Emerson and Loomis — Stegomus Xovgipes. 377 



Art. XXXIY. — On Stegomus Longipes, a New Reptile from 

 the Triassic Sandstones of the Connecticut Valley / by B. K. 

 Emerson and F. B. Loomis. (With Plate XXII.) 



In spite of the great abundance of tracks preserved in the 

 Triassic sandstones of the Connecticut valley indicating a rich 

 land fauna, the number of osseous remains is limited to three 

 dinosaur specimens and a portion of an Aetosaurus-like cara- 

 pace, called by Marsh, Stegomus*. On account of this rarity, 

 the appearance of a new fossil throwing light on the land 

 fauna, and on the makers of the well known tracks, is of general 

 interest. 



Some seven years ago, while removing the superficial layers 

 of sandstone in the Hines Quarry, which is about a mile east 

 of the village of East Longmeadow, Mass., Mr. Gr. B. Robinson 

 found the small lizard-like specimen which is the subject of 

 this paper. It occurred in a dense layer of red sandstone some 

 ten feet below the surface and immediately above the thicker 

 and softer layers which are used commercially for building 

 stone. The discoverer removed the blocks containing the ani- 

 mal to his door yard, where they remained for about seven 

 years exposed to the weather. They were seen by Mr. and 

 Mrs. E. D. White, who obtained possession of them and brought 

 the fossil to Springfield. Mr. and Mrs. White kindly placed 

 this finely preserved fossil at our disposal for study and descrip- 

 tion. 



The specimen consists of three pieces containing the major 

 part of the whole animal. All but a thin interrupted film of 

 the bone has been leached out, leaving spaces which are filled 

 with calcite. It is, then, largely a cast, both the upper and 

 lower surfaces of the bone being impressed on one block or 

 the other. The first block contains most of the fossil, the 

 splitting having exposed the under surface of the bones roof- 

 ing the head, of the carapace from the head to the pelvis (28 

 pairs of plates), the bones of the right arm and left foot. The 

 second block contains the impression of the upper surface of 

 the same parts. The third is a chip, flaked off just in front of 

 the pelvis and exposing the vertebrae of that region. 



Skull. — This is broadly triangular in outline, tapering to a 

 pointed snout. The upper surface of the cranium seems to 

 have been completely roofed with bone, except possibly directly 

 over the orbit. Two supraorbital bones are distinctly indicated, 

 but between them and the frontals is a space which seems to 

 have been open (see '( in fig. 2, PI. XXII). Sutures are present 



* Marsh, O. C, 1896, this Journal (4), ii, pp. 59-62. 



