File:Bulletin - United States National Museum (1920) (19883196174).jpg

Title: Bulletin - United States National Museum
Identifier: bulletinunitedst1101920unitfo (find matches)
Year: 1877 (1870s)
Authors: United States National Museum; Smithsonian Institution; United States. Dept. of the Interior
Subjects: Science
Publisher: Washington : Smithsonian Institution Press, (etc. ); for sale by the Supt. of Docs. , U. S. Govt Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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OSTEOLOGY OF CARNIVOROUS DINOSAURS. 67 In discussing the use of the large foot on the pubis Marsh' says: The only probable use is that it served to support the body in sitting down. That some Triassic dinosaurs sat down on their ischia is proved conclusively by the impressions found in the Connecticut Ri\er sandstone. In such cases the leg was bent so as to bring the heel to the groimd. the foot of the pubes to the ground, nearly or quite under the center of gra\ity of the animal. The legs and ischia would then naturallj' aid in keep- ing the body balanced. Possibly this position was assumed habitually by these ferocious biped reptiles while lying in wait for prey. When in position (pi. 13) the pubes project forward and downward. Seen from the front they form a Y-shaped figure (pi. 11, fig.l). Their distal ex- tremities are usually found firmly coos- sified though occasionally immature in- dividuals have them separate. Above this point of contact they were separat- ed by an elongate aperture 120 mm. in length in 4734, U.S.N.M., while above this aperture they meet again forming a strong pubic symphysis. Wliere the anterior ends of the distal portion pro- ject forward there is a deep notch be- tween the pubes of opposite sides on the median line as shown in figure 1, plate 11. The same action in the present group would bring MeoMLrements of pubes of Antrodemus valens Leidy. No. 4734. U.S.N.M. No. S.367, U.S.N.M. Greatest length Greatest length of foot Greatest wid'th of foot Greatest diameter proximal end mm. 680 370 185 210 165 mm. 740 465 240 Greatest diameter at center of combine 1 shafts 180
Text Appearing After Image:
Ischium (is.).—In the United States fig. 47.—eight pums of antrodemus valens leidv. Nu National Museum collections there are three pairs of ischia that pertain to the species Antrodemus valens, all in a good state of preservation. Except for dif- ferences in size, all of these bones closely resemble one another in then- more important features. 8367, U.S.N.M. J NAT. SIZE. .4, SIDE view, i?, distal view OF COALESCED PUBES. 0, ACETABULAR BORDER; is. ISCHIAC articulation; p.p. articulation for pubic peduncle of THE ILIUM; S, suture BETWEEN DISTAL ENDS OF COALESCED PUBES. ' Dinosaurs of North America. 1S96, p. 161.

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