemblance - 
of the dorsal shield with Aétosaurus is great, but Phytosawrus has a shield 
of the same form; femur and seapula go, perhaps, a little better with the | 
