THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XXXVIII. — PodoTcesaurus* holyokensis, a New Dino- 

 saur from the Triassic of the Connecticut Valley ;\ by 

 Mignon Talbot. (With Plate IV.) 



Introduction. 



In a bowlder of Triassic sandstone which the glacier car- 

 ried two or three miles, possibly, and deposited not far from 

 the site of Mount Holyoke College, the writer recently found 

 an excellently preserved skeleton of a small dinosaur the 

 length of whose body is about 18 cm . The bowlder was split 

 along the plane in which the fossil lies and part of the bones 

 are in one half and part in the other. These bones are hollow 

 and the whole framework is very light and delicate. 



As the fossil lies in the rock, most of the bones are in posi- 

 tion, or nearly so, with the exception of the skull and the tail. 

 A detached tail that probably belongs to this specimen lies a 

 few centimeters from the rest of the skeleton and near it are 

 three very thin bones that may belong to the skull (fig. 3, 

 A, B, and C ; PI. IV, fig. 3). Two of these bones are bilat- 

 erally symmetrical and one of them is broadly convex with 

 a well-defined median sulcus. They are all more or less 

 embedded in the rock and cannot be described until the rock 



* From 7ro<5cd/cj7f = swift-footed — an epithet commonly vised in speaking of 

 Achilles. 



f A paper giving a preliminary description of this fossil was read at the 

 meeting of the Paleontological Society in Pittsburgh, in December, 1910. In 

 that paper the conclusion reached was that the animal was a herbivorous 

 dinosaur : but the work of developing, which is being done at Yale Uni- 

 versity, has shown that the bone that was then described as the right fibula, 

 displaced, cannot be a fibula, and, notwithstanding its great length, it is 

 described in this paper as the pubis, in position. The bone that was 

 thought then to be two bones, the pubis lying over the ischium, is probably 

 the ischium with a well-developed ridge as is seen in Compsognathns. 

 There would be, therefore, no bone to call the postpubis and the form must 

 be removed from the herbivorous group of dinosaurs. 



Am. Jour. Sci. — Fourth Series, Vol. XXXI, No. 186.— June, 1911. 

 32 



